Zero: Fasting & Health Tracker Reviews

Then the pandemic happened and I stress ate my way through. Now there’s a vaccine coming and I want to get back on track again. I highly recommend Zero for weight loss, health, energy, anti-aging, etc. I wish I’d known YEARS AGO that fasting was healthy and a real way to stay healthy and fit. We were lied to fir decades, but it’s not too late to take control of our bodies and health!

I tried a lot of apps for fasting and this is the most flexible. You can edit your start time after starting the fast so if you forgot to start Zero , but remembered to fast, you’re all set. It has some scheduled routines and a lot of freestyle, so lets you do you. Notifications are inspiring as it shows how many other people are fasting. You can eat a wider variety of foods if you fast regularly with far less negative impact on your weight and health. I don’t feel like a failure or dread coming back to this. I got anew iPhone and it triggered me to get going again. I’m really excited! Join me in a fast today!

I’m 47. I was about 40 pounds overweight, five days ago. Now I’m only 30 pounds overweight. I’ve alternated between the 16:8 and 18:6 fasts and been a diet Nazi on myself. I’ve switched to a Mediterranean diet, and probably eat between 1,000 and 1,500 calories a day (I don’t keep an exact count, and that’s just a rough estimate.) Basically, I’m eating about half of what I normally do in food, and have cut out all alcohol and nighttime snacking. Have tried to walk/jog about a half mile a day and run around the yard more with my 5-year-old. I imagine if I exercise harder, I’ll turbo boost this process even more. On a scale of 1-10, my hunger pangs while fasting have sometimes hit about a 5. But it’s totally manageable and takes just a little bit of discipline. With Zero’s countdown timer, it’s easier to hang in for the last hour or two, because the end is in sight. And when you do eat, you want to eat as healthy as possible so you don’t feel like the fast was for nothing.
My beer belly’s days are numbered.

I’ve been on a calorie restricted diet for years making very slow progress on my weight loss goal. I decided to start recording the time of my last food each day knowing that the time you eat may be as important as how much you eat. It quickly became a burden and a clutter on my calendar so I went looking for an intermittent fasting app. Since my original interest was just recording the time of my last meal I wanted a simple low/no cost app. I found only one free app that didn’t have in-app purchases to goof up features. this app was that app plus it had the bonus of a 4.9 rating. To my surprise this is a full featured app with a very high quality UI . It has historical tracking of your fasts and can read or write to Apple Health. Zero had so much IF learning information that I began a 16:8 schedule. I’m only on day 4 but my progress has improved while keeping exactly the same calorie goal. No matter what your needs to track IF or TRF you are in for a treat with a professional app to assist you.

I’ve been intermittent fasting for about 2 years on and off. When I’m fasting, I find it extremely motivating to track my taste on this app. I love that it has a few of the standard preset fasting times, but more recently I’ve been using the custom fasts which is an excellent feature. I’ve been back and forth on the 16-8 and 20-4 fasts so I set my custom to 17 hrs at the moment knowing I can build my way back up to 20 hrs. When I was regularly fasting and tracking on this app consistently for about 3 months, I lost 15 lbs pretty effortlessly. I’ve fallen off the wagon a few times but I’m back on now and am exciting to keep tracking. The UI is really beautiful and easy and I love that it automatically updates my weight from my Bluetooth scale through the Health app. The only update I’d like to see is to have a more interactive view with the recent fasts feature. I feel like this page could be more helpful. Overall, 100% recommended to anyone looking for an IF tracker.

I have been using the this app app since March of 2019 and have found Zero very useful to reach my health and other goals that I have. The developers keep improving Zero in many useful ways such as improving journaling, adding more knowledge to the learn feature and improving the stability and function overall. If you are wanting to track your first fast, look no further my friends this is Zero to get. Also be sure to check out their Oak meditation app, it is amazing.
One suggestion: I would love to see new features on the Apple Watch. For example have the fast tab show up on the Apple Watch that way I can quickly select the fast that I need.

Also if you could please add the Oak app to the Apple Watch and have the ability to select and download a meditation or breathe to the Apple Watch. This would be awesome to have while away from my phone, that way I can put on my AirPods and do a quick mediation or breathe session while on break or lunch.
Thanks for the hard work.

I have been using Zero for the past year or so (intermittently, pun intended), and must say ur is by far my favorite health app overall. Part of why I like this app so much is its gradual development of new and useful features, while keeping the interface minimal and functional. I never struggle to find settings, and their UI design updates never leave me feeling lost about where anything is, due to the simplistic and functional fast-tracker homepage. Unlike other fasting trackers I have tried in the past, this app is more concerned with supporting a healthy lifestyle as opposed to just fasting, with regular check-ins on weight and goal-setting. As a student, I find the pro subscription a bit on the high-end, although I do feel like they offer a lot of content and features for it. I hope that they offer a discounted version in the future, but for now, I am also extremely satisfied with all of the free features that come with Zero .

Zero is simple to use. Very intuitive. I only have the free version and I don’t get hounded by adds which is great. I don’t mind paying for Apps- I just basically refuse to pay subscriptions. I tried a few apps for fasting together and I didn’t like the others nearly as much as this one. I love that you can just hit a button to start a fast and another one to edit your start or stop time (meaning if I ate 30 mins ago but didn’t mark my fast as ending).

The other apps were way to ridged. They would make you schedule all fasts for the week then would even automatically start and stop them. That’s not how my life works. I can’t eat and fast at the exact same second every day. That’s why I love this app. It isn’t annoying. Doesn’t make you hate yourself if you break a fast lol. It’s just a great simple tool there to HELP you. Not there to overpower and run your entire schedule

My daughter turned me onto Zero. She’s followed Peter Attia for a long time. I really like the functionality, and the videos in the articles are great. I signed up for the coach portion because I really wanted to see the statistics. I’m two weeks in and learning how to fast suit me best as well as what is making for better weight loss for me. There was an initial questionnaire, and all the coaching seems to be based off of that with no way to modify or change preferences. The modifications week to week in the fasting regimes are minor but I want to add a couple of 18 to 20 hour fast in my week, and Zero doesn’t allows me to do that. I could just do it and log it, but I get a lot of motivation about having the timer. I’m also doing over 110 hours in fasting, even if I’m not making my 16 hour goal every single day because I’m doing longer fasts some days, but then for the next week the coach recommends a 80 hour fast regime with options that don’t have much variety to them. Very frustrating given the cost of Zero .

Great app. I’d love for a few different functionalities. 1... the calendar(and notifications) to be more functional for scheduling different lengths of fast for the week in advance because the biggest thing is I forget to think about what time it is and when my fast will begin/end. Sometimes I’ll forget that it’s 30 minutes until my fast end time and I have to make food and then eat which pushes me past the cutoff. I want to automate more of my fasting schedule. 3 days i fast for 16:8 and 2 days I will fast closer to a 20:4. 2... you’re gamifying fasting, which is good, but this is problematic when we cannot schedule cheat days or a clearer way to incorporate random schedule changes into the dietary restrictions. There are certain days that I know my eating schedule won’t follow a normal fasting pattern but I can’t indicate that in Zero in any way so it ends up looking like I had a 24 hour eating period or something like that. It’s messing up the data and usefulness.

I have been using the original this app app for approximately a year now and love it. Just as is, the original is a fantastic app for tracking fasts. It also has graphs available to show your progress as well as the ability to log weight and other health info which you can sync to other apps (optional, of course). BUT NOW... WOW!! I’m on day 3 of the free trial of the new ZeroPlus and it’s amazing!! It will break down your fast in real time and describes in detail what stage you’re in with a detailed account of what your body is doing at that time. There are tons of other new features with the PLUS as well. I love the “Learn” center and it’s large amount of science-backed information on fasting as well as exercise, different diets, recipes, just to name a few! I’m still learning all the new features for I’ve only scratched the surface. But I will definitely be purchasing ZeroPlus once my trial is over. Highly recommend!!

I am a premium subscriber and I absolutely loved Zero until the last update, which took all of the coaching features out of Zero - which is why I purchased the premium subscription in the first place. It used to suggest a weekly plan of 5 fasts of varying lengths to do each week and you simply had to get in the hours around your schedule on the flu. All that is gone and now the plans are the same fast every day and it wants you to plot out your own schedule for the entire week down to the minute and figure all this mess out for yourself. Heck, I don’t know my schedule for tomorrow most days, much less a schedule for an entire week! Zero isn’t even providing any coaching any longer. It’s all a big complicated figure-it-out yourself mess that I don’t want to deal with. I’m probably going to drop my premium subscription at this point and just use it as a timer, because this app took away all the features that I paid for. It’s not worth the money now.

I’ve tried countless diets and none of them ever felt good. I have severe anxiety and major difficulties with memory and would get torn between eating out with friends or sacrificing my diet, both options sending me into an attack. Until I found Intermittent Fasting. It’s the first time I’ve felt truly free and in full control of my eating, with the added bonus of giving me tons of energy. And there’s no way I would’ve been able to lose as much weight (20 pounds in less than two months!!) without this incredible app. It’s simple, efficient, sends beautifully easy notifications, and even has a dark mode. Zero shows you how many people are fasting with you, has options for the different kinds of fasts, helpful information, and much more. If you’re even remotely curious about weight loss, control over eating, or IF at all, you need Zero. It costs a whole 0 dollars, so why not give it a shot?

I love Zero. Very informative and helpful when it comes to health. I’ve been fasting for a while and having gotten Zero makes the process much more enjoyable and educational.

Previously, I had an issue where Zero wouldn’t update the settings I had left for the notifications I wanted. It was very frustrating and annoying for me. I left a detailed review about the error and within about a week the developers fixed the issue and left me a response. Thank you so much to the team of developers who worked on the issue.

Since then, Zero has only gotten better and better. The this app team is adding more educational content and adding new features that enhance the user experience.

My favorite most recently added feature is the change in fasting zones. The this app app now allows you to add a little bit of information regarding your lifestyle. Based on your lifestyle the fasting zones change. I’m currently on the ketogenic diet to lose wait and the change in fasting zones is very motivating for me. I also love the charts that this app displays. For example I can see a trend line that compares my weight loss/gain in front of a bar graph that shows how long I’ve been fasting. Zero is really amazing and is helping me meet my weight goals. Thank you so much for the great work and please keep the great content coming!!!

I first learned about the new subscription level on this app from the Tim Ferris Show. I was excited to check it out because the free version has been a daily part of my life for over a year now. I’m more than happy to play a bit of money to an organization that adds so much value in my life.

The addition stats and content library is amazing and help me validate in my mind I am doing the right thing for my health when so many naysayers think the idea of not eating for long periods of time are crazy.

For all the folks complaining about being offered a chance to access to more information at a cost, think about how you get paid. You provide a service to someone else and that puts money in your account. How do expect app developers to operate any differently. And, at a subscription rate at less than $3 a month, they certainly aren’t taking advantage of anyone.

The science behind weight loss is not fasting. That is a health myth that has been promoted by individuals trying to sell you a fast weight loss plan. When you do loose weight over a period of a week by fasting you are loosing “water weight” which is fat that is easily dissolved with the restriction of calories. Which would be great if it wasn’t a type of fat that comes back easily with drinking water. A lot of the programs say that it must be a total fast, where you don’t consume anything, no food or liquids, playing into the idea a couple of sentences back.

This also denies the idea that people need to learn how to eat healthy on a regular basis. Fasting for weight loss is great for models and fighters that must go down a weight threshold to have a better weight in the short term, but is ineffective for the average person as as soon as the person is not restricted by the fasting app there has been no subconscious push to indulge again. And this usually is met with a rebound, and more weight gain for the person in question.

In summary Zero is trying to scam you into being completely dependent on it and wants you to fail with no plan B.

However plus just doesn’t do it for me. I’m already a pretty healthy fellar... I’m fasting fir autophagy and Zero just doesn’t provide enough value for me. Lots of great info from the experts, like it like it like it. However what I’m going for there isn’t wnough information out there to privide the type of value I’m looking for. Will be going with the free version after my trial. And personally even if I was trying to lose weight the features probably wouldn’t do it for me. There is good info but most of it just seems like weight mongering(which is the typical marketing for weight-loss related strategies) But I think the price is steep. Overall great app concept, but there needs to me more value even before i’d consider paying that price for Zero . I understand a profit needs to be turned but we broke. However I really like Zero and will continue to use it and I’m happy to help the creator make money thru advertising. 4 stars!

I just love Zero. I chose the 16/8 fast and Zero makes it so easy to fast. It will tell you the ending time based on when you start your fast whatever time that is and whenever I feel like breaking my fast before the time I look at how much time I have fasted and how much time I have left and just drink some fasting tea or bone broth and keep doing it!! I also placed reminders to let me know when I had gone halfway or to just check in to see how I am feeling while fasting. I love how it has the tracking that lets you know how many days you have fasted and the badges given for the days you have fasted. My next one will be the 25 day one and it is coming fast. After that is the 50 day then the 100 day and so on. It will be a great since of accomplishment to meet all of those goals, all thanks to Zero. I love it!! Thank you so much!!!

Absolutely thrilled at the mental result of my first fast which is literally minutes away from being over. The 15th hour got very hard. I made some black coffee which I hate and drank it and now I’m almost done and it did suppress my appetite and I did get over that hump. I made a commitment to myself and I stuck it through and that’s huge for me and that’s why I’m doing this. For self-discipline. To prove to myself that I can. The rest of the benefits are just a plus that I happily will relish in. I started the seven day free trial scoffing at the idea that I would ever pay nearly $70 a year for Zero but intending to get a lot of use out of the seven days no doubt. Just minutes away from my fast ending my first one that I’m actually truly intentional and committed to, that $70 ain’t looking like a lot right now and I’m definitely contemplating taking this lifestyle more seriously.

One of my favorite apps. I used it all the time for my fasting journal. I just got done deleting it after the new version forces you to login your personal information… Not something anyone wants! I kept declining and every time I declined it would refuse to allow me to set the timeframe in custom fasting option. If I did not allow notifications it also prevented me from doing a custom fasting option. it now tries to link you through Facebook etc. All the different options that you added cannot outweigh the fact that you’re definitely mining for more information on your customers and this is a deal breaker. I’m not going to be forced to give my information and allow notifications when I don’t want them. The old version I just entered what time I started, what time it ended and it worked fine now I have to go look for another app or some other means of tracking my progress for fasting. Whoever came up with this so Called upgrade needs to have their head examined. People do not like being forced into corners where they have to allow notifications and or give their personal information!!!!

There is so much value I Zero: valuable information, lot of features that are useful and I recommend this for people who are serious about intermittent fasting. Nevertheless, I am deleting Zero because I am apparently too stupid to use the timer. My plan is 13 hour fasting where I fast starting at sundown and break my fast in the morning. In the morning I stop the timer. A couple of hours later I check the timer, and it still shows me fasting. I have a week of 20 plus hours of fasting recorded when I have never done more than 16 max. At first I thought the fault was mine: I forgot to turn off the timer. But no, I have turned of the timer, and several hours later it’s ticking away. My fasting records are now a mess, so I am going to start using a clock and a pencil and paper. Far less frustrating for my simple mind.

Fasting is like meditation for me - really difficult habits to stick with. Zero has helped keep me motivated through the tough times, through the periods of hunger that would have made me give up in the past. I love the visual aspect of the timer, the prompts to force me to check-in on how I am feeling, the data, and the articles and virtual "support" peeps. Zero has made visible times of the day that give me the most trouble and tips from other users have helped me deal with them. The bottom line is that the fasting has created a stepped improvement in my energy levels which has carried over into my work productivity and relationships with friends and family and coworkers. I eat when I get home at 4pm and end up making much healthier food choices (food has never tasted so good after a 20+ hour fast). This has become the too App that I engage with throughout my day.

The previous version of Zero had a much more refined UI. I gave the previous version 5-stars while I give the current version 3-stars.

This version is still functional, and it provides more information. That said, the current UI is unnecessarily busy and lacks simple but powerful elements of the previous version.

One of these elements is when a person reached their goal the whole UI would change from the red to green. While this is a seemingly simple thing, it had a powerful effect on my experience. With the current version, I no longer get the satisfaction from glancing at Zero during my day following reaching my goal nor do I get the resultant motivation to keep pushing on beyond my minimum goal.

Another example is the interface for initiating my fasts. The previous version of the interface was more simple and in my experience more inviting to initiate a fast. For me, it was actually a small joy to press start on the previous version. Now I am faced with several pieces of unnecessary data surrounding the start button. It fees more like a chore than a pleasure now. There is too much noise surrounding the experience I am seeking

I really value Zero, and I believe it can help people. I hope these deteriorations and others are addressed and not worsened. The first version was so much closer to nailing it

I was introduced to Zero by when I started intermittent fasting. Zero takes all the guess work out of figuring what time to break or start fasting. I needed flexibility so that I don’t have to stick to an exact time every day. When your ready to fast you press start fasting and it will indicate the time you will need to break your fast based on which fast you choose. You can also customize the type of fast that you want. Zero also lets you know how much time you have gone over past the scheduled fast if you don’t break when your scheduled to. Whenever I have my last meal then I press fasting and the count down begins. Even if I stop eating at 2 o’clock in the morning Zero will tell me the next time I need to break my fast. Zero is extremely helpful and has been so useful in my journey with intermittent fasting.

About Zero or about fasting in general, go for it.
Zero is a very well designed helper with first time fasters. If you cut yourself off, and forget to start the clock, you can edit the start and stop times by tapping the corresponding number on the screen. If you forget to start Zero - or that you intended to fast at all, (hello me) there is a gentle reminder shows up on your lock screen.
Overall, I started a 16/8 and feel amazing, AND I’m cutting out (yikes!) thousands of calories I’m not eating in the evening. I’ve been starting around 4p and although Zero congratulates me for completing at 8am, I go for a few more hours. I’ve found I’ve lost weight, but most of all I have more energy, I don’t crash midday. Yes, at night I feel my stomach whining for food, but I know if I get thru it, I will feel great in the morning.
Try fasting, try Zero.

First started using this app in November 2018. Zero was less tricked out then. But I lost 48 pounds and this app came along for the ride. Really helpful. After a while fasting became so natural that I gravitated away from this app. Unrelated to this, I started putting on the pounds again after managing to keep the weight off for a whole year. Just yesterday downloaded this app again (love what you did with the place), set me a 24 hour fast and, whereas in recent weeks I really struggled on my own to even skip dinner, somehow a stupid app helped put me on the right path again. Just completed my first 24 hour fast, about to embark on a second one today (probably risky but I want fast results). Anyway. Awesome app. Something about that nice orange timer that help lock down that commitment. Can’t explain it. Thanks to the whole development team though!

I follow a keto diet and lifestyle and eat in an 8 hour window. this app helps me track my 16 hour fasts. You can create a custom fast time period and then press Begin Fast when you’re done eating for the day. When you meet your goal, an alert pops up to let you know you have been successful. I am VERY grateful for this alert because I would probably forget to eat otherwise. My appetite has really diminished on keto, and since I’m a First Responder, I can’t risk rushing off to a emergency and suddenly realizing I’m famished and haven’t eaten in 20 hours (it’s happened and it SUCKZ). this app helps me remember that I’ve given my body a rest from digestion and it’s time to refuel for the day’s adventures. I simply get my meal 🥓🥦🍳🥑☕️, press End Fast, and chow down. After dinner I just repeat the same steps.
So simple and so effective 👍🏼

I love Zero. And never had an issue with until yesterday. I haven’t been able to basically use Zero . I’m giving one star only because when I click app support there’s no way to tell them about a bug. So hopefully they see this!!

What’s happening is Zero is having a really hard time starting/ ending a fast, changing a fast, and keeps kicking me out of my account. I hit end fast and it’s saving them with an incorrect time and type of fast. For example: I ended my 13 hour fast that started at 8:25 but then saying I have ended a 18:6 fast while having a 18:6 fast still on going from 10 pm. And while I can edit the times from the journey section I can’t edit the type of fast. Gave 1/5.

Edit: With the new update everything was fixed!! Thank you so much! Now a 4/5 because I’m unsure if they improved how to report bugs.

I absolutely love Zero , however I would like to recommend adding in the ability to make your custom fasts longer than 24 hours. Specifically for those people who love doing longer fasts, such as 36, 48 and 72 hours. I myself am a big advocate of longer fasting, however the moment I got my iPhone, I knew I wanted Zero. The sunset counter is amazing and Zero is beautiful. But again, I’d love to be able to track and be notified of fasts longer than 24 hours. Seeing the pop up say that my fast is up is the most satisfying feeling in the world. Thank you for such an amazing app and keep up the good work!

EDIT: This review was typed up BEFORE the 3.0 update. Zero literally because the BEST fasting app on the market as soon as they allowed the custom fasts that go as long as 7 days. 😎

Very easy to use which I love in an app. Shows you how long you have left down to the seconds, minutes and hours. Shows you how long it’s been since you last fasted. Keeps record of how you feel when you’re done with a fast, or you can simply skip that. Also if you break a fast early you can keep it recorded or delete that fast. Has a history of how many fasts you’ve done and if you reached the time goal for those fasts and how far you reached on those time goals. Very easy and fluid and beautiful interface. Easily the best fast tracking app that I’ve used. Also shows how many people are fasting at any current moment! 385k are fasting using Zero today which is incredible. Thanks creators! Love Zero

Previous version did what it did and did it perfectly — no bloat, no issues. Now? Boy. Slow to open, interface is overdesigned and inconsistent, you need an account (and to agree to the customary sure-to-get-worse-over-time-once-selling-your-data-becomes-lucrative privacy policy) just to use the thing, and occasionally things like notifications just don’t work. Why do I need to know that 85,000 other people are fasting right now? I don’t, certainly not if it means Zero is slow to load every single time I open it. This isn’t a social network, it’s a utility. Would rather have paid for the previous version of Zero than get this trojan horse for free. Sticking with it for now, if only because the watch app hasn’t been mucked with (yet), but I’m also looking around for alternatives, which I never felt any need to do before this update. this app version 2 seemed too good to be true — free, polished, no strings attached — and I guess it was.

I really liked Zero when I started using it last week. I like being able to track my progress with my fasting and it’s exciting to see that I make it each day. However, Zero kicked me out today and I was unable to log back in. I thought I had signed in with my google account originally, but when I logged on that way, it signed me up for a new account. So I tried my regular email address I use for these types of things, and Supposedly I was putting my password in wrong, but I tried the reset password button several times, and it never worked. After messing with this for an hour and a half, I finally gave up and signed in again under the gmail so I could get Zero working again. Sadly all my progress recorded is lost. :( if this happens again, I’m done with Zero and re-rate at 1-star. Hopefully this was just a one time glitch.

What else can you ask for? Zero was created people focused from 2 men. One with the idea of how to bring this idea to life and one with the savvy background of how to build and manage a successful application. The two together started on this endeavor to create what you see now.
The flexibility of fasting times are a must for me, which Zero has focused on.
It’s all about options and how to incorporate a healthier lifestyle into your way of life.
Some things to keep in mind: all diets are lifestyles and are not meant to be a short term fix for a long term problem.
The concept of fasting goes back to our primordial days where food was scarce and people ate in binges- which goes to show that the body can withstand long periods of not eating and still maintain health.
Recent studies have shown the health benefits of maintaining a regimen of fasting and I encourage you to read up on the articles that have been posted through this application.
I also enjoy the fact that all the data syncs seamlessly into other health apps, like Apple Health. Other apps don’t have the capability to do that yet.
In conclusion, if you want a healthier lifestyle, you can’t go wrong with the “this app” app.