VoiceTools will help you adjust your pitch. That’s cool, and if that’s what you want to do* then go for it.
But first, is that really your goal? Cuz I’m betting you’re after what I am: sounding more like a cis woman.
Here’s the problem... Pitch won’t do that. Many cis women have lower pitch voices. Likewise, many men have higher voices. Do you get them confused? No. That’s because the primary identifier has little if anything to do with pitch on its own and EVERYTHING to do with RESONANCE.
Actually, if we want to get technical then it’s to do with the ratio of the first resonance (R1) to the pitch. However high or low a cis-woman’s pitch (or “fundamental frequency”) is, the gap between it and their first resonance is going to be larger than a cis-man’s.
Voice apps can measure both of these and more, but for some reason most of them focus unhelpfully on pitch. MORE unhelpful is the implication apps like this one present that somehow your voice will sound more fem if you can raise your pitch. Eh. Not much, and it’s a lot of work and can actually hurt your vocal folds if strained too far too fast - a point VoiceTools makes no mention of.
I would recommend reaching out to your trans communities for resources on legit apps and freely shadowable voice lessons. I am in a few Discord servers where this is done with helpful diagrams, apps, and extraordinary vocal coaches demonstrating and giving feedback.