- Universal App, purchase once, available on all iOS devices
- Precise to ±1/1000 semitone (±0.1 cent)
- Tuning Range from C0 to B8, covering the range of almost all musical instruments
- Well-designed "Fixed" note wheel display
- Tone generator
- Line-in and Built-in Microphone Modes
- Optimized for iPhone 6 and iPhone 6 Plus
- Supported both Landscape mode
- Strobe Tuning Mode
- Fine Tuning Mode with a highly responsive tuning meter for perfect tuning
- Historical Curve Mode that shows tuning results over time
- FFT Tuning Mode for frequency analysis with Log, Linear or Note Display options
- Real-time Spectrogram Mode with Log, Linear, Note and Median Frequency Display options for real-time audio analysis
- Adjustable A4 (Concert A) calibration in 0.1 Hz increments
- >30 historical temperaments
- Customizable temperaments
- 12 notations
- Needle damping
- Customizable transposition options for transposing instruments
- Tone generator with four wave forms
- Customizable Input Channels
- Supported Apogee One
- Supported Inter-App Audio
- Supported Audio Bus
- iPod Touch 3rd generation requires an external microphone.