Theory Gym
Theory Gym is made and published by Jacob Naparstek. AppBrain is an independent app data site and isn't affiliated with Jacob Naparstek. The app name, icon, screenshots and description belong to Jacob Naparstek and are shown as published on the App Store.
AppBrain's verdict
- Last updated
- September 28, 2026
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Releases
Updates seen on the App Store- Version
- 1.1.1
- Launched
- January 2026
No changelog data
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Technology
Found in the app by AppBrain- Price
- $3.99
- App size
- 11.1 MB
- Content rating
- Everyone
Technologies used by Theory Gym
About the app and developer
About Theory Gym
Theory Gym is an education app developed by Jacob Naparstek.
What is the rating of Theory Gym?
Theory Gym has no ratings yet.
Is Theory Gym free?
Theory Gym costs $3.99. The app size is 11.13 MB. The latest version available is 1.1.1. The last update was on September 28, 2026.
What are the requirements for Theory Gym?
The app has a content rating of Everyone. The app has been available on the App Store since January 2026.
Developer information for Jacob Naparstek
Address:
Frequently asked questions about Theory Gym
Is Theory Gym free?
No. Theory Gym costs $3.99 on the App Store.
Is Theory Gym still available?
Yes. Theory Gym is on the App Store, and the last update we saw was on September 28, 2026.
How large is Theory Gym?
Theory Gym is 11.13 MB.
Is Theory Gym suitable for children?
App Store rates the content of Theory Gym as suitable for everyone.
Who made Theory Gym?
Theory Gym was developed by Jacob Naparstek. It is listed in the education category on the App Store.
Store listing
By Jacob Naparstek, from the App Store
Description by Jacob Naparstek Written by the developer, not by AppBrain. Click to read.
Theory Gym is a voice-first music theory trainer built for real fluency: fast mental recall, accurate spelling, and measurable progress.
Music teachers often recommend “mental reps” to make theory automatic—Theory Gym turns those reps into quick, guided workouts with instant feedback and progress tracking.
Three voice-powered workouts:
1) Interval Discovery
Given a start note + interval, say the target note.
Example: C + m3 → Eb
2) Chord Spelling
Given a chord name, spell the chord tones in order.
Example: Dm7 → D F A C
3) Scale Spelling
Given a scale name, spell the scale notes in order.
Example: G Major → G A B …
Why it works -
Live feedback (so you don’t rehearse mistakes)
Speed tracking over time (see your time-to-solve drop as you improve)
Built for consistency: quick sessions you can actually sustain
Notes -
Voice-only experience (requires microphone permission)
English only (for now) — optimized for spoken note names plus “sharp/flat”