---
title: "Theory Gym - Reviews, Revenue and Downloads in Germany | Apple App Store"
description: "Understand music — not just memorize shapes.  Theory Gym is a voice-first music theory trainer built for real fluency: fast mental recall, accurate spelling, and measurable progress.  Music teachers o"
---

# Theory Gym — Germany

![Theory Gym App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/c3/06/0b/c3060b2c-dfb6-0aae-01ae-2bde7e300aca/AppIcon-0-0-1x_U007epad-0-1-0-85-220.png/434x0w.png)

**Developer:** [Jacob Naparstek](https://apptail.io/developer/jacob-naparstek-Mjl)
**Category:** Education
**Rating:** N/A (0 ratings)
**Price:** €3.99
**Bundle ID:** com.jacob.lab.MusicJym
**Store:** Apple App Store
**Country:** Germany
**Version:** 1.1.1 (released 2026-09-28)
**Original Release:** 2026-01-21
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/de/app/app/id6753793635)
**AppTail Page:** [https://apptail.io/app/theory-gym-IrjA/germany](https://apptail.io/app/theory-gym-IrjA/germany)

## Theory Gym Description
Understand music — not just memorize shapes.

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”

## Theory Gym Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/9c/9f/26/9c9f265f-aba2-911b-c6bc-288b545fd0ea/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-01-18_at_14.08.45_2.png/1242x2688.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/96/78/86/9678867a-52d1-af25-1a1e-95d685d9d373/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-01-18_at_14.08.50_1.png/1242x2688.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/e9/26/bf/e926bf9c-a486-5b5f-eed9-dd6eb9d68056/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-01-18_at_14.12.10_1.png/1242x2688.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/91/6a/91/916a9132-ac30-7b7a-9876-33d014dd246e/simulator_screenshot_0316D3AB-769E-41A3-8CBA-7024B9811860_1.png/1242x2688.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/79/b6/4b/79b64b11-c6c6-e5c7-0bbf-3ce42fa48a7a/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-01-18_at_14.11.04_2.png/1242x2688.png)
- [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/88/6a/b3/886ab361-de0f-710f-fc10-d67df785574a/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-01-18_at_14.11.17_2.png/1242x2688.png)
- [Screenshot 7](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/63/da/a5/63daa545-e27d-3683-a905-605c43b58206/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-01-18_at_14.11.13_1.png/1242x2688.png)
- [Screenshot 8](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/11/b4/1b/11b41b42-d53d-9cc8-e0d4-f4fdc1146fb6/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-01-18_at_14.10.45_2.png/1242x2688.png)






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## Theory Gym Available In
- [Germany](https://apptail.io/app/theory-gym-IrjA/germany)
- [United Kingdom](https://apptail.io/app/theory-gym-IrjA/united-kingdom)
- [New Zealand](https://apptail.io/app/theory-gym-IrjA/new-zealand)
- [United States](https://apptail.io/app/theory-gym-IrjA/united-states)
- [South Africa](https://apptail.io/app/theory-gym-IrjA/south-africa)

---

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