# Sustain: Practice Spotter — Monitor and log your practice.

> Monitor and log your practice. (iPhone/iPad app by Nathan MacDonald.)

- Source: https://appshunter.io/ios/app/sustain-practice-spotter/id6777862733 (this page in markdown: same URL + `.md`)
- Developer: [Nathan MacDonald](https://appshunter.io/developer/6777862735)
- Category: Productivity, Music
- Price: Free
- Age rating: 4+
- Requires: iOS 17.6 · 82 MB
- Languages: American English
- Released: 2026-06-24
- Data updated: 2026-08-13
- User reviews in markdown: https://appshunter.io/ios/app/sustain-practice-spotter/id6777862733/reviews.md

## What is Sustain?

Practice Spotter is an app that uses machine learning to detect when a musician is practicing, and provides feedback on their practice sessions. The app is designed to help musicians of all levels improve their practice habits and achieve their musical goals.

Features
- Watches for instrument presence (AI object detection).
- Listens for instrument sound (AI sound classification).
- Rewards practice points while the instrument is seen and heard.
- Displays encouragements while you practice.
- Logs your practice sessions.

Usage
1. Position your phone or tablet such that the front camera captures your entire instrument and your entire upper body (head, arms, hands) in view. We recommend mounting your device on a tripod or to a music stand. No visual or audio data is uploaded from your device (see https://www.atomopolis.com/privacy_sustain.html).
2. In the Settings menu, select your instrument and practice session duration.
3. Close the menu and click the start button.
4. Progress is measured only while you actively practice.

Future Features
- Rewards for streaks (consecutive days practiced) and cumulative time practiced.
- Additional spotter faces.
- Leaderboards or leagues.
- Practice quality feedback (intonation, tone quality).


## Version history (last 5 releases)

### 1.4.7+13 — 2026-08-09

Bug fix: Ensure interactive tutorial automatically starts for first-time users.

### 1.4.5+11 — 2026-07-17

Enhancement: Added Debussy spotter animation by popular request.

### 1.3.4+9 — 2026-07-12

Bug Fix: Audio gauge now only reacts when detecting music.

### 1.2.4+8 — 2026-07-02

BUG FIX: Set XCode Strip Style = Non-Global Symbols to avoid "Failed to lookup symbol 'TfLiteModelCreateFromFile': ... symbol not found"., which prevented loading TFlite model for sound detection.

### 1.2.3+7 — 2026-06-30

Enhancement: Updated YOLO OBB model.

## Related topics

[practice space app](https://appshunter.io/ios/topics/practice-space-app) · [my practice app](https://appshunter.io/ios/topics/my-practice-app)

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-13.*