Keys Trainer vs NoteTrace
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Keys Trainer
Master key signatures and scales with this music learning app. Practice identifying keys, understanding note sharps/flats, and instantly recognizing scale layouts on a keyboard. Features include customizable practice, passive viewing, and a challenging game mode.
- Key signature recognition
- Scale layout identification
- Customizable learning range
- Intelligent training based on performance
- Practice, View, Game, and Search modes
- Earn coins, medals, and trophies
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Do you want to be capable of recognizing the key signatures at first sight? That is, when you see a key signature, you know what key it is and what notes should be sharp or flat immediately. Do you want to have the ability of instantly identifying the scale layout on a piano/keyboard for a given key? If your answer is yes, check out this app. It can help you acquire these skills which can definitely benefit your music learning and piano playing. Main Features: • Practice Mode You learn at your own pace simply by answering the question, and if you are wrong, the correct answer will be shown for the duration of your choice. • View Mode You don’t need to do anything but watching, the questions and answers will be shown automatically after the delay of your choice. Good for lazy people like me. • Game Mode In this exciting countdown mode, you can challenge yourself and earn as many coins, medals, and trophies as you can. • Search Mode This mode allows you to look up the keys by name, key signature or keyboard. • Learning Range Customization You can customize your learning range sot that you can focus on improving your weaknesses. • Intelligent Training Each question is generated intelligently based on the statistical information of your performance so that it can turn your weaknesses into strengths.
NoteTrace
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Every note you play flows across the staff. The app listens through your microphone and shows the note you're playing on a musical staff. The staff scrolls to the right, so your playing leaves a visible trail behind it. ■ What it does ・Shows the note you're playing on the staff, with its name ・Displays how far off the pitch is, in cents ・Colors the trail: green when in tune, orange when sharp, blue when flat ・Switches between treble, bass, and alto clefs ・Adjusts the reference pitch (415–443 Hz) ・Adjusts scroll speed and direction ■ For any instrument Strings, winds, keyboards, or voice. If it produces a single pitch, it works. The range covers low C (around 65 Hz) up through the high register. ■ Who it's for ・Anyone practicing intonation ・Anyone connecting the sound they make to its place on the staff ・Anyone checking the stability of long tones or vibrato ・Anyone who wants more than a number on a tuner ■ How to use it Open the app and it starts listening. There are no buttons to press. Allow microphone access and play. ■ Notes ・Designed for single notes. Chords and double stops are not supported. ・Audio is analyzed on your device. Nothing is recorded, stored, or sent anywhere. ・Quieter rooms give more accurate results. If it isn't picking up your sound, adjust Sensitivity in Settings.
Screenshots
Verdict
The clearest difference is price: NoteTrace at Free against Keys Trainer's $2.99. NoteTrace also leads on update cadence (every 10 days vs every 9 months). Keys Trainer's advantage is ads (none vs shown) and iOS requirement (12.0 vs 17.6). On in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
NoteTrace is free to download; Keys Trainer costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Keys Trainer ships an update every 9 months, NoteTrace every 10 days. The most recent releases landed on October 22, 2026 and October 29, 2026 respectively.
| Parameter | Keys Trainer | NoteTrace |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 9 months | Every 10 days — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 30 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Plearn LLC | SHIGETAKA NISHIDA |
In-app purchases
Keys Trainer
No in-app purchases
NoteTrace
No in-app purchases









