Common Charts vs Number System Trainer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Common Charts
Read full descriptionHide full description
Common Charts helps worship leaders and musicians bring chord charts into one clean, flexible library for rehearsal and live performance. Import songs from Planning Center, plain text, or PDF chord charts, then organize them into setlists and perform with tools built for real services. Common Charts makes it easy to clean up charts, transpose keys, and keep lyrics and chords readable on stage. Terms of Use: https://commoncharts.30twelve.org/terms Privacy Policy: https://commoncharts.30twelve.org/privacy
Number System Trainer
Learn and master the Nashville Number System for music. This app offers interactive modules to help musicians of all levels understand chord progressions, transpose songs, and improve their ear training. It's designed for quick learning and on-the-fly musical communication.
- Interactive learning modules
- Chord reading and identification
- Instant transposition
- Ear training exercises
- Visual chord shapes
- Circle of 4ths & 5ths reference
Read full descriptionHide full description
Number System Trainer teaches you the Nashville Number System — the method worship musicians and session players use to learn songs fast, transpose on the fly, and communicate with any musician in any key. Whether you're a beginner who only knows 3 chords or an experienced worship leader, this app meets you where you are. 6 INTERACTIVE MODULES • Learn — A 5-step intro to how the number system works • Read Charts — 4 levels from basic chords to slash chords • Transpose — Move full progressions to any key instantly • Ear Training — 3 levels, identify chords just by listening • Play Along — See piano and guitar shapes in every key, with capo tips built in • Circle of 4ths & 5ths — Tap any key to see all 7 chords No login required. Works instantly.
Screenshots
Verdict
The clearest difference is in-app purchases: Number System Trainer at none against Common Charts's 2. On price, update cadence, ads 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
Both are free to download. Common Charts sells 2 in-app purchases, starting at $9.99 per month. Number System Trainer asks for nothing beyond the download.
Common Charts ships an update every 9 days, Number System Trainer weekly. The most recent releases landed on September 9, 2026 and September 14, 2026 respectively.
| Parameter | Common Charts | Number System Trainer |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (10 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 10 — better |
| Update frequency | Every 9 days | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 45 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Tim Morgan | Brandon Oaks |
In-app purchases
Common Charts
- Common Charts Plus Monthly$9.991 Month
- Common Charts Plus Yearly$99.991 Year
Number System Trainer
No in-app purchases
Questions
Is Common Charts free?
Is Number System Trainer free?
Do Common Charts or Number System Trainer have ads?
Which is updated more often, Common Charts or Number System Trainer?
Other comparisons
