Composer Pro vs ARN Metro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Composer Pro
Compose music scores with ease using a familiar keyboard layout. This app supports multiple parts, a wide range of instruments, and various musical symbols, making it suitable for both beginners and experienced musicians.
- Keyboard-style note input
- Support for up to 8 parts
- Over 100 instruments
- Variety of music symbols
- Configurable parts and settings
- Instrument transposition
- Export without watermark
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A handy sheet music writer app, make writing sheet music feels like typing notes. Tap on the keys with notation in a familiar keyboard layout. Provide a very easy way to compose music score. Support up to 8 parts, over 100 instruments, variety of music symbols and notations. It is very friendly for rookies while professional enough for experts. --------------------------------- UNLIMITED ACCESS SUBSCRIPTION - Support up to 8 parts - Config parts(add, delete, reorder) - Change key for each part - Change beat type and tempo - Config clef for each staff - Config sound for each part - No watermark image export - No Ads - Support 2nd voice part - Transpose instruments - Change keyboard size - Import data file - Unlock all 100+ instruments - The subscriptions are $9.99 monthly and $49.99 yearly with free trial - Payment will be charged to iTunes Account at confirmation of purchase - Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period - Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal - Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase - Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that service, where applicable - Terms of use: https://service.notationpad.com/terms_service.html
ARN Metro
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ARN Metro-Tuner brings two essential tools for musicians to your Apple Watch: a haptic metronome and a chromatic tuner. METRONOME Feel every beat through the Taptic Engine. Set your tempo from 20 to 220 BPM using the Digital Crown or tap the TAP button in rhythm to detect your tempo automatically. Choose 1 to 7 beats per measure (1/4 to 7/4) and enable the downbeat accent for a stronger haptic on beat 1. When you change the BPM mid-playback, the phase is preserved — the rhythm doesn't restart from zero. CHROMATIC TUNER Play a note and see it immediately: note name, octave, and cents deviation on a clear visual indicator. The tuner uses the YIN algorithm for accurate pitch detection across the full range of guitar, bass, violin, and voice (25–2000 Hz). When the note enters the in-tune zone (±5 cents), the Watch vibrates — you can tune without looking at the screen. SETTINGS • A4 reference from 415 to 446 Hz — adjust with the Digital Crown or choose from 8 presets (415, 432, 435, 440, 442, 443, 444, 446) • Mic sensitivity: Low, Medium, High • Downbeat accent: on/off Everything runs on Apple Watch — no iPhone needed during use. An extended runtime session keeps the metronome and tuner alive throughout your practice session. User manual available in English at www.arn-music.ch
Screenshots
Verdict
The clearest difference is price: Composer Pro at Free against ARN Metro's $2.99. Composer Pro also leads on iOS requirement (15.0 vs 17.0). ARN Metro's advantage is in-app purchases (none vs 4) and update cadence (every 3 weeks vs every 2 months). On 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
Composer Pro is free to download; ARN Metro costs $2.99 up front. Composer Pro sells 4 in-app purchases, starting at $6.99 per 7 days. ARN Metro asks for nothing beyond the download.
Composer Pro ships an update every 2 months, ARN Metro every 3 weeks. The most recent releases landed on October 29, 2026 and October 18, 2026 respectively.
| Parameter | Composer Pro | ARN Metro |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | 4.5 (695 ratings) — better | — |
| Positive reviews | 71.5% of reviews | — |
| Number of ratings | 695 — better | — |
| Update frequency | Every 2 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Subscription | — |
| Devices | iPhone, iPad, iPod — better | iPhone, Apple Watch |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 161 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | 嵩 张 | Nicolas Augsburger Rossi |
Bugs and requests
Composer Pro
Reported bugs
3 issues- Notes sometimes placed incorrectly
- Measures and compositions randomly deleted
- Inability to restore deleted content
Requested features
5 requests- Add more instruments beyond piano
- Allow changing time signatures and key signatures without subscription
- Improve note editing and placement
- Add export options to save/share compositions
- Provide more music notation tools and dynamics
ARN Metro
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Composer Pro
- Unlimited Access$6.997 Days
- Pro Access$9.991 Month
- Pro Access$49.991 Year
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- Pro Access7 Days trial$49.991 Year
ARN Metro
No in-app purchases









