Tuner vs ARN Metro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Tuner
This application provides precise instrument tuning capabilities. It assists musicians in achieving accurate pitches for their instruments.
- Precise instrument tuning
- Achieve accurate pitches
- Supports various instruments
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Tuner lets you tune your instruments with precision.
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: Tuner at Free against ARN Metro's $2.99. ARN Metro's advantage is update cadence (every 3 weeks vs every 14 months) and iOS requirement (17.0 vs 26.0). On ads, 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
Tuner is free to download; ARN Metro costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Tuner ships an update every 14 months, ARN Metro every 3 weeks. The most recent releases landed on October 25, 2026 and October 18, 2026 respectively.
| Parameter | Tuner | ARN Metro |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | 4.5 (214 ratings) — better | — |
| Positive reviews | 51.6% of reviews | — |
| Number of ratings | 214 — better | — |
| Update frequency | Every 14 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone | iPhone, Apple Watch — better |
| Requires iOS | 26.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Julian Boehm-Tettelbach | Nicolas Augsburger Rossi |
Bugs and requests
Tuner
Reported bugs
4 issues- Advertisement for another app does not disappear even after download
- App causes iPhone to crash or freeze
- Screen freezes with blue spots
- App causes phenomenal bugs, not recommended
Requested features
7 requests- Allow changing reference frequency (440, 442, baroque, etc.)
- Option to select instrument (e.g., French horn)
- Ability to switch between sharps and flats
- Show octave of the note
- Microtonal tuning options (24TET, cent modifier)
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- Just intonation option
- Option to turn off metronome app pop-up
ARN Metro
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Tuner
No in-app purchases
ARN Metro
No in-app purchases
