ChromTuner

Overview

ChromTuner is a small suite of tuning tools: a configurable native Mac tuner, plus free browser and iPhone editions. It is best suited to musicians who want detailed tuning options on macOS, while the free versions cover simpler checks. The Mac app’s broad tuning controls are compelling, but its microphone is a poor choice for loud rehearsals.

Key features

Mac tuning controls

The Mac app detects pitches from A0 to C8 with YIN and reports ±1 cent accuracy in real-world use. Four displays—LED meter, Peterson-style strobe, vintage needle and drifting sine wave—let players choose how they read pitch. Fifteen instrument presets, eight historical temperaments, adjustable capo, custom A4 reference and transposition up to 11 semitones in either direction make this a more flexible option than a basic chromatic tuner. It does not offer intonation monitoring, so players seeking that assessment should look elsewhere.

Metronome and audio input

A separate-window metronome provides 40–240 BPM, tap tempo and meters from 2/4 to 7/8. The Mac app accepts its built-in microphone or macOS-recognized USB interfaces and Aggregate Devices through Core Audio, including interfaces from Focusrite, Universal Audio, MOTU and RME. That wired input route is useful for studio and home setups; in full-band rehearsals or on noisy stages, room-microphone tuning can be unreliable, and the maker recommends a wired pickup or interface DI input.

Privacy and support

The maker says the Mac app processes microphone audio in memory, does not record or transmit it, and makes no outbound network connections. It is described as sandboxed under macOS App Sandbox and Hardened Runtime, with a Privacy Manifest and no telemetry. Those are meaningful assurances for players mindful of audio privacy. A Mac purchase includes direct email support from the developer, with FAQ replies usually arriving within a few hours.

Pricing

The browser tuner is free forever and includes chromatic tuning, an LED meter and browser microphone input. It is a straightforward choice for occasional checks, but it does not include the broader Mac controls.

The free iPhone app is also free forever, with no ads, account or subscription. It includes chromatic, Standard E and Drop D tuning, an LED meter and analog needle, a metronome, and string tracking for one instrument. At $6.99, paid once, ChromTuner for iPhone Pro unlocks all 17 presets, extra displays, string tracking for all instruments, historical temperaments, capo and transpose. The one-time price suits players who need those extra controls without a recurring subscription; the free tier remains useful if its preset and single-instrument limits suffice.

Chromatic Tuner for macOS costs $6.99, paid once, with lifetime 1.x updates. It is a universal binary for Apple Silicon and Intel, sold under a personal, single-user license, and requires macOS 14 Sonoma or later. This is the fullest option, but the single-user terms and minimum macOS version matter for shared setups and older Macs. There is no free trial.

Platforms

ChromTuner is available for macOS, iPhone and web. The iPhone app requires iOS 17 or later; its included standalone Apple Watch app requires watchOS 11 or later. There is no iPad-native version of the iPhone app, so iPad users should not count on a dedicated edition.

Who it's for

ChromTuner is a strong fit for Mac-using musicians who value multiple pitch displays, historical temperaments, alternate tuning controls and wired audio input. The free browser and iPhone versions suit players who want basic tuning without a purchase, while iPhone Pro is for those who need more presets and string tracking across instruments. It is less suitable for noisy-stage use with only a room microphone, or for iPad users seeking a native app.

Pros and cons

• Extensive Mac tuning choices: four displays, 15 presets and eight historical temperaments serve players who need more than standard chromatic tuning.
• Wired input support: Core Audio support for recognized USB interfaces and Aggregate Devices offers an alternative to the built-in microphone.
• Clear one-time pricing: the Mac and Pro iPhone editions do not require subscriptions.
• Free entry points: browser and iPhone editions cover basic tuning without ads or an account on iPhone.
• Noise limits microphone reliability: room-mic tuning may falter in full-band rehearsals and noisy stages.
• Platform constraints: the Mac app requires macOS 14 or later, and there is no iPad-native iPhone edition.
• No intonation monitoring: players who need that function will need another tool.

Alternatives

GuitarTuner.io is a free web tuner with no account or paid upgrade required, and it also spans Android, iOS, macOS and Windows; choose it if broad platform coverage matters more than ChromTuner’s Mac-specific controls.

Centerline offers free chromatic tuning across 62–800 Hz, four display views and guitar mode with six guitar views, plus a 3.99 USD one-time Complete plan. It is worth comparing if its stated range and guitar-focused views fit your needs.

Pro Guitar Tuner provides a free app with tuning presets and custom tuning options, with premium features on a monthly plan at custom pricing.

Bandmate Chromatic Tuner is free on Android, iOS and web, with no third-party ads.

Fender Tune is a free Android and iOS tuner app; Tune Plus requires a Fender account.

GuitarTunePro offers a free core tuner with no signup, subscription or ads on Android, iOS and web.

insTuner has a free iOS and macOS edition with Instant-Tuning Mode and a tone generator.

JustATuner is another option for Linux, macOS and Windows.

Browse more options in Musical Tuner Apps.

Verdict

Choose ChromTuner if you use a recent Mac and want a one-time purchase tuner with multiple displays, historical temperaments and support for wired audio interfaces. Its free browser and iPhone editions make basic tuning accessible without paying. Look elsewhere if you need intonation monitoring, an iPad-native app or dependable room-microphone tuning in noisy settings.