ChromTuner

ChromTuner is a chromatic tuner offered as a native macOS app, a free browser tuner, and a separate iPhone app. The Mac app uses YIN pitch detection across A0 to C8 and reports ±1 cent accuracy in real-world use. Players can choose an LED meter, a strobe, a vintage needle, or a drifting sine-wave display. Tuning controls include 15 instrument presets, eight historical temperaments, an adjustable capo, custom A4 reference, and transposition up to 11 semitones in either direction. A separate-window metronome supports 40–240 BPM, tap tempo, and meters from 2/4 to 7/8. Audio input works with the built-in microphone or macOS-recognized USB interfaces and Aggregate Devices through Core Audio. The maker says the Mac app processes microphone audio in memory, makes no outbound network connections, and does not record or transmit audio. The Mac version costs $6.99, paid once and requires macOS 14 Sonoma or later. No free trial is listed. The iPhone app requires iOS 17 or later, and the included Apple Watch app requires watchOS 11 or later.

ChromTuner offers several tuning displays, presets, and metronome controls, with separate browser, Mac, and iPhone options. The Mac app is a paid one-time purchase, and noisy stages can make room-microphone tuning unreliable.

ChromTuner may suit musicians who want tuning displays and custom settings on a Mac, or a free browser or iPhone option. The Mac version supports recognized USB audio interfaces as well as its built-in microphone.

Overview

ChromTuner is a set of chromatic tuning tools: a detailed native app for Mac, plus separate free browser and iPhone versions. It is best suited to musicians who want adjustable tuning references and several pitch displays on macOS, while the simpler options serve quick checks. Its main trade-off is that microphone tuning can struggle in a loud room.

Key features

Displays and tuning controls

The Mac app offers an LED meter, Peterson-style strobe, vintage needle, and drifting sine-wave display. That range makes it easier to choose a visual readout that suits the player, and the strobe adds an option beyond a conventional meter. There are 15 instrument presets, eight historical temperaments, adjustable capo, custom A4 reference, and transposition by up to 11 semitones in either direction. Alternate tunings are supported, but intonation monitoring is not.

Pitch detection uses YIN across A0 to C8, with the maker reporting ±1 cent accuracy in real-world use. That stated precision is useful for players who want a fine-grained reading, though the acoustic environment still matters.

Metronome and audio inputs

A separate-window metronome covers 40–240 BPM, includes tap tempo, and supports meters from 2/4 to 7/8. The Mac app can use its built-in microphone or macOS-recognized USB audio interfaces and Aggregate Devices through Core Audio; the maker names Focusrite, Universal Audio, MOTU, and RME among supported interfaces. A wired pickup or audio-interface DI input is the better choice for full-band rehearsals and noisy stages, where the maker warns that room-microphone tuning can be unreliable.

Privacy and support

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

Pricing

The free browser tuner costs $$0, free forever, and provides chromatic tuning, an LED meter, and browser microphone input. It is a straightforward option for occasional checks in a browser, but lacks the deeper tuning controls of the Mac app.

The free iPhone app costs $$0, 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. It suits basic mobile tuning; Pro is needed for all 17 presets, additional displays, string tracking for all instruments, historical temperaments, capo, and transpose.

ChromTuner for iPhone Pro is a $$6.99 one-time purchase with no subscription. It fits players who want the expanded controls on iPhone without an ongoing fee.

Chromatic Tuner for macOS is $$6.99 one-time, including lifetime 1.x updates. It is a personal, single-user license for macOS 14 Sonoma or later, and the universal binary supports Apple Silicon and Intel. That is the paid route for the full Mac feature set; there is no free trial.

Platforms

ChromTuner spans web, macOS, and iOS, but the versions are separate offerings rather than one identical app across devices. The iPhone app requires iOS 17 or later, and its included standalone Apple Watch app requires watchOS 11 or later. There is no iPad-native version of the iPhone app. The Mac app requires macOS 14 Sonoma or later.

Who it's for

Choose ChromTuner if you use a Mac and want multiple visual tuning displays, historical temperaments, pitch-reference adjustments, and a metronome in one tuner. Its free browser and iPhone editions also make sense for occasional or simpler tuning. Players who tune in loud rehearsal rooms should favor a wired pickup or DI input rather than rely on a room microphone.

Pros and cons

• Pros: Four Mac pitch displays and a broad set of tuning controls support more than basic chromatic tuning.
• Pros: The Mac app accepts Core Audio interfaces and Aggregate Devices, giving musicians a wired input alternative to the built-in microphone.
• Pros: The free iPhone app includes a metronome and string tracking for one instrument, with no ads or account requirement.
• Cons: Room-microphone tuning may be unreliable on noisy stages and during full-band rehearsals.
• Cons: The iPhone app has no iPad-native version, and string tracking for all instruments requires Pro.
• Cons: Mac use requires macOS 14 or later, and the paid license is for one user.

Alternatives

Musical Tuner Apps is a useful next stop for comparing tuner options.

• Centerline is worth considering for its free chromatic tuning across 62–800 Hz, four display views, and guitar modes on Android, iOS, and Mac; its Complete plan is a $$3.99 one-time purchase.
• DaTuner is an Android option with a free tier and a free trial for Premium; Premium removes ads and adds features.
• Fender Tune is a free Android and iOS tuner, with Tune Plus requiring a Fender account.
• gStrings is an ad-supported free option for Android.
• GuitarTuner.io is a free web tuner that also spans Android, iOS, Mac, and Windows; its web tuner is free forever, needs no account, and has no paid upgrade.
• insTuner offers an iOS and Mac alternative with a free tier that includes Instant-Tuning Mode and Tone Generator.
• n-Track Tuner is an Android and iOS alternative with a $$2.99 one-time Pro version.
• Pano Tuner offers Android and iOS versions, with a free ad-supported Android app and a $$3.99 one-time iOS app.

Verdict

ChromTuner is a strong fit for Mac musicians who want several pitch displays, flexible tuning references, and a metronome for a one-time $$6.99 purchase. Its free browser and iPhone options cover lighter needs, but players in noisy spaces should use a wired input, and those needing iPad-native support or intonation monitoring should look elsewhere.