Chromtuner
A chromatic tuner for macOS. ±1¢ accuracy
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ChromTuner for macOS & iPhone - Precision tuning for musicians — now on Mac & iPhone

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Native macOS chromatic tuner. ±0.14¢ YIN accuracy, 8 historical temperaments, LED + strobe display modes, instrument presets for guitar, bass, violin, ukulele and more. Runs offline. One-time purchase, lifetime updates.

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Hey Product Hunt 👋 ChromTuner is a precision chromatic tuner built for musicians who care about the details — and today it takes two big steps: 🍎 Now on the Mac App Store. Chromatic Tuner for macOS is officially available on the App Store — same one-time $6.99, same features as the direct download. Install and update through Apple, or grab it straight from chromtuner.com. Your call. 📱 New: ChromTuner for iPhone (free). The same YIN pitch engine — accurate to a fraction of a cent — now in your pocket. Free means free: chromatic mode, Standard E & Drop D, the LED meter and analog needle, and a haptic tap the moment your string locks in. A one-time $6.99 Pro unlock (no subscription) adds all 15 instrument presets, Peterson-style strobe + waveform displays, 8 historical temperaments, A4 calibration, capo, transpose, and full personalization. What makes it different: 🎯 ±1¢ real-world accuracy (±0.14¢ on pure tones) via the YIN algorithm 🎛️ Four display modes — LED bar, analog needle, Peterson-style strobe, sine wave 🎸 15 instrument presets: guitar, bass, violin, viola, cello, double bass, ukulele, mandolin, banjo 🎼 8 historical temperaments with movable tonic 🔒 100% offline — audio is processed on-device and never leaves it. No tracking, no account. 💸 One-time purchase. No subscription, ever. At your desk it lives in your Mac menu bar; on the go it's a tap away on iPhone — same obsessive precision either way. I'd love your feedback and questions 🙏

The historical temperaments are a really thoughtful touch, especially for period instrument players. Opens near instantly and the preset for bowed strings works exactly as you'd hope.

Been using Chromtuner for a few weeks now and it’s impressively fast. One thing I’d love to see is the ability to save custom presets for alternate tunings like open G or drop D, so I don’t have to manually adjust each time I switch guitars. That would make it perfect for quick sessions.