Hi Product Hunt! 👋 I'm a solo indie developer from Japan. 🇯🇵 I’ve always been fascinated by the pure, acoustically perfect resonance of Just Intonation. However, I was frustrated that I couldn't find a good iOS piano app that allows musicians to easily switch between Equal Temperament and Just Intonation to actually hear and compare the difference. So, I spent the last few months building Harmodus Piano. 🎹 Key features: ✨ 1-Tap Tuning Switch: Instantly jump between tunings mid-performance. 🥁 Hardcore Metronome: Designed for pros. It fully supports odd time signatures, complex polyrhythms, and even features a per-beat volume mixer so you can fine-tune the accents perfectly. 🎹 MIDI Support: Connect your external MIDI keyboard. 🎸 Smart Chord Display: Real-time chord names on a clean UI, great for practicing and ear training. Whether you're a music theory nerd, a microtonal enthusiast, or just curious about how "true harmony" sounds, I'd love for you to try it out! I'll be hanging out in the comments all day. Let me know what you think or if you have any questions! 🙏

Harmodus Piano - Pure Tuning

Just Intonation piano & pro polyrhythm metronome

Just Intonation piano & pro polyrhythm metronome