ChordFrog: Hear a chord and name it — free, in your browser and on iOS

Hi Product Hunt 👋 I'm Timo, and I build ChordFrog on my own from Helsinki. This started because I couldn't find the app I wanted. Ear training — hearing a chord and knowing what it is — is the part of music education people skip most, because it's tedious alone and hard to measure. What I tried was either passive multiple-choice that never touched my keyboard, or a sprawling theory suite where ear training was a buried sub-menu. I wanted the narrow thing: a chord recogniser that uses the MIDI keyboard already on my desk, and that still works when I'm nowhere near it. You can try it without installing anything — chordfrog.app/chord-identifier runs in this browser, plays a real piano chord and asks you to name it. If you have a MIDI keyboard connected, it names what you play. That page is the app's argument in about thirty seconds. Two details I care about: • The piano is real. The audio is the Salamander Grand Piano library, a sampled Yamaha C5, not a synth patch. Train your ear on an approximation and it doesn't transfer to a real instrument. • Nothing is gated. No subscription, no accounts, no paywall — every mode and every level is open from first launch. It carries ads (a banner on the menu, one after a finished round) and that is the whole business model. A one-time remove-ads purchase is in review now. If you have a keyboard, Free Pond is the mode to try — play anything and it names the chord live, inversions and slash chords included. If you don't, start with Leap Quiz. I'll be in the comments all day. I'd genuinely like to hear where it falls short, especially from anyone who teaches.