Most harmony tools are too theoretical or too simple. Coffee Piano combines a real piano studio, sampled Piano & Rhodes, MIDI, sustain pedal with a visual harmony engine. Orbit visuals show scales and chords as circular maps. A harmony map reveals voice leading and chord function. Reharmonize in one click per bar or full progression. Guitar diagrams sync to every chord. Works in the browser, no install, bilingual UI.
I built Coffee Piano because there was no tool that let you hear a chord idea, see it as a visual map, and understand the harmonic logic behind it, all in the same place. Most tools are either a sound engine with no theory, or a theory reference with no sound. That disconnect is what Coffee Piano solves. It brings harmony to life visually through orbital scale and chord maps, a real piano and Rhodes engine with MIDI, smart progression generation, reharmonization, and guitar diagrams, all in the browser. Built for musicians who think in harmony, not just in notes. Would love to hear your thoughts.
The visual map is a cool idea, but I'm confused on what it actually represents. Especially the second picture.
@adictum very interesting! Do you have to be a pro musician, or you can figure it out even if you're an amateur?
Pulled up the orbit visual and got why you went circular for scales. Symmetry that's invisible on a keyboard becomes obvious on a circle right? When you reharmonize a bar, does it stay diatonic by default?
Pretty cool i dig it. Your chord variations are using guitar tabs which i found a little weird for a piano app but as a player of both i can see the advantage there. In general its a cool product with some cool things to offer.
Im not an expert at marketing but maybe throwing the price around so much might hurt. The price point i think is fair its just that its mentioned everywhere on the site, but i do get that a lifetime is unheard of these days haha. Again i am no expert at all its just my opinion. As for the app itself the visuals are really great and a beautiful way of seeing all this theory. Good luck!
About Coffee Piano on Product Hunt
“Browser music and piano studio with visual harmony tools”
Coffee Piano launched on Product Hunt on May 29th, 2026 and earned 99 upvotes and 12 comments, placing #13 on the daily leaderboard. Most harmony tools are too theoretical or too simple. Coffee Piano combines a real piano studio, sampled Piano & Rhodes, MIDI, sustain pedal with a visual harmony engine. Orbit visuals show scales and chords as circular maps. A harmony map reveals voice leading and chord function. Reharmonize in one click per bar or full progression. Guitar diagrams sync to every chord. Works in the browser, no install, bilingual UI.
Coffee Piano was featured in Music (53.4k followers), Education (78.7k followers) and SaaS (42.5k followers) on Product Hunt. Together, these topics include over 84.6k products, making this a competitive space to launch in.
Who hunted Coffee Piano?
Coffee Piano was hunted by Jaime. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Jaime