HarpMaster — learn the harmonica with real-time feedback

The harmonica is one of the most welcoming instruments on the planet — small, cheap, portable, and you can make a noise come out of it on day one. It’s also one of the easiest instruments to quit, for a reason most people don’t pin down before they give up: when you blow or draw, you can’t see what you just played.

A guitar string is right there. A piano key has a label. A harmonica gives you a row of identical-looking holes and a sound that may or may not be the note you wanted. Mis-bending a draw note and not noticing for three weeks is a normal beginner experience. Most people give up before they realize the problem isn’t them — it’s missing feedback.

HarpMaster is built around fixing that single problem.

How it works

Open HarpMaster, hold your harmonica up to your phone, and play. The app listens through the microphone, detects the pitch of every note you produce, and shows you on a visual harmonica:

• Which hole you played — colored by the action it took (blow, draw, draw bend, blow bend, overblow, overdraw)
• How in-tune you were — a cents needle that swings as you adjust your embouchure
• Whether the note matches what you intended — when you’re following along with a song, hits are green, misses are red, late or out-of-tune notes get the in-between colors

You learn faster because every breath gets feedback within a few hundred milliseconds. The mystery — was that the right note? — disappears.

What’s in the app

A complete Blues 10-hole harmonica model. Every fingering you’ll ever encounter, including the difficult ones: 1–6 draw bends (with three positions on the 3-hole, the most expressive on a diatonic), 8–10 blow bends, 1–6 overblows, and 8/9/10 overdraws. Pick any of 21 keys (Low C through High G) and the visual map adjusts.

Eleven tunings, plus a custom tuning editor. Standard Richter is the default, but if you play country tuning, Paddy Richter, natural minor, harmonic minor, Wilde tuning, or anything else, it’s already in the picker. If you have your own custom tuning — say, a chord-tuned harp you reed-swapped at home — you can lay it out hole-by-hole and save it as a preset.

A dynamic score with four notation views. Piano roll for visualizing pitch over time. Jianpu (numbered notation) for the way most Chinese musicians read. Standard staff with key signatures and accidentals. A dedicated rhythm-only view for percussion and rhythm-training drills. Switch between them with one tap; the same MIDI plays through all four.

Practice modes. Pick a scale, interval, or arpeggio pattern with adjustable tempo, direction, and rhythm — the app counts you in and grades each note (pitch + timing + hole-hit accuracy). Or jump into a 12-bar blues with three-piece backing (drums + bass + keys) and improvise over real chord changes that match what you’re seeing on the harmonica.

Recording and playback. Capture what you played, see the notes laid out on the dynamic score, and export as MIDI for use elsewhere.

Metronome with downbeat sync. Free-standing or auto-locked to whatever song or pattern you’re practicing.

Built for the long arc

HarpMaster is designed so you can stay in it for years, not weeks: the practice modes have enough depth for intermediate players, the tuning editor is there for people who customize their gear, and the score views let you bring your own MIDI files alongside the built-in demos. The free tier covers everything you need to practice; Premium removes ads and unlocks a few power-user conveniences.

Where it runs

• iOS — App Store
• Android — Google Play (international) or download direct (China)
• Web — open it in any modern browser, no install

The same engine runs everywhere. Microphone permission is required (audio is processed entirely on-device — pitch detection never leaves your phone).

What’s next

This is the first release, but it’s already pretty deep. Coming up: chromatic and tremolo harmonica models, more practice content, a song catalog with backing tracks. We’d love to hear what you’d want most — every feature in HarpMaster started as a real player saying “this should exist.”

If you’ve been meaning to learn the harmonica — or if you’ve been playing for years and want a tool that actually shows you what your breath is doing — we hope HarpMaster earns a spot on your phone. Pick it up, blow into it, and tell us what you find.

— The HarpMaster team