Harmonize

🎵 Hear a chord, then build it yourself. No multiple choice: slide your finger until your note locks in with the others.

18 ear training games for intervals, chords, relative pitch, play by ear, sight reading and rhythm. Free to start, no account needed.

Warm up your ears before singing, band, orchestra, choir, guitar or piano practice.

Slide to harmonize against a reference tone, play a melody back on a keyboard, tap a rhythm. Producing the interval yourself is what makes it stay. Train with the cute mascots Ebifurya and Kakifurya.

▼ 18 games

• Double Stop — harmonize two notes: unison, octave, perfect 5th/4th, major/minor 3rds and 6ths (8 categories)

• Chords — real 3–4 voice chords, unlocked as you collect stars

• Moon — the reference tone fades away; harmonize from memory alone

• Drone — a bagpipe drone holds the tonic; tune shifts and phrases over it until the beating disappears

• Low Register — bass instruments, where intervals are hardest to hear

• Trill — train the speed and evenness of your trill

• Play by Ear — listen to a melody and play it back on the keyboard (9 categories, 129 levels)

• Sight Reading — read notes on the staff and play them on the keyboard (9 categories, 180 levels, 1,020 exercises)

• Bass Clef — a stage devoted to the bass clef, for bass and left-hand piano parts

• Harmonics — one string vibrating twice or three times as fast: what note does it become?

• Rhythm — tap the offbeats with the metronome: 6 meters from march to sixteenths × 8 sound packs

• Polyrhythm — two hands, two pulses at once

• Mimic Taiko — call and response: hear a rhythm, drum it back

• Memory — a takoyaki memory game where the pairs match by pitch

• Scales — major, minor and the church modes

• Arpeggios — chord arpeggios in just intonation

• Goldfish Scoop — tell the goldfish apart by their tone

• Silent — no sound at all: count the seconds with your internal clock

▼ Tools and extras

• Weekly Challenge — 5 questions, one shot each, with an online leaderboard

• Metronome and Tuner built in

• Tutorial for complete beginners

▼ Built for real practice

• 19 instrument tones — 14 for the main games (piano, organ, violin, trumpet, shakuhachi, flute, bagpipe…) plus 5 bass tones for Low Register

• Adjustable A reference (440–446 Hz)

• Note names in English, German, Japanese or Italian

• Per-voice volume and vibrato

• Rhythm timing calibration — accurate judgement even with Bluetooth earphones

• Cent-level feedback: see exactly how far off you were

▼ 10 languages

English, 日本語, Français, Deutsch, Español, Italiano, Polski, Português (Brasil), 简体中文, 한국어 — switch anytime in Settings.

Free to play, with an optional one-time purchase to remove ads or unlock PRO games. No subscription.

For choirs, wind ensembles, orchestras, bands, singer-songwriters, and anyone learning an instrument — train your ear a few minutes a day.