Harmonize

🎵 Ear training that sticks — 14 games for intervals, chords, rhythm and playing melodies by ear. Free to start, no account needed.

Most ear trainers ask you to pick the answer from a list. Harmonize asks you to *make* the sound: 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.

▼ 14 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

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

• Trill — train the speed and evenness of your trill

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

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

• Polyrhythm — two hands, two pulses at once

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

• Takoyaki — a memory game where the pairs match by pitch

• Scales — major, minor and the church modes

• Arpeggio — 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

• 17 instrument tones — 13 for the main games (piano, organ, violin, trumpet, shakuhachi, flute…) plus 4 bass instruments 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

▼ 8 languages

English, 日本語, Français, Deutsch, Español, Italiano, 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.