ToneCraft

The pendulum snaps back at the edge like a real metronome. Change sound and view with rotary switches—octagonal and hexagonal in lacquer-black on the Japanese theme.

Tone Craft is your all-in-one music practice studio for instrumentalists. Tuner, metronome, harmony (just vs equal temperament beat comparison), attack analysis (waveform and spectrum), recording with waveform playback. Five apps you used to juggle, now consolidated into one.

v4.1 is a large update shaped by lessons from a trumpet teacher's studio and the developer's own practice.

【Daily practice in one app】

• Tuner: high-precision pitch detection with low latency
• Metronome: irregular and compound meters, subdivisions
• Harmony: switch between just and equal temperament to hear the beating
• Attack Analysis: capture waveform and spectrum at the moment of onset
• Recording: waveform preview and seekable playback

【Pro-grade features, daily-touch UI】

The tuner uses the YIN algorithm for high-precision pitch detection. AVAudioSinkNode delivers 20ms low latency. Voice or instrument, it tracks instantly. Reference A4 frequency (440 Hz / 442 Hz etc.) is adjustable. Black keys can be shown as Bb / Eb / Ab — intuitive for Bb instruments like trumpet and clarinet.

The metronome supports irregular meters (5/4, 7/8, 9/8 etc.), compound meters, subdivisions (8th, 16th, 32nd notes), and triplets. New in v4.1: 2-beat triplet, a rare rhythm that divides 2 beats into 3. Custom-built because most metronomes don't implement it. Ideal for tonguing etudes and 3-over-2 polyrhythm practice, with a guide-beats on/off toggle.

Choose from 3 metronome sounds (Wood / Electronic / Claves) to cut through ensembles and classrooms.

A built-in metronome in the Tuner tab makes long-tone practice a single-screen affair.

The harmony tab lets you switch between just intonation and equal temperament to hear the beating difference. A unique training tool absent from most tuner apps.

The attack tab visualizes the waveform and spectrum of each onset, making your articulation and tonguing visible.

【8 themes to choose from】

Free (2):

• Paper: a warm default theme
• Dark: black background for long sessions

Pro (6):

• Steampunk: brass and vacuum tubes on wood grain
• Cat Paws: playful cat paw prints
• Dog Paws: clawed paws with a dog chasing the tuner needle
• Botanic: clovers and acorns in a deep forest
• Wood: wood grain and machined brass push buttons, vintage audio gear feel
• Wafu (Japanese): iridescent cherry blossoms on lacquer-black, with mother-of-pearl hexagon buttons

Each theme has dedicated play-button and beat-marker designs (brass push / vacuum tube / mother-of-pearl hex / clover, etc.). Some themes feature highlight reflections that move smoothly with device tilt.

【Tone Craft Pro】

A one-time 300 yen purchase unlocks all six Pro themes permanently. Future Pro themes are included at no extra charge.

【For existing users】

Your custom rhythms and settings carry over. The Classic mode keeps the original interface intact. Switch anytime from Settings.

【Privacy】

All processing stays on your device. Recordings and tuning history never leave your phone.

【For】

Wind ensemble students, music college students, vocalists, brass and string players — anyone touching an instrument every day.