Otoful: Ear Training & Singing

■ Ear training that talks back

Otoful is an ear-training app that gives you instant feedback the moment you sing. Made for casual singers and adult music circles—a cappella, choir, chorus—it helps you build the ear you need to harmonize, a little every day.

This isn't a listen-and-pick quiz. You sing, and you see in real time whether you're on pitch or off—and by how much. So you don't just feel like you understand; you actually train an ear and a voice that can sing in tune.

■ Who it's for
・Singers in a cappella or choir groups who want to harmonize with the people around them
・Anyone unsure about their pitch who wants to stop being "tone deaf"
・People building a foundation for karaoke or vocal lessons
・Anyone who'd rather practice the basics at their own pace, without relying on a more experienced member

■ Six courses
・Pitch 1: listen and match by voice. The core drill—lay your own voice over the guide tone.
・Pitch 2: more advanced ear training. The guide becomes a real human voice, so it feels like singing with someone.
・Cadence 1: hold one voice in a chord. Sing your own part without getting pulled off by the harmony around you.
・Cadence 2: harmonize with real voices. The same drill, with a chord sung by human voices as your guide.
・Rhythm 1: build your sense of rhythm. Tap the beat on screen—no mic and no earphones needed, so you can practice when you can't sing out loud.
・Rhythm 2: keep the beat in a shuffle. The guide's off-beats swing while you keep tapping the same on-beats as Rhythm 1—good practice if swung rhythms make you lose the downbeat.

■ Features
・Real-time pitch detection: instant feedback every time you sing—right or off, and how far.
・Daily lessons: a few minutes each. Short and easy to keep up with.
・Rewards for showing up: track your streak and total practice. We celebrate the habit first, before progress.
・Beginner-friendly tolerance: no harsh scoring out of the gate—land notes that feel good while you sharpen your accuracy over time.
・Practice reminders: a quiet nudge at the time you pick (off by default).
・Share your practice: turn your streak and badges into a card and post it to LINE, X, and more.

■ Designed to keep you going
Judging too strictly breaks beginners. Otoful aims for the sweet spot: satisfying to get right, yet you still feel yourself improving. No demoralizing leaderboards—the only person you're compared to is yesterday's you.

■ Good to know
・The Pitch and Cadence courses use your microphone. Headphones are recommended (they help separate the guide tone from your own voice). The Rhythm courses need neither.
・No account needed. Your practice data stays on your device.
・Free to use, with ads. Every course is free. Missing the pass mark on a lesson you have not cleared yet costs a heart (hearts refill over time), and with no hearts left you cannot start a new lesson. An optional monthly plan gives unlimited hearts and removes the ads.
・The monthly plan is ¥500 per month in Japan (local prices vary) and renews automatically. Cancel anytime in your App Store subscription settings.

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://ishinomaru.com/otoful/privacy-policy

All you need is your voice—no instrument required—to start building your musical foundation today. Aim for the day you can harmonize a song on your own.