html Piano Interval Trainer · BestPaid

Piano Interval Trainer

静的キーボード図上で任意の2音を選択すると、瞬時に音程名と半音距離を表示する、ステートレスなユーティリティ。

音楽理論ユーティリティ iOS Paid subscription

Available on theApp Store soonRequest TestFlight invite

Screenshots coming soon.

Who it's for

How the subscription works

サブスクリプション付きのフリーミアム

Auto-renews monthly via Apple's standard subscription system.
Cancel anytime in Settings → Apple ID → Subscriptions.
Refunds handled by Apple per their policy at reportaproblem.apple.com.
No third-party tracking or analytics SDKs inside the app.

What we don't collect

Your contact list, photos, location, microphone, or camera.
Any content you enter into the app (notes, logs, data) — it stays on your device unless you explicitly sync.
Identifiers used to track you across other apps.

Full details in our privacy policy.

TestFlight beta

This app is in private beta on TestFlight. To request an invite, email support@bestpaid.app with the subject line TestFlightベータ版：Piano Interval Trainer.

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