Guitar String Tension Calc

Calculate the exact tension of guitar strings based on gauge, scale length, and tuning to optimize playability and intonation.

Design iOS Paid subscription

Available on theApp Store soonRequest TestFlight invite

Hard paywall: Premium subscription (weekly, monthly or yearly) or a one-time Lifetime purchase unlocks the full app.

Auto-renews monthly via Apple's standard subscription system.
Cancel anytime in Settings → Apple ID → Subscriptions.
Refunds are handled by the store that took the payment, under its own policy: Apple at reportaproblem.apple.com, Google Play and the Microsoft Store through your account with them.
No third-party tracking or analytics SDKs inside the app.

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.

This app is still in private testing. To be told when it goes on sale, email [email protected] with the subject line Guitar String Tension Calc.