Effective 9 September 2026 · LangSongs LLC
These terms are an agreement between you and LangSongs LLC, a Florida limited liability company ("we", "us"), covering the Patina app for iPhone. By installing or using Patina, you agree to them. If you do not agree, do not use the app.
We grant you a personal, non-exclusive, non-transferable licence to use Patina on Apple devices you own or control, as permitted by the App Store Terms of Service. You may not copy, sell, rent, sublicense, reverse-engineer or attempt to extract the source code of the app, except where that restriction is prohibited by law.
The tuner and metronome are free. Full Trainer is a one-time in-app purchase — not a subscription. There is nothing recurring to cancel, and no countdown or trial that expires into a charge.
The purchase is made through Apple. Apple takes the payment, sets the price shown in your storefront, and holds the record of the transaction. Once purchased, the entitlement is tied to your Apple Account: use Restore Purchases on the paywall or in Settings to bring it back after reinstalling or on another device signed in to the same account. Full Trainer is enabled for Family Sharing, so your family group can use it under Apple's rules for that feature.
Refunds are handled by Apple, not by us. We cannot issue, approve or deny a refund for an App Store purchase. Request one at reportaproblem.apple.com. If something is broken, email us anyway — we would rather fix it.
Patina estimates pitch, timing and chords from the sound your phone's microphone picks up. It can be wrong. Room noise, a poorly intonated instrument, an uncalibrated latency measurement, a quiet or distorted signal, or an unusual tuning can all produce a score that does not match what you played. Nothing in the app is a measurement instrument or a judgement of your playing.
The app is provided "as is" and "as available", without warranties of any kind, express or implied, including any implied warranties of merchantability, fitness for a particular purpose, accuracy, or non-infringement. We do not warrant that the app will be uninterrupted, error-free, or compatible with any particular device or instrument.
Use Patina lawfully. Do not attempt to circumvent the purchase or entitlement checks, interfere with or overload any service the app talks to, use the app to infringe anyone's rights, or redistribute the app or its content. Do not use automated means to access the app in ways it was not designed for.
Your practice data lives on your phone. You are responsible for backing it up — the app can export your data as a file. Deleting the app deletes its data. What the app sends, and what it never sends, is described in the Privacy Policy, which is part of these terms.
Patina, its name, its icon, its design, its exercises, its code and everything else in it belong to LangSongs LLC and are protected by copyright and other laws. These terms grant you a licence to use the app, not any ownership in it. Your own practice data is yours.
Patina is currently distributed as a beta through Apple TestFlight. Beta builds may be incomplete, may contain defects, may lose data, and may stop working when a build expires. Everything in these terms applies to them, and the "no warranty" section applies with particular force.
You can end this agreement at any time by deleting the app. We may suspend or end your licence if you materially breach these terms. We may also stop distributing or supporting Patina, or discontinue a feature, at any time. Sections that by their nature should survive — intellectual property, no warranty, limitation of liability, and governing law — survive termination.
To the fullest extent permitted by law, LangSongs LLC will not be liable for any indirect, incidental, special, consequential or punitive damages, or for lost data, lost profits, or lost practice time, arising out of or relating to your use of Patina. Our total liability to you for any claim relating to the app is limited to the amount you actually paid for it — which, if you have not bought Full Trainer, is zero.
Some jurisdictions do not allow some of these exclusions, so parts of this section may not apply to you.
Apple is not a party to these terms and has no obligation to provide support for Patina. Apple is a third-party beneficiary of these terms and may enforce them against you.
We may update these terms. The effective date at the top tells you when they last changed. Continuing to use the app after a change means you accept the updated terms.
These terms are governed by the laws of the State of Florida, United States, without regard to its conflict-of-laws rules. Any dispute will be brought in the state or federal courts located in Palm Beach County, Florida, and you and we consent to that jurisdiction.
LangSongs LLC, 437 N Country Club Dr, Atlantis, FL 33462, USA — hello@gripto.computer.