01
What it is
Angle Lock is an iPhone app by Rivership, an indie studio in Tokyo. It is for keeping short notes and a few files, such as Wi-Fi passwords, door codes or booking numbers, out of a plain notes app.
On a folding phone running iOS 27.1, the opening angle is read from the hinge. You choose 2 or 3 angles and how close you need to be (±6°, ±10° or ±15°). Nothing on screen reveals the angles; the gauge shows only where the phone is now. On a phone without a hinge, an on-screen dial covers the same 0 to 180° range.
02
Questions this app answers
- How do I lock notes with something other than a passcode? Angle Lock asks for a sequence of opening angles first, then always requires Face ID, Touch ID or your passcode.
- Is there a note vault for folding phones? Yes. It reads the hinge angle on a folding phone running iOS 27.1.
- What if my phone has no hinge? An on-screen dial replaces the hinge and works the same way.
- Does it lock automatically? Closing the phone locks it immediately, leaving the app locks it, and the content is hidden in the app switcher.
- Does it sync or go online? No. There is no iCloud sync, no account, no analytics and no internet connection.
03
Features
- Angle sequence: 2 or 3 angles, tolerance ±6°, ±10° or ±15°.
- Second factor: Face ID, Touch ID or passcode is always required.
- Text notes and files: files added from the Files app can be previewed in the vault.
- Instant lock: closing the phone or leaving the app locks it; the app switcher hides the content.
- Dial mode: an on-screen dial for phones without a hinge, or by choice.
04
What it does not do
- The angle key is a quick first step and does not replace the device lock.
- There is no way to recover the key. If you forget it, erase the vault and set a new one.
- It does not sync, back up to iCloud or connect to the internet.
05
Price
Angle Lock is a one-time purchase with no subscription and no in-app purchases. The price is shown on the App Store.
06
Privacy and data
Notes and files stay in this app on this phone, written with the system's file protection so they are unreadable while the phone is locked. There is no iCloud sync, no account, no analytics, and the app never connects to the internet.
07
FAQ
What is Angle Lock?
A note and file vault that you open by folding the phone through a sequence of angles and then confirming with Face ID, Touch ID or a passcode.
Can I recover the key if I forget it?
No. Erase the vault and set a new one.
Is it safe to rely only on the angles?
No. The angle key is only a first step; a second check is always required.
Does Angle Lock work offline?
Yes. The app never connects to the internet.
How much does Angle Lock cost?
Angle Lock is a one-time purchase with no subscription and no in-app purchases. The price is shown on the App Store.
Does Angle Lock send my data anywhere?
Notes and files stay in this app on this phone, written with the system's file protection so they are unreadable while the phone is locked. There is no iCloud sync, no account, no analytics, and the app never connects to the internet.
Which languages and devices are supported?
English and Japanese. iPhone with iOS 27.1 or later; folding phones read the hinge angle, other phones use the on-screen dial.
iPhone · iOS 27.1+ · Version 1.0