SideApp
MemoLock
Private diary with lock
v2.6.0 · AndroidGet
SideApp: Android apps and games by an independent developer
On Google PlayMemoLock
A private diary that locks, and can't go online.
A page a day in a diary encrypted on your phone, with a question of the day, a calendar of your moods and what you wrote a year ago. Your notes, photos and voice notes sit next to it, behind your code or your fingerprint.
Version 2.6.0 · Updated 6 November 2026 · No Internet permission
Apps
Everyday tools without an account or the Internet permission.
Surprise!
Gift and date ideas, early enough
Closed testJoin the test
Games
Made differently from the apps: each game has its own privacy policy, and Superalloy shows optional rewarded ads.
Closed test
Closed test
Guides for a private diary and private notes
From the MemoLock blog, checked against each app's own documentation.
- ComparisonPrivate Diary App for Android: Lock vs Encryption
- Writing30 Journal Prompts for a Private Diary, With a Question a Day
- How-toHow to Lock Notes on Android With a Password (Samsung, Google Keep)
- ComparisonThe Most Private Notes Apps for Android, Compared
- How-toHow to Move Your Notes to a New Android Phone
More on locked and private notes
What you won't find in MemoLock or Staticar
Android lists every permission an app asks for. Theirs don't include Internet access, so the apps themselves send nothing anywhere.
- No: The Internet permissionAndroid won't let them go online.
- No: An accountOpen the app and start.
- No: Ads or in-app purchasesNothing to watch, nothing to buy.
- No: Analytics or trackersI never see your data.
Play them before they're out
Superalloy, Surprise! and Base & Wilds are in closed testing on Google Play. Join the testers group, opt in, and tell me what to fix before everyone gets them.
One developer, who reads every message
SideApp is one person: I build these apps and games, and I answer the mail myself. Found a bug, or missing a feature? Tell me.