Quick answer
New logic puzzles every day. No ads, no subscription, works offline.
Daybook is a daily logic-puzzle app for people who like to think.
Every day brings a fresh set of classic logic puzzles: Sudoku, region and placement puzzles, number, sign and symbol grids, pipe networks, flood-fills, one-line paths, code-breaking and chess mate-in-N puzzles. Each comes in three difficulties, Standard, Hard and Expert, and each is built so that it has exactly one answer you can reach by reasoning. Nothing needs guessing.
NO ADS. NO SUBSCRIPTION. NO ACCOUNT. There are no adverts, no paywall, no sign-in and no in-app purchases. The app does not even ask for network access, so it works on a plane, on a train and in a tunnel.
THE WHOLE ARCHIVE, FROM DAY ONE Puzzles are made on your device from the date, so every past day is already there. Missed a week? Play it. Want something different? Switch to Random boards at any difficulty.
LEARN AS YOU GO Stuck? Ask for a hint and Daybook explains the next step in plain language, pointing at the cells it is talking about, rather than just filling one in. Every puzzle has a short walkthrough for first-timers, and "How to play" is always one tap away.
KEEP YOUR STREAK Track your daily streak, your times and your statistics, all stored privately on your phone.
PRIVATE BY DESIGN Daybook collects nothing. No analytics, no trackers, no third-party SDKs. Your progress never leaves your device.
Hand-built puzzle generators, proven boards and a calm, uncluttered design. Come back tomorrow for the next one.
Screenshots
How to install
- Download the APK from the button at the top of this page.
- Allow “Install unknown apps” for your browser or file manager only, not for every app.
- Open the downloaded file and confirm the installation.
- If installation fails with “App not installed,” remove an earlier build of the same app first. A signature conflict is the usual cause.
Data safety
- Every file is checked against its published SHA-256 before it is listed.
- Files are scanned for malware on every update.
- The permissions each app requests are listed on its own page.
- Read the full safety policy for how we test, flag, and delist files.
Frequently asked questions
What is Daybook: Daily Logic Puzzles?
New logic puzzles every day. No ads, no subscription, works offline.
Who develops Daybook: Daily Logic Puzzles?
Daybook: Daily Logic Puzzles is developed by Joseph Howe.
Which Android version does Daybook: Daily Logic Puzzles require?
Daybook: Daily Logic Puzzles requires Android API 26 or later.
What is the current version of Daybook: Daily Logic Puzzles?
The synchronized F-Droid version is 0.1.131.
Which license does Daybook: Daily Logic Puzzles use?
The signed F-Droid metadata lists AGPL-3.0-or-later.
Where is the source code for Daybook: Daily Logic Puzzles?
https://github.com/joebywan/daybook
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