Overlay widget
A floating, draggable widget on top of any app. Mark an episode or chapter without leaving what you are watching or reading.
OTAKU'S LIBRARY
ALL IN ONECompanion app
Track anything,without switching apps.
A floating overlay widget that marks episodes, chapters and volumes from whatever you are watching or reading — then syncs instantly with your Otaku Library account.
Free
forever
Android
+ desktop
Real-time
sync
Companion widget · live demo
Frieren · EP 7 — tap + to mark
7
Episode
Works over any app — no switching needed
Why Companion?
Everything you need to track your anime and manga journey, minus the tab-switching.
Real-time sync
Progress syncs instantly with your Otaku Library account. Pick up on desktop exactly where you left off on your phone.
Quick actions
Search the library, review tracking history and browse trending series from the widget — no app switching required.
Up and running in minutes
Three steps. No complicated setup.
- STEP 1
Install the app
Grab the build for your device below. On Android, allow “install unknown apps” once when prompted.
- STEP 2
Sign in
Log in with your Otaku Library account so progress syncs across phone and desktop.
- STEP 3
Track from anywhere
Grant overlay permission, open anything you are watching or reading, and tap the widget to mark progress.
Download
Pick your platform. The recommended build is highlighted — everything else tucks away neatly.
Install guide
Platform-specific steps — no guesswork.
Android
- 1Download the ARM64 APK above (fits almost every modern phone).
- 2Open the file — allow “Install unknown apps” for your browser if asked.
- 3Tap Install, then open Companion and grant overlay permission.
- 4Sign in with your Otaku Library account. Done.
Windows
- 1Download the Windows build from the Windows tab.
- 2Run the installer, or unzip the portable build anywhere.
- 3Launch Companion and sign in with your library account.
- 4Pin it to Start if you want quick access while watching.
Linux
- 1Download the Linux build from the Linux tab.
- 2For AppImage: run chmod +x *.AppImage, then launch it.
- 3For archives: extract, run the binary inside.
- 4Sign in — progress syncs with the same account.
Questions, answered
Safety, sideloading, permissions and updates.
Is the Companion app safe to install?
Yes — builds are published on the official GitHub releases page with SHA-256 checksums shown here. Only install files linked from this page. On Android you will see an “unknown app” prompt because the APK is sideloaded rather than from the Play Store; that is expected.
Why does Android ask me to allow “unknown apps”?
Android blocks installs from outside the Play Store by default. When you open the APK, allow it once for your browser (Chrome, Firefox, etc.), then proceed. You can revoke the permission afterwards.
Which APK should I download?
ARM64 fits virtually every phone from 2015 onward — it is the highlighted recommended build. Use ARM 32 only for very old devices, x86_64 for emulators/Chromebooks, and Universal if you want one file that runs anywhere (it is larger).
Do I need an Otaku Library account?
Yes. The widget syncs progress to your library account, which is what makes phone ↔ desktop handoff work. Sign-in happens inside the Companion app after install.
What permissions does the overlay need?
“Display over other apps” so the floating widget can sit on top of video readers and players. No accessibility-service access, no contacts or SMS — just overlay plus internet for syncing.
Is there an iOS version?
Not yet — iOS does not allow system-wide overlay widgets the way Android does. iPhone and iPad users can still use the main otakuslibrary.com site, which works fully in mobile Safari.
How do updates work?
Check this page or the GitHub releases for new versions. Install the new APK over the old one — your login and settings carry over. Windows/Linux builds update the same way: download and replace.