Get the official APK
Download SlowInk only from the official SlowInk website download page or the store listing you trust. Avoid random APK mirror sites.
Fix unknown source / blocked install
When Android blocks the install, open Settings → Apps → Special access (or Install unknown apps), allow your browser or file manager once, then install the APK.
After installation
Open SlowInk, grant only the permissions you need, create your account, and explore pen pals, stamps, and time capsules.
Stay safe
Turn off unknown-source permission after install if you prefer. Keep auto-update habits for official releases when available.
FAQ
Why does Android block SlowInk APK?
Android blocks installs from unknown sources by default. Allow your installer app temporarily, then install the official APK.
Is the SlowInk APK free?
Core letter writing and pen pal features are designed to help you start without friction. Optional features may appear in-app.