01
On by default
Write locally
Entries remain available on your Android device even without a network connection or account.
Offline-first Android journal
An offline-first Android diary with optional sync and AI reflection.
Write and read on your device without the internet. Sign in when you want cross-device sync, and allow diary access only when you choose to use Gemini-powered reports and chat.
★★★★★
Google Play·
Android 10+·
Free to install
Saved offline
AI access off
Android 10+
Available on Google Play
No account
Local writing needs no sign-in
Pause anytime
Pause sync with Offline mode
Only after permission
AI reads entries only after permission
Privacy
Clear controls for local writing, sync, and AI access.
Local use does not require an account. Signing in enables cross-device data sync, Offline mode pauses that sync, and AI features ask for diary access separately.
02
Optional
Control synchronization
Signed-in users can sync diary data across devices. Disable Data sync or use Offline mode to pause synchronization.
03
Separate permission
AI supports reflection
AI reports and diary chat read your entries only after you grant access. Reports require at least seven entries.
A quieter way to keep the day
Made for the moments you want to keep.
Context-rich memories
Record your day with photos, places, moods, and notes that make memories easier to revisit.
Fast daily capture
Open, write, attach, and move on. The interface stays simple enough for everyday use.
Permission-based AI reflection
After you allow diary access, Gemini-powered reports and chat can help you notice patterns and reflect on what you wrote.
Screenshots
See the app before you install it.
The interface keeps writing, photos, mood, and AI review close together without adding clutter.
Write and find entries
Capture the day while it is fresh.
Add rich context
Browse memories by day and context.
Track mood and patterns
Notice how your days change over time.Reflect with AI
Turn entries into useful summaries.Questions
What to know before you start writing.
Questions? Email onediary@soosu.studio for support.
What is ONEDiary?
ONEDiary is an Android journal app by Soosu Studio, Inc. It combines offline writing, photos, places, moods, tags, calendar and search tools, optional cross-device sync, and AI-powered reports and diary chat.
Does ONEDiary work offline?
Yes. Writing and reading work on your Android device without an internet connection. Data sync, share links, and AI features require an internet connection.
Do I need an account?
No account is required for local diary writing. Google sign-in is required when you want to synchronize diary data across signed-in devices.
What does Offline mode do?
Offline mode keeps new changes on your device and pauses Firestore synchronization. Pending changes can synchronize after you leave Offline mode while Data sync is enabled.
How does AI help with journaling?
ONEDiary uses Gemini-powered AI reports and diary chat to identify patterns and support reflection. AI reads diary content only after you allow data access, and a report requires at least seven diary entries.
Is ONEDiary free?
ONEDiary is free to download from Google Play and contains ads and in-app purchases. Premium options remove ads and unlock additional features.
When does ONEDiary sync my entries?
When you are signed in and Data sync is enabled, ONEDiary automatically synchronizes diary data across your signed-in devices. You can disable Data sync or use Offline mode when you do not want changes sent to synchronization storage.
Which devices does ONEDiary support?
ONEDiary is available for phones and tablets running Android 10 or later. An iPhone or iPad version is not currently listed.
Product facts were reviewed on August 18, 2026 using the Google Play listing and ONEDiary Privacy Policy.
Start your diary on Android.
Download ONEDiary for offline writing, rich daily context, optional sync, and AI reflection when you choose it.