OneLine – Daily Diary
Kevin Merz Lifestyle iPhoneiPadiPod touch
OneLine – Daily Diary is a free Lifestyle app for iPhone and iPad by Kevin Merz. Rated 5.0/5 from 1 ratings. Requires iOS 17.0. Updated August 19, 2026.
- Rating
- 5.0
- 1 ratings
- Price
- Free
- on the App Store
- Size
- 3 MB
- Age 4+
- Updated
- Aug 19
- 2026 · v1.5
Screenshots
About OneLine – Daily Diary
One line. Every day. Your story. OneLine is the beautifully simple journal that helps you capture each day in a single sentence. No pressure, no long-form writing, just one meaningful line that captures your moment. DAILY JOURNALING, SIMPLIFIED - Write one line per day (up to 280 characters) - Track your mood with five expressive moods - Attach photos to preserve visual memories - Daily writing prompts to spark inspiration MISSED A DAY? WRITE IT ANYWAY - Open any past day and fill it in later - A day you forgot is never locked away - Filling a gap puts your streak back together - Free, because writing in your own diary should be TRACK YOUR JOURNEY - Build writing streaks and stay consistent - See at a glance which days you journaled - Tap any day to open it right from your stats - See mood trends and patterns over time - On This Day: rediscover entries from past years YEAR IN REVIEW - Beautiful, interactive annual summary - Mood charts, writing activity graphs, and more - Tap any chart for detailed insights - Share your Year in Review as an image YOUR DATA, YOUR PRIVACY - Entries stay on your device and sync privately - Export your journal anytime as PDF or text - No ads, no tracking, no data collection - Lock your journal with biometric authentication (Premium) PREMIUM (One-time purchase, yours forever) - Photo memories on every entry - Biometric app lock - Streak shield: covers one forgotten day a month - Support independent development Everything else stays free: unlimited entries, filling in days you missed, search, export, activity map, Year in Review, On This Day, mood tracking, stats and cloud sync. Start your one-line-a-day habit today. It takes 30 seconds, but the memories last forever. --- Privacy Policy & Terms of Use: https://merzkevin.de/privacy-OneLine.html
What’s new
Version 1.5 · Updated August 19, 2026
A fix for VoiceOver in the activity map: each day now opens the day it announces. It used to name one date and open the one a week later. If you missed version 1.4, that is the one to look for: you can open any past day and write it in, choosing a photo from your library works again, and a calendar bug that hid the first days of some months is fixed.
App privacy
The developer, Kevin Merz, reported these privacy practices to Apple.
Data Not Collected
The developer does not collect any data from this app.
Alternatives to OneLine – Daily Diary
Looking for apps like OneLine – Daily Diary? Here are 6 similar apps on the App Store.
-
Micro Journal: One Line a Day
-
OneLine — Daily Journal
-
Three Lines: Daily Journal
-
One Line a Day Diary
-
シンプル3行日記
-
Lynes: One Line a Day Journal
| App | Rating | Price | Last updated | Compare |
|---|---|---|---|---|
| OneLine – Daily Diary | 5.0 / 5 (1 rating) | Free | August 19, 2026 | |
| Micro Journal: One Line a Day | – | Free | Aug 4, 2026 | Compare |
| OneLine — Daily Journal | – | Free | Aug 19, 2026 | Compare |
| Three Lines: Daily Journal | – | Free | Oct 9, 2026 | Compare |
| One Line a Day Diary | – | Free | Jul 23, 2026 | Compare |
| シンプル3行日記 | – | Free | Jul 24, 2026 | Compare |
| Lynes: One Line a Day Journal | – | Free | Jul 10, 2026 | Compare |