# OneLine – Daily Diary — One Line a Day Journal

> One Line a Day Journal (iPhone/iPad app by Kevin Merz.)

- Source: https://appshunter.io/ios/app/oneline-daily-diary/id6760251447 (this page in markdown: same URL + `.md`)
- Developer: [Kevin Merz](https://appshunter.io/developer/1642543757)
- Category: Lifestyle, Health & Fitness
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 3 MB
- Languages: American English, French (France), German (Germany), Italian, Japanese, Korean, Brazilian Portuguese, Russian, Chinese (Simplified, China), European Spanish
- Released: 2026-03-29
- Data updated: 2026-08-24
- User reviews in markdown: https://appshunter.io/ios/app/oneline-daily-diary/id6760251447/reviews.md

## What is OneLine?

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

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Premium | $2.99 | one-time |



## Version history (last 5 releases)

### 1.5 — 2026-08-19

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.

### 1.4 — 2026-08-17

Missed a day? You can now open any past day and write it in. A day you forgot is no longer locked away, and filling the gap puts your streak back together. Free for everyone.

Also in this update:
- Choosing a photo from your library works again
- Add, replace or remove a photo while editing any entry
- Tap a photo to see it full size
- The calendar was hiding the first days of some months
- A day with only a mood now counts everywhere it should
- Tap any day in your activity map to open it
- Faster, clearer feedback when something cannot be saved

### 1.3 — 2026-06-01

Localized screenshots for all supported languages, plus a Restore Purchases button in Settings.

### 1.2 — 2026-05-30

Onboarding card layout fixed for long translations. Mood-only days now count for the reminder skip. Native demo entries in your language. Numerous visual polish across screens.

### 1.1 — 2026-05-20

Now in 8 languages: German, Spanish, French, Italian, Japanese, Korean, Portuguese (Brazil), and Simplified Chinese — full app and App Store listing. New Stats view, plus polish and bug fixes.

## Apps similar to OneLine

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Daily Journal: In One Line](https://appshunter.io/ios/app/daily-journal-in-one-line/id6758918207) | 5.0 (2) | Free | Lifestyle |
| [Pyunto: Private Diary](https://appshunter.io/ios/app/pyunto-private-diary/id6755097890) | — | Free | Lifestyle |
| [Dream Journal - AI Decoder](https://appshunter.io/ios/app/dream-journal-ai-decoder/id6763638918) | — | Free | Lifestyle |
| [One Line Journal App](https://appshunter.io/ios/app/one-line-journal-app/id6759878473) | — | Free | Lifestyle |
| [한줄일기 - 하루 한 줄](https://appshunter.io/ios/app/id6764308678) | 4.5 (2) | Free | Lifestyle |
| [MeteoLife](https://appshunter.io/ios/app/meteolife/id833536091) | 1.0 (1) | Free | Lifestyle |

## More apps by Kevin Merz

- [Swing it! - Rope jumping](https://appshunter.io/ios/app/swing-it-rope-jumping/id1642543665)
- [Rainbow Stacking](https://appshunter.io/ios/app/rainbow-stacking/id1644587632)
- [Lit Jump](https://appshunter.io/ios/app/lit-jump/id1644601561)
- [Hanger.io](https://appshunter.io/ios/app/hangerio/id6444218604)
- [Build This - Block Adventure](https://appshunter.io/ios/app/build-this-block-adventure/id6444769304)
- [Edges - Jumping Stairs](https://appshunter.io/ios/app/edges-jumping-stairs/id6444803938)

All apps by Kevin Merz: https://appshunter.io/developer/1642543757

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*