What is micro-journaling?
Instead of a page a day, you write a sentence or two whenever something matters: a feeling, a small win, a worry, a line someone said. Over weeks those lines add up to a surprisingly honest record — and they're easy to keep up.
A private timeline
The DiaryFast feed looks like a social timeline with an audience of one. Post, add a mood emoji, a photo or the weather if you like, and an AI persona can reply underneath like a friend would. No followers, no likes to chase.
When one line becomes more
Any post can grow: open it in the long-form editor, or tap Talk it through to explore it with The Coach or The Mentor.
Ideas for one-line entries
- The best part of today was…
- Right now I feel… because…
- One thing I want to remember…
- What I'm worrying about, in one sentence.
- Tomorrow, I'll be glad I…
Free and Pro
Writing, prompts, mood tracking, photos, weather and your weekly stats are free forever, with 3 AI replies a day. Pro adds unlimited AI, AI reports, encrypted sync and PDF export. Or try everything for a day with the $4.99 pass.
| Feature | Free | Pro |
|---|---|---|
| Journal entries (short posts and long form) | Unlimited, on your device | Unlimited |
| Daily prompts, mood check-ins, mood calendar & year map | ✓ | ✓ |
| Photos, weather and place on entries | ✓ | ✓ |
| Voice to text | 60 seconds per take | Unlimited |
| Voice conversation (replies read aloud, hands-free answers) | ✓ | ✓ |
| AI replies & CBT coaching (Friend, Coach, Mentor, Chronicler) | 3 per day | Unlimited (fair use) |
| Your own OpenAI / Anthropic key (BYOK) | ✓ no daily limit | ✓ |
| Weekly report: mood curve, keywords, streaks | ✓ | ✓ |
| AI weekly & monthly reflection reports | — | ✓ |
| Your month as a PDF book (entries, photos, AI replies) | Preview | ✓ |
| End-to-end encrypted sync between devices | — | ✓ (monthly or yearly) |
| Passphrase lock (AES-GCM) & JSON backup | ✓ | ✓ |
Questions
Is one sentence really useful?
Yes. Short, frequent entries capture feelings while they're fresh, and they make patterns visible in the weekly report.
Can I post from my phone's home screen?
Install DiaryFast (Share → Add to Home Screen on iPhone, Install on Android) and it opens straight to the feed.
DiaryFast is a journaling and self-reflection tool. It is not therapy and doesn't diagnose or treat any condition. If you are in crisis, contact local emergency services or a crisis line (US & Canada: 988).