A private diary app.
Turn on the rain, talk to the AI for a bit, and the day's entry appears.
Unlimited entries
Write as much, as often as you like. Free users have no entry limit.
Every device
Open a browser and write. Phone, tablet, laptop all work. iOS native app coming soon.
Saves as you type
Every keystroke is saved. Close the tab or lose connection — nothing is lost.
Rain sound + rain curtain
The rain loops in the background. Four sliders for amount, speed, fog, and refraction tune it the way you want.
AI guidance
When you don't know what to write, the AI asks a few follow-ups that keep up with your train of thought. After the conversation, the day's entry appears on its own.
And more
Anonymous by default, not used for model training, one-click export, poster generation, 8 languages.
Built for these moments.
Rainku is built for people who want to write today down. A quieter way in, an anonymous private journal, the first time you journal, or a journal that looks the way you want — or just write freely without picking one.
Wherever you write.
Rainku runs smoothly in any browser. Nothing to install on Mac, Windows, or Linux. The same page works on phone and tablet. iOS native app in the works.
Why people choose Rainku.
- They want a writing space with rain as the background, not the noise of notifications and algorithms.
- They want to say it out loud, but not to a person. Rainku turns the conversation into an entry.
- They want a record nobody else sees and nothing else trains on.
How to start.
Journaling is one of the few things time keeps proving useful. Every time you write, a past day is seen again.
- 1Open it
Go to Rainku.com. The rain starts. No sign-up.
- 2Say a few things
Type into the chat box, or tap the mic. The AI asks a few follow-ups that keep up with your train of thought.
- 3Look back / share
Next time you come back, flip the calendar to a past day. If you want to share it, generate a poster.
Choose your plan.
Rainku is free by default. Pro unlocks more credits, longer context, and the higher-tier model.
Free
Start writing — no credit card needed.
- Unlimited entries
- Rain sound + rain curtain
- AI conversation (daily credits included)
- Poster export
- Cross-device sync (after sign-in)
Pro Monthly
- Everything in Free
- 3,000 credits per month
- Pro model unlocked (longer context)
- Voice-guided conversations
- Priority support
Pro Annual
About 17% off monthly
- Everything in Pro Monthly
- 36,000 credits per year