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A journal that writes back: write today, get a personal letter and emotion analysis tomorrow
Visit Official WebsiteProduct Type
Software
Platform
AppleAndroid
Languages
Turkish / English
Regions
Global
Pricing
Freemium
Price
Free to use; advanced themes, fonts, and deeper weekly reports unlock via subscription, with tiers not publicly disclosed.
Free Trial
✓ Trial Available
Free to download for core features; advanced quotas/characters/scenes unlock via in-app purchases.
Last updated 2026-10-31· Content established
Data may be delayed — always check the official website for the latest info.
Visit Official WebsiteAbout This Tool
Cotidie is a "journal that writes back," developed by Emre Omer Yldz. The core experience: you write today—three words or three pages—and the next morning a letter awaits, written by an AI companion that read what you wrote and remembered how you felt: not advice, not a score, but a letter. Features include guided writing (AI asks probing questions based on your entry to help you think deeper), emotion distribution and a weekly mind report, voice writing (speech-to-text), drawing and photo journals, a Secret Vault (PIN/biometric encryption, never sent to servers), a Time Capsule (a letter to future you, opened only on the set date), and 10+ languages (Turkish, English, German, Japanese, Korean, and more) with PDF/JSON/TXT export. It emphasizes on-device encrypted storage, never sold or used for ads. Launched May 2026 with ratings still accumulating.
Background
Developed by Emre Omer Yldz and launched May 2026, Cotidie is positioned as a "journal that writes back," from a Turkish developer.
Technology
Centers on an AI companion that reads the journal and replies next day, combined with guided probing questions, emotion distribution and weekly reports, voice writing, and drawing/photos; Secret Vault uses PIN/biometric encryption and is never sent to servers. Underlying model not disclosed.
Market
Launched 2026 with very few ratings (~1), still early; the site claims ~1.2M encrypted words and 100+ regular users, unverified independently.
Best For
People wanting a writing habit and to feel "understood"Users who like voice/drawing/photo journalingThose who need emotion tracking and weekly reports
Editorial Note
The "personal letter next day" concept is gentle and distinctive, with solid privacy and multilingual support; downsides are its newness and very few ratings—subjective experience varies.
Strengths
- + AI replies next day—feels understood, not scored
- + Secret Vault on-device encryption, privacy solid
- + Voice/drawing/photo and 10+ languages for varied logging
Drawbacks
- − Launched 2026 with very few ratings
- − Advanced paid tiers not disclosed
- − Reply quality depends on the model; subjective
Value Assessment：Good for those building a writing habit who value emotion tracking and privacy.
External Resources
FAQ
How do I use Cotidie?
Write today's mood (text, voice, drawing, or photo). The AI asks follow-up questions to help you go deeper and sends a personal letter the next morning after reading your words. You can also view emotion distribution and a weekly mind report.
Does it cost money?
Free to write and receive replies; advanced themes, fonts, and deeper weekly reports unlock via subscription, with pricing not publicly disclosed.
What languages are supported?
10+ languages including Turkish, English, German, Japanese, and Korean; data can be exported as PDF/JSON/TXT.
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All information on this site is for reference only. Data may be delayed — always verify on the official website. Listings are in no particular order.