Last updated 07-30-2026
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AI Diary
AI Diary is a writing assistant built around chat-style journaling. You type or speak about your day, and the app replies with follow-up questions, summaries, poems, and mood notes drawn from your entries. The homepage reports 11,120+ active writers and 50,000+ diary entries on the platform.
Most journaling apps stop at blank pages. AI Diary turns each entry into a two-way conversation, then layers mood graphs, writing scores for readability and grammar, and voice responses on top. The free tier caps you at 5 messages per day with same-day context only, which is a tighter limit than general chat tools but keeps the focus on daily reflection.
People who want a private diary with prompts rather than a blank document use AI Diary for stress relief, goal tracking, and end-of-day debriefs. Login is email magic link, Google, or Twitter, and the privacy policy states entries are encrypted and not used for analytics after sign-in.
Free plan allows 5 messages per day with same-day conversation context only
Mood analysis graphs track emotional patterns across diary entries
Writing analysis scores readability, vocabulary, grammar, and structure
Voice mode lets you narrate entries and hear spoken AI replies
AI actions generate daily summaries and poems from your entries
Smart search finds past entries with AI-assisted relevance ranking
Chat-style prompts reduce blank-page friction compared with traditional diaries
Mood graphs and writing scores turn entries into trackable wellness data
Voice input and spoken replies add a hands-free journaling option
Free tier requires no credit card to start writing
Privacy policy commits to no post-login analytics collection
Free plan caps messages at 5 per day and hides past entries
Exact subscription pricing is not published on the marketing site
Entry text is processed through OpenAI's API, which retains inputs for 30 days
Account creation is required; there is no anonymous guest mode
Is AI Diary free to use?
AI Diary includes a free tier with 5 messages per day, same-day context, and basic chat journaling. Mood graphs, summaries, poems, writing analysis, and search require a paid monthly or annual subscription listed inside the app.
What can AI Diary do on the free plan?
On the free plan, AI Diary limits you to 5 messages daily, remembers only the current day's chat, blocks reading previous days, and disables mood analysis, poem and summary generators, writing-style analysis, and search across past entries.
How does AI Diary handle privacy?
AI Diary encrypts diary entries in transit and at rest, stores personal info separately from entries, and states it collects no post-login analytics. Entry text is sent to OpenAI's API for responses, and OpenAI retains inputs for 30 days for abuse checks only.
What AI model powers AI Diary?
AI Diary uses OpenAI's GPT model to generate conversational replies, summaries, poems, and writing analysis. The site notes that paid subscribers get access to a smarter GPT-4 tier for responses.
How do I sign up for AI Diary?
Create an account on aidiary.io with your name and email to receive a magic login link. You can also sign in with Google or Twitter without setting a password.
Does AI Diary support voice journaling?
Yes. AI Diary lets you narrate diary entries and receive voice responses from the AI, which the site positions as a more personal alternative to typing alone.