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Not just a calendar. A shield for your time.
Time Defense Calendar is a personal calendar for Android that shows the time remaining until your next event, helping you choose how to spend your time.
Help
Find information about basic operations, FAQs, billing, the trial and AI-readable Markdown documentation.
Support
Find the contact address and information to include when asking for help.
Complete operation guide
A complete, source-grounded operation guide that both people and general-purpose chat assistants can read.
The AI guide is currently provided as a Japanese Markdown file. Save the file, attach it to the AI assistant you normally use, and ask it to explain Time Defense in your language. This is public documentation: the app itself does not include AI features or send your events, Todos or Memos to an AI.