Privacy

Due Date Buddy has two parts, and they handle what you type differently.

The quick calculator

The calculator runs entirely in your browser. Due dates, late-fee schedules, and reminder text are computed on your device in plain JavaScript — nothing you enter in the calculator is sent or stored anywhere, and it keeps working offline. When you close the tab, it’s gone.

The chat assistant

When you send a chat message, your message and the conversation so far are sent to this site’s server (hosted on Cloudflare), which forwards them to Anthropic’s Claude API to generate the reply. The math behind every answer is still computed by this site’s own code — the AI is only used to understand your question and phrase the response.

There are no accounts and no database: we don’t store your conversations, and chat history lives only on your device while the page is open. Messages sent to the assistant are handled by Cloudflare and Anthropic under their respective service policies. As with any online chat, don’t include sensitive details you wouldn’t put in an email.

Everything else

No cookies, no analytics, no tracking pixels, no ads, and no third-party scripts or fonts. Each page ships a Content-Security-Policy that blocks the browser from connecting to anything except this site’s own chat endpoint — so there is nowhere else for your data to go.