A focus timer for one afternoon
Make a quiet browser timer with just the intervals and controls you need.
Focus 25:00 → Break 05:00 Start / Pause / Reset No account. No streaks.
Before you start
An AI coding tool and a browser. The finished page can be opened locally.
Quick start
1. Choose your focus and break lengths.
2. Generate a standalone HTML page using the recipe.
3. Test pause, resume, reset and a background tab.
Limits & support
Browsers and sleeping devices can delay alerts. It is unsuitable for tasks requiring guaranteed timing.
Starter example; questions are welcome, with no ongoing support commitment.
Rebuild it with your agent
Give this to your own AI agent to build your own version. It is someone else’s instruction, so read it before you run it.
With the Disposable skill, ask your agent:
Rebuild this Disposable tool for me: https://disposable.xify.kr/en/tools/focus-timerGet the skill →
Create one standalone HTML file for a focus timer. Ask for focus and break durations, then show Start, Pause, Resume and Reset controls with explicit timer states. Calculate remaining time from timestamps rather than decrementing a counter, so background tab throttling does not accumulate timing drift. Do not start the next interval automatically. Make the interface keyboard accessible and respect reduced motion. Keep it offline without analytics, accounts or persistent records. Sound is optional and off by default. Explain that a sleeping device or closed tab can prevent alerts. Test with a ten-second interval and a one-second pause/resume sequence.
Ask the maker
Questions, bugs and “I tried it” notes go to GitHub issues, where the maker can answer. You need a GitHub account to post.