Q: What is the 20-20-20 rule?

It is a rule recommended by optometrists: Every 20 minutes spent using a screen, you should try to look away at something that is 20 feet (6 meters) away from you for a total of 20 seconds.

Q: Why is it free?

I built this tool for myself because existing apps were too complicated or required installation. I decided to share it for free.

Q: Does it work offline?

Yes! Once the page is loaded, it works entirely in your browser using JavaScript. No data is sent to any server regarding your usage.