Chrome Extensions
Two browser extensions built on the same principle as the tools here: they do one thing, they ask for nothing, and they collect nothing.
The tools on this site solve problems you have once and then leave. An extension solves the kind you have every day — the setting you keep re-applying, the arithmetic you keep redoing. Different shape, same idea.
Jetlag
Keeps another time zone's clock in your toolbar, and converts any time to yours.
A second clock that lives in your browser toolbar, set to wherever the other person is. Click it to convert any time into yours.
If you work with people in another country you do the same arithmetic several times a day, and you get it wrong often enough to have been late to something. This removes the arithmetic.
Defaults for YouTube
Sets your view mode, audio language, subtitles, speed and quality on every YouTube video you open.
Applies your preferred view mode, audio track, subtitles, playback speed and quality to every video automatically — and gets out of the way the moment you change something by hand.
YouTube forgets your preferences constantly. If you always watch at 1.5x in theater mode with subtitles on, you are setting that again on every single video. This sets it once.
The same rules apply
Both extensions follow what the rest of the site does, because the reasoning is identical:
- No account. Install it and it works. There is nothing to sign up for and nothing to log into.
- No data collection. Neither extension sends anything anywhere. Your settings live on your device, and that is the whole architecture — not a promise about what is done with data, but an absence of any path for it to leave.
- No paid tier. There is no feature held back, no trial that expires, no upgrade prompt.
You can verify the data claim the same way you can verify it for the tools: Chrome shows every permission an extension requests before you install it, and lists them on the store page. If an extension asks for more than its job needs, that is worth noticing — for these two, or for anything else you install.
Why extensions and not more tools
Some problems cannot be solved by a page you visit. A time zone converter on a website is useful when you deliberately go looking for it; a second clock in your toolbar is useful because it is already there when you glance up mid-conversation. YouTube playback settings are the same — a page cannot reach into a video you are already watching.
When the problem lives inside another site, or needs to be present without being asked for, an extension is the honest answer and a web page is not.
Last updated September 19, 2026