Five Chrome tools · nothing leaves the device
Decide what the browser gets to do.
Hold a class open and shut everything else. Keep a site from loading at all. Take the feed out of YouTube. Count where the hours actually went. Five small tools, each one running on the machine it is installed on.
Free while in beta · no card, no account
Session
Science, Tuesday
Tue 4 Mar
- On task
- 58 min
- Away
- 2 min
- Left the class
- 3×
The tools
One job each.
OnTask
Only the class, for the length of the class
Allow only the sites a class needs, for as long as the class runs.
NotNow
Block the noise, keep the focus
Keep chosen sites from opening at all, behind a PIN only you know.
Untube
A quieter YouTube
Strip Shorts, comments and the endless feed out of YouTube.
Unplay
You decide what plays
Block particular videos, channels or title words on YouTube.
Tallied
Your time, tallied
Count how long you spend on each site, today and this week.
On your device
Four things you can check yourself.
“Private” is the easiest word in software to write and the hardest to verify. So here is the version you can test in an afternoon, instead of the version you have to take on faith.
- Zero requests
- Open DevTools and watch the Network tab while a session runs. The tools reach no server, because there is no server for them to reach.
- There isn't one
- No sign-up screen exists in any of the five tools. There is no email address of yours for us to lose.
- Uninstalling is enough
- Chrome erases extension storage along with the extension. No copy survives somewhere else, because no copy was ever made.
- Every field is listed
- Each tool's policy names exactly what it writes to your browser — down to the hashed PIN and the hostnames in a report.
Network
Account
Deletion
Disclosure
And the limit, said plainly: an extension guards one browser on one machine. A different browser, a different profile or a phone is outside its reach. These are help, not a guarantee. Read the full policy.
Writing
Notes for parents, not developers.
19 Aug 2026
How to block websites during an online class (without blocking the class)
A blocklist goes stale the moment a new site appears, and most blockers break Google sign-in. Here is the approach that actually holds for a 45-minute lesson.
12 Aug 2026
Screen time numbers are mostly lying to you
Most trackers count a tab being open. That is not attention, and the gap between the two is where the useful information lives.