Sign in
Password, or a passkey. Nothing else is asked for.
A passkey signs you in with your device's fingerprint, face or PIN. The form above is the fallback if this device has none. Type a password and the button switches to it. The username stays filled either way, so your password manager can offer the right passkey.
Set up two-factor authentication
Required once, then it takes six digits to sign in. Scan this with any authenticator app.
This is a new setup code. If you already added geodzk to your authenticator app, delete that entry and scan this one — the earlier code will never work, and it fails as though the clock were wrong.
Recovery codes — save these now
This service holds no email address for you, so these codes are the only way back in if you lose your authenticator. Each one works once.
This instance is not taking new accounts right now. Accounts are created by the administrator.
Your username becomes your namespace: your links live at
/l/<username>/…. You will set up two-factor
authentication next. No email address is asked for or stored.
Your password comes first. Where the six-digit code is usually asked for, the recovery code takes its place — and then it is spent.
Ten codes were shown once, when two-factor authentication was set up. There is no email address on file here to send a reset to; the codes are the way back.
T = 4 · 42 vertices · 120 edges · 80 triangles · 20 faces
T = b² + bc + c² = 4 fixes the solid, and the solid fixes every ceiling here. Nothing carries a tuned maximum, so the worst frame is arithmetic rather than a measurement. Randomness is allowed everywhere it costs you nothing, and nowhere it could cost you something.
- The reading planeWhat this is, what it keeps, and how to drive it without a browser.
- The APIEvery route, every error, and who may call what.
Tested in Blink, WebKit and Gecko.
- Blinktested by handChrome, Edge, Brave, Opera, Vivaldi, Android · Chrome 151 · 6 weeks agoEvery page, every theme, keyboard-only, print, and the backdrop.
- WebKittested by handSafari on macOS and every browser on iOS · Safari 18.6 · 6 weeks agoDriven by hand on macOS: sign-in, links, groups, passkeys.
- Geckotested by handFirefox, Tor Browser, LibreWolf · Firefox 154 · 6 weeks agoNext on the list.
- Goannanot tested yetPale Moon, BasiliskA Gecko fork that has diverged; no CSS nesting, and its own view of newer selectors.
- Servonot tested yetServo's own shellIndependent, and the one most likely to find something genuinely wrong in the stylesheet.
- LibWebnot tested yetLadybirdWritten from the specifications rather than from the other engines, which makes it a good check on whether this page is standard or merely popular.
- Flownot tested yetEkioh FlowIndependent, and used on set-top boxes.
- NetSurfnot tested yetNetSurfNo JavaScript worth relying on, so this is really a test of whether the pages work as plain documents. They are built to.
- Text-modenot tested yetLynx, w3m, LinksNo CSS and no script at all. A dead-link notice should still say what happened, which is the only thing that has to survive here.
Not tested means nobody has looked.