Light and dark
Cobblr comes in a light theme and a dark one. Which you get is resolved from three inputs in a fixed order, so a shared screen and your personal account can each land where you want without fighting each other.
How the theme is decided
Three inputs, checked top to bottom. The first one that's set wins.
- This device's override. A hard light or dark lock for this one browser, stored locally and never synced. Use it to pin a shared wall display or one machine to dark even though your account default is light.
- Your account default. A light or dark choice saved to your account and synced to every device you sign in on. Left unset, it means "match the device".
- The device's OS setting. When nothing above is set, Cobblr follows the operating system's own light or dark preference, and follows it live if the OS flips.
So the resolved theme is the device override if there is one, otherwise your account default, otherwise the OS.
The quick toggle vs the account default
The always-visible toggle (the sidebar icon, the account menu, the command menu) flips this device. It's the fast "make this screen dark now". Flipping toward what your account would show here anyway releases the device lock, so the screen goes back to following your default; flipping away locks the device to your pick.
Your account default is the deliberate one, set under Profile then Appearance. Change it and it syncs to your other devices on next sign-in. Because a single-device person who only ever taps the toggle never sets an account default, Cobblr offers a gentle nudge to promote a device lock into the account default when the two have diverged.
Why two levels
A per-device lock and an account-wide default are separate needs. The lock handles the odd screen (a bright shop floor, a dim studio, a wall-mounted tablet); the default handles you, everywhere you sign in. Keeping them apart means setting one never quietly changes the other.
For forcing a specific look on a public display regardless of any of this, see The public board.