This device
What stays here
The application does not intentionally transmit fold selections or margin-note contents. They are stored unencrypted in this browser under the disclosed keys. Hosting infrastructure may receive ordinary request metadata. Do not store secrets.
Currently on this device: 0 folded sheets, 0 notes.
mc.folded
Which sheet ids are folded on this device.
mc.notes
Margin notes keyed by sheet id.
Mechanism: this browser’s localStorage, keys mc.folded and mc.notes. Not encrypted. Readable by anyone with this profile, and by any future script on this origin. No accounts. No third-party analytics are shipped by this application; a host or CDN may still log requests. Clearing removes those two keys and leaves the atlas itself untouched.