By default your board lives in one browser. Turn on sync and your phone, laptop, and any other device share the same board through one private folder on GitHub. It is free, it stays private, and it doubles as a backup. Here is the whole thing from zero, no GitHub account needed to start.
GitHub is the service that will hold your board. An account is free. If you already have one, skip to step 2.
Create a GitHub account →Pick a username, email, and password, then confirm your email. That is all this step needs.
A repository is just a private storage space. Yours will hold one small file, your board. Nobody but you can see a private repo.
Create a new repository →On that page:
punchlist-board.Note the name at the top of the new repo. It reads your-username/punchlist-board. You will paste that into the app.
The app needs permission to read and write that one repo. A fine-grained token gives it exactly that, and nothing else.
Create a fine-grained token →punchlist and any expiration you like (you can always make a new one).github_pat_.repo checkbox. It is simpler but grants broader access.Open Punchlist, open the sidebar, and expand the Sync section in Settings.
your-username/punchlist-board. A full repo link works too; the app tidies it.Within a few seconds it shows Synced with the time. Your board is now saved to your repo.
On each other device, open Punchlist, go to Settings › Sync, turn it on, and enter the same repository. For the token you can reuse the same one, or make another the same way as step 3.
From now on every change on any device lands in the repo as a saved version and shows up on the others. Open the app, and it pulls the latest before you start.
Settings → Sync lists every device that has saved to this board, newest first, with the name you gave it. That list is how you tell them apart when two devices disagree, which is why naming a device is required before it can sync.
Hover a device in that list and press the × beside it. It disappears from the list on every device on your next sync, and Ctrl+Z brings it back if you missed.
This is not the same as revoking access. The list is a record of who has shown up, not a permission list. A device that still has your token rejoins the list the moment it syncs again, and it can still read and write your board in the meantime.
Access comes from the token, so that is what you take away. There is no way to revoke one device without revoking them all, because they share the token.
The device you cut off keeps the copy of the board it already had, sitting in its own browser. Nothing reaches across and deletes it. If that matters, open the app on that device and use Settings to clear it, or delete the file.
A lost or wiped device cannot sync, so it stops appearing as recently seen and does no harm. Remove it from the list to keep things tidy, and rotate the token if the device is somewhere you would rather it was not.