How do I see which devices use my account?

Go to Settings → Account → Signed-In Devices. It lists every device signed in to your WitnessWork account and when each was last active, with "This device" marked. Tap another device to sign it out, for example a phone you sold or lost. Signing out ends that device's connection, but if WitnessWork on it still has your account, it signs back in the next time it's used. If you think someone else has your account, delete your Buddies data (Buddies Settings → Delete My Buddies Data) to get a new account and recovery key, then set up your other devices again. Settings → Account → Account Activity shows your account's history for the last 400 days: sign-ins and sign-outs, devices signed out from another device, your account sent to a new phone, backups deleted or downloaded, Buddies set up or its data deleted, and suspensions. "Signed out … to protect your account" means a device's sign-in was used again after it had been replaced, which can mean someone copied it; check Signed-In Devices for anything you don't recognize. Device names are encrypted so only your devices can read them, and WitnessWork's server doesn't keep locations, IP addresses, or anything you share. Both need the internet, and they appear once your account is set up.