When comparing onlykey vs mSecure , the Slant community recommends mSecure for most people. In the question“What are the best offline password managers?” mSecure is ranked 24th while onlykey is ranked 27th. The most important reason people chose mSecure is:
mSecure offers syncing through cloud storage services such as Dropbox and iCloud and a possibility to sync locally over Wi-Fi if you opt not to use cloud storage.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Completely offline (separate hardware)
Pro Stores 2FA
FIDO U2F, Google Auth TOTP, Yubikey OTP.
Pro Can be used for secure messages with Keybase PGP
Pro Open Source
Pro Cloud & Wi-Fi sync
mSecure offers syncing through cloud storage services such as Dropbox and iCloud and a possibility to sync locally over Wi-Fi if you opt not to use cloud storage.
Pro Does not depend on the cloud
mSecure doesn't force backing up your passwords to their servers.
Cons
Con Can't autofill
mSecure won't automatically fill in forms, including login forms, like most other password management apps do.