When comparing oneSafe vs LessPass, the Slant community recommends LessPass for most people. In the question“What is the best cross-platform password manager?” LessPass is ranked 11th while oneSafe is ranked 41st.
Ranked in these QuestionsQuestion Ranking
Pros
Pro iOS, Android, MacOS native support
Pro No monthly subscription
Pro Sync between devices via Dropbox possible
Pro Easy to use
Pro Open source
Pro Really platform-free
Works everywhere, in any device that can run javascript.
Pro Doesn't store passwords
If it's not stored, it can't be stolen.
Cons
Con No Windows client
Con iCloud sync shaky
The iCloud sync only works like 98%. Customer service seems aware and recommends DropBox sync. Not a satisfying situation though.
Con No Linux client
Con Deterministic
Deterministic password managers have many drawbacks.
Con Cannot store existing secrets
Existing secrets (aka passwords) cannot be stored with deterministic password managers. In order to use LessPass effectively, you will need to change your password on every site.
Con Easily cracked with exposed/compromised master password
Since anyone can use LessPass with the same parameters as you, all they need is your master password (which could be obtained through keylogging or numerous other methods) to gain access to every one of your site passwords.