When comparing Padlock vs Buttercup, the Slant community recommends Buttercup for most people. In the question“What is the best cross-platform password manager?” Buttercup is ranked 10th while Padlock is ranked 23rd.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Cross-platform
Supported on Android, iOS, and any platform that Google Chrome runs on.
Pro Completely open source
All source code is contained at https://github.com/maklesoft/padlock, so users can examine exactly what the program contains.
Pro Simple and easy to use
Stripped down version of most other password managers, containing only the ability to save passwords.
Pro Pretty
User interface built using Polymer (https://www.polymer-project.org/1.0/).
Pro Can be installed with home brew
Pro Open source
There's a large base of developers who work on improving the software.
Pro Import other formats
Import passwords from other password managers including 1Password (.1pif), KeePass(.kdbx), and LastPass (.csv).
Pro Good UI
Pro It's free
As in beer.
Cons
Con No pin code or fingerprint login on iOS and Android
You must type out your entire master password to enter the app each time on mobile.
Con No auto-fill in browser
Chrome app does not contain the ability to auto-fill password boxes.