Basically, KeePassX is maintained by one person and hasn't seen activity in quite a while. keepassxc is a community fork, they continue development, and merged various bugfixes as well as new features.
Additional Features according to project page: [2]
* Auto-Type on all three major platforms (Linux, Windows, macOS)
* Twofish encryption
* YubiKey challenge-response support
* TOTP generation
* CSV import
* Command line interface
* DEP and ASLR hardening
* Stand-alone password and passphrase generator
* Password strength meter
* Using website favicons as entry icons
* Merging of databases
* Automatic reload when the database was changed externally
* KeePassHTTP support for use with PassIFox in Mozilla Firefox, chromeIPass in Google Chrome and Chromium and passafari in Safari.
Basically, KeePassX is maintained by one person and hasn't seen activity in quite a while. keepassxc is a community fork, they continue development, and merged various bugfixes as well as new features.
Additional Features according to project page: [2]
* Auto-Type on all three major platforms (Linux, Windows, macOS)
* Twofish encryption
* YubiKey challenge-response support
* TOTP generation
* CSV import
* Command line interface
* DEP and ASLR hardening
* Stand-alone password and passphrase generator
* Password strength meter
* Using website favicons as entry icons
* Merging of databases
* Automatic reload when the database was changed externally
* KeePassHTTP support for use with PassIFox in Mozilla Firefox, chromeIPass in Google Chrome and Chromium and passafari in Safari.
* Many bug fixes
[1] https://news.ycombinator.com/item?id=13468261 [2] https://keepassxc.org/project