> 0 dependencies
If bundling your devDependencies at compile time counts as "0 dependencies", nothing has any dependencies. In this case, the whole thing's built on electron - all of chrome's rendering engine is quite the dependency. The uncompressed Windows version is 137 MB on disk. Fatter than most any app should be.
Also mutiplatform as KeePassXC, built on Electron. Even though it is built on JavaScript, it has 0 dependencies[1].
And the author responds well on external feedback/contributions[2].
It does support KDBX4[3].
[0]: https://keeweb.info/
[1]: https://github.com/keeweb/keeweb/blob/c651343f80f4f3d41c7d64...
[2]: https://github.com/keeweb/keeweb/issues/104
[3]: https://github.com/keeweb/keeweb/issues/326