I just discovered this and it's amazing! And for some comments I've read about privacy: the database is stored in your devices, they don't have access to them. Synchronization is done between your devices.
And the 2FA included is a HUGE +++ for me
I remove a star because after resume from sleep on my Mac it uses a lot of CPU for no reason. I hope they fix it soon.
Response for the comment saying they don't give information about where data is stored on their FAQ, it's literally the second answer they have there: https://myki.com/faq/

Myki stores your passwords and sensitive data locally, on devices you have Myki installed on. The Myki app acts as a vault that stores an encrypted copy of your passwords and sensitive data. Your passwords are not stored in the cloud. This makes it extremely difficult for hackers to gain access to your accounts.