My name is Andrei and I am making mobile KeePass apps.
It all started in 2013 with BlackBerry PlayBook. It was a fine tablet, but it lacked apps. Conveniently, however, it could run Android apps and I knew how to make them. So I forked KeePassDroid and adapted its UI to look more native on the tablet. And people liked it!
In 2014, I learned how to make native apps for BlackBerry 10 OS (using C++ and Qt), and created a KeePass app from the scratch. The development did take a while, but KeePassB became one of the best apps in its class. Even though it was proprietary and sold at $4.99, the reviews were overwhelmingly positive.
Within a couple of years, BlackBerry collapsed and KeePassB became an open source app.
In 2017, I got an iPhone and was sadly surprised by the bare-bones MiniKeePass experience and deplorable design of KyPass.
So I learned Swift and made KeePassium.