multiple databases files (vaults in 1Password parlance).folders, icons and tags, including getting web icons from web sites.password generator (with the exception of dictionary-based memorable-word passwords that 1Password generates).

KeeWeb has a slightly quirky UI but it's got most of the features I need: Mono is an open source, cross-platform implementation of the Microsoft. KeeWeb is based on KeePass which is open source and supports Windows and macOS with Mono. For other platforms including iOS and Android, it can be run from a single HTML file totally offline, without any Internet connection and does not send data outside the browser. KeeWeb has a desktop app for Windows, macOS and Linux. So I started looking for alternatives, and stumbled on KeeWeb over at the Electron Apps page. But it too has various constraints, for example, it can export / import data from the desktop version, but not the iOS version, instead requiring a subscription to sync ($39.99 per year). I also tried Dashlane, which also looks great and is easy to use.

From iOS I cannot export / convert data.

I doesn't sync iOS with Windows as I do not wish to use Dropbox.

The macOS or Windows version is expensive but one-time ($64.99).

I have 1Password (the Pro IAP for iOS costs $9.99 as of writing) and it has lots of great features like templates, web site icons, Touch ID, iCloud sync with multiple devices, etc. I discovered KeePass, KeeWeb and MiniKeePass, all open source. I've been a long time iOS 1Password user, but recently started looking at alternatives.

Keepass on ios