Strongbox VS KeeWeb

I followed a similar path as you did about a year ago. Having tried a bunch of options, I can recommend strongly Strongbox - fantastic native apps for iOS and macOS, with your choice of sync mechanism (local-only is also a first class citizen), and it uses the KeePass file format so you can use your client of choice on other operating systems/no worries about lock-in. Good system integration and autofill extensions. I also appreciated that there was an option for a one-time purchase.

https://strongboxsafe.com

I've been wanting to spend more time trying out Strongbox[1], personally. It's only available for Apple (macOS, iOS, and iPadOS) devices, which rules out the 1% of the time I use an oddball Linux or Windows desktop, but it's a bit more reminiscent of old 1Password UIs with less of the dismissive attitude that I've gotten from 1Password's support team over the last couple years.

[1] https://strongboxsafe.com/

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Also some others worth mentioning are Dashlane, Elpass, Enpass, Keeper, Minimalist, mSecure, Passcodes, Passkeep, Passport, RoboForm, Strongbox, Zoho Vault.

KeePassXC on desktop with Strongbox on iOS (you need to roll-your-own sync). Strongbox is open-source and has a ton of features.

Strongbox Password Manager Extension Now Works in LibreWolf

Strongbox

Best KeePass Mac client: Also KeeWeb but as a standalone app

I prefer KeeWeb on Desktop (Mac, Windows and Linux) but I agree that keepass is the most flexible and secure system for passwords

Web access to keepass database: KeeWeb. It works fully in browser, so the only web server needed to push static content, after that set KeeWeb backened pointing to WebDAV to sync DB with other devices (Strongbox on iPhones or Keepass2Andorid for android). KeepassXC on Linux doesn't have native sync, but you can use wine to run original keepass which works much better and natively support synchronization over multiple protocols

KeeWeb is an open-source password manager that's compatible with KeePass. This cross-platform tool is available for browser and desktop and doesn't require any server or additional resources. Credit for this recommendation goes to techtornado.

To make Dropbox work in your self-hosted app, go to this Wiki page.

https://github.com/antelle/argon2-browser

Per their README it seems it’s implemented into “KeeWeb”.

KeeWeb is a free cross-platform password manager compatible with KeePass“

https://keeweb.info

Hey, great job. Have you seen https://keeweb.info/? It purses the same goal, compatible with KeePass, and already has features that you're going to implement. I bet you could've learned a lot from it, and who knows, maybe have become a contributor ;)