Must have an android client,support mtls,support attachments and card layout.

ps: pls don’t suggest to save to local storage and sync that.

pls don’t suggest this app that cant do that but its great.

Anyways anyone aware of any app that can do that?

Nope, you seem to be well aware of the options available to you and there isn't any one single app that meets all of your requirements, so unfortunately we can't recommend anything at all to you, per your specific request.

You'll have to build it yourself either from scratch or by taking one of the existing open-source tools and adding the missing functionality.

Looking forward to your pull requests!

I don't knowvwhat mtls is, but Joplin has mostvof what you want. It does not have card layout native, but there might be a plugin for that.

Why mtls support specifically? You could use any web based notes app (with PWA) and have the web server / reverse proxy handle the mtls part.

i am not sure how to look mtls up reliably ... but overall my highest hopes in quality opensource notes apps are for anytype right now

I've been looking around for notes apps with similar criteria with the addition of a portable format (markdown prferably) and, ideally, the ability to add images directly from the camera. I landed on GitJournal and backed it with a self-hosted Forgejo server, but this can be any git server. This has the benefit of requiring an ssh key pair for access

I dont know about mtls, but Obsidian with the Self-Hosted Live Sync community plugin has end to end encrypted sync between any device. There are a ton of plugins to make it capable of doing whatever you want. I have it syncing between Windows, Linux, and Android currently.