I really like their Android and web clients. I don't use a lot of advanced features, but find it to be very responsive and handles everything I do very well. Prior to switching to Fastmail, I used to have my mail forwarded to Gmail but much prefer Fastmail's clients to Gmail now, which surprised me.

I like Fastmail's app but I have different Fastmail for work and home. I don't want to connect them and I don't want to switch between them in one app. For now I have Fastmail for work and I use Apple Mail for home, but in the past I have used K9 Mail for this sort of situation.

I wonder why it's not permitted to have multiple instances of an application with different configurations.

> Ha, so it's better than Fastmail's own Android client?

(This a biased personal opinion not based on a real experience)

Judging from thr screenshots it is the same framework used by many Android apps (most notably for me by Nextcloud) and it is really sucks.

The current FastMail app is sadly dependent on gapps (AFAIR FireBase dependency) but othereise it is just an SPA in the guise of an Android app which works marvelous... till you have the connectivity.

If you need an offline access to your mail then the FastMail app isn't for you.

I use K9 because Fastmail's client is closed source and not on f-droid (I don't have a google play account). It works ok for me as a secondary/occasional email client (main one is on laptop). It does miss notifications. I have heard somewhere that the only way to get reliable notifications involved using a google play service, which I didn't want to allow. I usually have mobile data on my phone disabled anyway, unless I am actually about to use it. But, I think other people use their phones a lot more than I do. I'm in front of a real computer almost all the time, so the phone is just in case I have to check something while away.

Fastmail "app" is just a webpage.