A significant portion of the membership fee actually goes towards building the strike fund. The larger the strike fund, the more pressure we can apply to the employer in the event of a strike. A strong strike fund allows us to support members financially during a strike and increases our bargaining power.

ulogger client is not cross platform (android,fdroid) for the logger but it can logg to any webserver you are in control of to ulogger-server : https://github.com/bfabiszewski/ulogger-server

I installed it from fdroid, is there a difference between play store and fdroid version?

Tasks.org on f-droid is great for this kind of use.