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Repository App Lister
(lemm.ee)
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In some cases you will need to uninstall/reinstall if you have already installed from another store, like F-Droid. I'm only saying this because I don't have a good answer to your question, other than to go through app by app. Sorry.
Thanks. That's my main issue - trying to re-install apps from foss repos. If nothing is available then I guess - as you say, I'll just have to write them all down and go through them one by one. Not to even mention when I replace this aged phone.
At least Obtainium has an import/export feature of you ever replace your phone.
Good to know. Cheers.