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Vikunja - The open-source, self-hostable to-do app
(vikunja.io)
This is a most excellent place for technology news and articles.
Looks promising, but not having an iOS app is a dealbreaker for me.
It's available on smart phones, but you have to install it as a PWA.
It literally prompts you to install to your desktop, meaning it's had at least the minimum amount of effort spent to make a decent mobile experience. Did you try it?
A desktop is nice, but my to-do things get crossed off on my iPhone 99% of the day, so still not very useful