Or even just a good open source paid app?
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tasks.org is pretty excellent
I read that title as “Is there a FOSS alternative to apps like TikTok?”
https://alternativeto.net/software/ticktick/?license=opensource
Super Productivity has some integration limitations, but generally been working great for me.
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Try Vikunja. Project Segfault has an instance, but you can host your own if you want.