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Managed to find one; mrvladus/Errands. It's Linux-only, and it's mostly consistent with how tasks.org does stuff[1]. It supports CalDAV, though non-NextCloud providers aren't guaranteed to work. ...
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#1: Initial revision
Managed to find one; [mrvladus/Errands](https://github.com/mrvladus/Errands). It's Linux-only, and it's mostly consistent with how tasks.org does stuff[^2]. [^2]: There's two major differences: 1. Errands supports task colours that tasks.org doesn't seem to support. They aren't cleared by tasks.org when modifying, they just aren't rendered in tasks.org. As far as compatibility goes, that's not the worst option 2. Tasks.org supports recurrence, while Errands does not. I assumed this was a CalDAV feature and not an app feature, but I was wrong. The tasks still complete as normal when done from Errands, they just aren't recreated or modified as the recurrence from tasks.org called for. Neither of these are dealbreakers for me (and recurrence wasn't explicitly mentioned in the requirements anyway, and having seen the pool of available task apps with CalDAV support, that requirement further complicates finding apps), but it's worth keeping in mind. It supports CalDAV, though non-NextCloud providers [aren't guaranteed to work](https://github.com/mrvladus/Errands?tab=readme-ov-file#sync). It worked fine with Baikal after tweaking the URL[^1], and that's good enough for me. Does seem like supporting other CalDAV providers is a goal, and they seem to be further along than most of the potential alternatives that haven't implemented anything yet. Instantly picked up my calendars once I synced manually, and it does support task nesting: ![Screenshot showing the example task list with nesting working fine in Errands](https://powerusers.codidact.com/uploads/dcgmjyv7557anzxyzv08ku4b6p9s) [^1]: I had to use the URL `https://caldav.{domain}/dav.php/calendars/` to get it to work. Just using the base URL did not work, but many of the calendar apps seem to use various different URLs. There's an [open issue](https://github.com/mrvladus/Errands/issues/309) for it, but it's extremely minor once you know the trick.