To-do list app https://ticktick.com/
Now has an open API, good job.
They say they have an API. Does this help?
Not sure if this is new, but I discovered this page: https://developer.ticktick.com/docs#/openapi Couldn’t find anything in recent changelogs or blogs from TickTick, so who knows when it came out.
Would it be possible to use that?