I can support the developer when I have the cash flow but I can still use the product without worrying about 'pro' features expiring if I can't pay by a certain date.

Optional subscription or one-time support purchases: this is the best of both worlds. Synching with apple's native reminders means I can share simple lists with other iOS users immediately without requiring them to learn to use 'my' preferred to-do list app in order to share tasks.

Set up quick buttons to add or toggle commonly used tags, or priority, or postpone due dates or open URLs that are attached to the task. in addition to the simple one-deep categories I can have on iOS reminders, GoodTaks can index all items and list by priority, by due date, by tag or keywords contained (or not contained) in the task (and tags are of course customizable for everything), I can create lists of lists, or lists of lists with certain tags but not others, etc. Updates are frequent and responsive to user needs. Pulls apple calendar events into the to-do list view for easy reference when planning ahead. syncs easily across all my apple devices, meaning I can take advantage of all the native ways to add reminders - Siri's 'remind me about this', or remind me to call someone back when I can't take their call right away. I love that I can synchronize with iOS reminders.

Goodtask ios