I've used Appigo's ToDo app for about 12 years (with Toodledo at first). It's had problems over the years, but in general it's been a good subscription choice. There's a fairly hard data lock (maybe SQLite?) but manual reentry is feasible albeit annoying.
Lately, however, ToDo has been more ragged. A recent server side change induced a date bug (time zone?) that in turn showed me I was using a macOS app last updated in 2016. It appears to have been abandoned on the Mac App Store. When I went to Twitter I found Appigo's account was closed years ago for violating TOS. Eventually I found I could download a current version of their other App Store app from their web site.
At the moment the app is more or less working again, though parts of the macOS app UI are kind of weird. I figure there was some violent ownership transition with lost dev passwords in Appigo's history (maybe they got ransomwared?).
I decided to go shopping again. I'm looking at:
- Apple Reminders: hard data lock and I have to upgrade from Mojave to get to latest version (not happening).
- Google Todo: this is one hell of a weird product. WTF is their web strategy? Tied to Gmail? Tied to Calendar? At least there's data export.
- OmniFocus: poor Omni is in some disarray ...
- Microsoft To Do
- There are classic Outlook Tasks. I'll call these TasksClassic. TasksClassic was excellent in many ways, including, once upon a time, great import/export options and lots of view flexibility (I like to sort by last modified!). Unfortunately it's dead, just barely hanging on in the current desktop app with some degree of synchronization with the new product.
- There's the new Wanderlist-based product variable called Microsoft To Do and ... Outlook Tasks (name reuse!). I'll call these TasksW for Wanderlist.
- There are no great task managers for the iPhone - but there's hope for 2011: My current task list started out on the Palm III and has migrated many times. I probably have uncompleted tasks from the 1990s. I think we're coming to the end of that data migration though. Note from 2010: "Google might finally provide an API for Google Tasks, allowing iOS client development."
- My ancient spreadsheet on migrating from Palm to iPhone - I think I used Outlook Tasks as part of the migration process, or maybe even Microsoft Access. Alas, too long ago. Painful though.