Since I first started using GTD, I always bounced between Todoist, Microsoft ToDo, Google Tasks, TickTick and now NirvanaHQ.
Nirvana lacks some features you would find in others task managers, but there's one thing I couldn't find anywhere else
(within apps that run on Windows and Android), which is start dates.
I've messing around with different ways to deal with it on Todoist or TickTick, but it always ends looking too complicated, while on Nirvana is very simple and straight forward.
(I know TickTick has start dates, but it works more like you were creating a calendar event, instead of "hide until this date", and it requires the task to have a deadline).
Nirvana also lacks reminders, but as I have learned the hard way while using Todoist, reminders doesn't work for me because, most of the time, I just swipe them off or just forget about it until it's too late.
The biggest downsides of Nirvana in my opinion are:
- Lack of quick capture on mobile;
- UI design, which doesn't look clean or pretty as Things 3 or Todoist;
- Very slow development, to a point where I always wonder from time to time, "what if they shut down tomorrow?".
As I'm writing this, my task app of choice is Todoist (since I've some months left on my yearly subscription), but I'm considering going back, since I also bought a Nirvana HQ lifetime subscription back in Feb when I tested it for the first time.