Amazing app, that is almost perfectly what I've been looking for! I considered writing my own app, until I came across yours!
I would love to see you add a "Cost" attribute to tasks, and display the sum of subtasks for any subtasks that have them.
This would make integrating shopping lists as tasks so awesome. I typically have Shopping as the first task of any project, and having a quick total of expected costs would be amazing!
It would look something like this: Build a sailboat ($1230) Shopping ($1230) Lumber ($1000) Hardware ($230) Build the boat Set up work area Do some other stuff Do some more stuff Go Sailing!
+1
Géza Molnár @booing :profile:, Apr 27, 2020
+100
Phil, May 5, 2020
I would re-use tags mechanics. Just add an ability for adding values: Task 1 - Tag1:Value1 Task 2 - Tag1:Value2 So, each tag works as a custom field. The cherry on top of the cake: when filtered by such tag, show (Value1+Value2) as a label on top menu bar.

Diego Softcontrol, Aug 15, 2017
Hi Damien, Great. Happy to hear you found the tool you are looking for! 😃 I believe what you and @i.meisen are suggesting is the ability to type in the $ of each task / subtask and sum them up when selecting them. We shall consider it.
Crystal, Aug 11, 2017
+1 Do you have budgeting, and more general number-aggreagation on you roadmap? When? This topic is from 2017 - "We will take it into consideration." !
Géza Molnár @booing :profile:, Apr 27, 2020
+1! A cost attribute would be great!
Ivo Meisen, Aug 11, 2017
Hi Diego, Nice idea! And thanks for the mockup screenshot. 😃 We will take it into consideration.
Crystal, Aug 15, 2017
Good idea, but I would go for a more general approach so that we could sum durations, space-requirements, people, or anything else we desire.
Oscar Jonsson, Aug 12, 2017
Hi Oscar, Got it. If you can provide us with a mockup of how you want to see the sum, that would be nice. 😃
Crystal, Aug 14, 2017
I suggested a similar or related idea of merge fields yesterday!
Dave Spathaky, Aug 11, 2017