ticktick

Install command: 
brew install --cask ticktick

Name: TickTick

To-do & task list manager

https://www.ticktick.com/home

Cask JSON API: /api/cask/ticktick.json

Cask code: ticktick.rb on GitHub

Current version: 6.4.10,449

Requirements: macOS >= 10.15

Analytics:

Installs (30 days)
ticktick 308
Installs (90 days)
ticktick 835
Installs (365 days)
ticktick 3,573