I have been using Todoist for a few years in the free version and it's certainly an app that I couldn't live without anymore. I use it to share some work projects with team members, manage and solve tasks, or keep track of activities to then include in the reports to be delivered to clients. I find it simple, intuitive, always well-functioning and updated. I have also had the opportunity to try the paid version, but for my uses it turned out to be too expensive compared to the actual use I made of the premium options. I hardly think I will be able to find a better alternative than this. The only missing feature is perhaps a real integration with Apple's Calendar app.
