My experience with Blue is extremely positive. Many project management systems are inflexible and have overly complex interfaces.

Blue offers a simple but effective user-friendly interface with easy import, export, and API functions to meet your needs.

Here is an example: no project survives with constant rescheduling, so most project management systems reschedule based on task duration. This doesn't apply to me because my schedule depends on the effort required for tasks and the availability of resources. For example, a project DBA may only work part-time and have pre-scheduled vacations.

Using Blue I can export tasks, schedule them with my algorithm and re-import them. To be honest, I still haven't implemented it, but according to the documentation it is possible, differently from other solutions.