The simplest, most joyful, project management platform
We use it as an upgraded version of 'Trello', which basically allows planning of many projects in many teams in a central place, and have an easy to use reporting sections
Flow doesn't try to solve the entire spectrum of Project Management problems, but the ones it does solve, it does very well. Flow, like the name implies, has a certain flow that directs you through your project management and reporting. If you like that flow, which is extremely simple and easy to use, then you could plan pretty complicated projects and tasks, in a big team, and make it a joy to use such a tool - which is very rare in this industry. Flow is also really good at making you focus on what's important by signaling and emphasizing tasks that you need to complete. It does so by simply knowing the due date for your tasks and then prioritizing it for you in a simple and focused manner.
Like every specific, non-generalized tool, it does what it does very well, but if you step outside of Flow's flow, it can become a hassle to use and all its benefits would go to waste, and then a different, more generalized tool will be more efficient.