[Ruphin]

Hey chuyeow, nice to see you like Passenger.

The Open Source version of Passenger will always be our core product, and it will be maintained and developed just as it always has been.

Phusion Passenger Enterprise is a set of features added on top of the Open Source version, to add stability and deployment features to high performance applications. As Ninh posted earlier, we are working on a direct comparison table to make the differences more clear.

Because Passenger Enterprise is built directly on top of Passenger Open Source, both versions are always released in tandem. This means that Open Source 4.0 and Enterprise 4.0 will be released at the same time.