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Does anyone know which parts are open source and which parts are proprietary? Discarding the obvious hosting service.

For example: is the storage layer, mentioned in the landing page, open source?

I'm tempted to use it, even as a hosting service.

The language and all the libraries are open source. The storage layer API is open-source as well though the implementation is proprietary, as is the implementation of other parts of Unison Cloud (like the part that actually hosts your Unison code on AWS).

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