I get your point, but I think the issue is terms like "Facebook app" and "Twitter app" have become popular and mean apps for those platforms.

Not to dilute your efforts at all, but something like "Buffer-like app" or "Buffer-style app" or "Buffer-esque app" would be more precise.

Anyway, congrats for doing this. Back when Buffer's pricing plan was horrible, I was almost tempted to do something similar. Since their reorganization, I've been happy with their pricing plan, but it's always great that open alternatives exist.

We certainly see some confusion from the "app" in our domain. We think of our name as "Buffer" rather than "Buffer app". So I think "an open source Buffer" would make a lot of sense, and might remove this confusion of whether it's something built as an app for Buffer. Love the thinking here, by the way :-)