Mopidy uses Semantic Versioning, but since we’re still pre-1.0 that doesn’t mean much yet.
We intend to have about one feature release every month in periods of active development. The feature releases are numbered 0.x.0. The features added is a mix of what we feel is most important/requested of the missing features, and features we develop just because we find them fun to make, even though they may be useful for very few users or for a limited use case.
Bugfix releases, numbered 0.x.y, will be released whenever we discover bugs that are too serious to wait for the next feature release. We will only release bugfix releases for the last feature release. E.g. when 0.14.0 is released, we will no longer provide bugfix releases for the 0.13 series. In other words, there will be just a single supported release at any point in time. This is to not spread our limited resources too thin.