A long long time ago Unity used to include an API History with the script reference. It was pretty basic but a great resource to discover new APIs that were added and for keeping a watch on APIs that got removed. Unfortunately, starting with Unity 5.1, the history was no longer updated and later removed. I always wanted to have a replacement but all the tools I tried were hard to use or platform restricted. Inspired by rn-diff-purge, I created a replacement. A GitHub repository that has branches for the latest major versions that contain the decompiled public API (currently only from UnityEngine.dll): https://github.com/sttz/unity-api-diff Using GitHub's compare feature, it's possible to compare the API between arbitrary Unity versions. It's still only a rough proof of concept but I hope it's already useful to some!