Holochain 0.3.1 is the newest recommended release for you to build your hApps on. It comes with a raft of performance improvements and bug fixes, and not too many breaking changes. The happy news with this release is that validation is considerably more performant, hitting fewer dependency deadlocks. (There’s other big news that developers need to know about — read below.)
Read Article: https://blog.holochain.org/holochain-0-3-a-new-launcher-and-hc-on-mobile/