Sim1h is a new way for devs to build, run, test and get user feedback on their hApps before lib3h is done. It also enables us to work in parallel with a full Holochian stack on small chunks of lib3h and then plug them in as soon as they’re tested, debugged, and ready. Scroll down to see how easy it is to get started with sim1h.
Read Article: https://blog.holochain.org/simulating-that-pesky-internet/