That question came up in the last thread about it, and the response was "email us:" https://news.ycombinator.com/item?id=28820881

While I admire their effort to do all the clouds, I would expect the actual code overlap between emulating the AWS APIs and Azure APIs would be infinitesimal and would likely benefit from a separate localstack-azure project

Or, actually, put another way: since localstack stood on the shoulders of the absolutely incredible moto library, I would find out if there is an equivalent for Azure and start there

Azurite is good for azure storage service emulation and they respond to issues with lightning speed. Aside from storage I’m not aware of anything

Quick edit: there is a cosmosdb emulator out there for windows. Last I looked (6 months ago?) there was not a Linux version (so no docker). If you’re in windows with wsl though not bad. Azure function core tools is also excellent for local dev.