Is the compose runtime artifact compatible with iOS targets?

Only if you build it yourself

yeah.. the project im experimenting w/ leverages JB compose plugin, shared viewmodel, etc w/ compose web FE, compose android, compose desktop (not sharing any compose components across targets at all). Was curious how runtime would behave for iOS target and no dice

Execution failed for task ':common:compileKotlinIOS'.
> Could not resolve all files for configuration ':common:iOSCompileKlibraries'.
   > Could not resolve org.jetbrains.compose.runtime:runtime:1.0.0-beta6-dev446.
     Required by:
         project :common

For native you also need to build the compiler plugin yourself

@jw Will ‘Redwood’ , which you mentioned in your blog, be open source in the future?

Probably, yes. It's built in its own repo so that open sourcing would be easy.