Interviews you about your project, plans the whole build as numbered spec-driven prompts, then feeds them to Grok Build one at a time while it watches.
Plans and launches Cursor Projects with an outer loop / inner loop setup: a Project coordinator owns the build, and an Outer Loop bot feeds it context packs.
App-builder teammate that takes your idea from spec to a tested, working build with a solid agent harness, and asks before anything is pushed or deployed.