AI app and agent builder from Engine Labs that ships apps on major models with a free ad-supported tier and hireable ready-made AI teams.
What it does
The site at backengine.dev now presents 'cto' by Engine Labs, a tool for building apps, agents and startups on top of leading AI models from Anthropic, OpenAI and others, with no API key required. It runs in secure cloud sandboxes, supports multi-agent teams with built-in web browsing, email and scheduling, and is extensible via MCP servers. A marketplace lets users hire or list ready-made AI teams such as engineering, marketing or content squads.
Core features
Build apps and agents on multiple AI models
No API key or credit card to start
Secure cloud sandboxes
Multi-agent teams with browsing, email, scheduling
MCP/skills extensibility (Linear, Sentry, Notion, etc.)
Marketplace to hire ready-made AI teams
Best for
→Prototyping apps and startups with AI
→Running multi-agent teams for engineering or marketing
→Hiring pre-built AI teams from a marketplace