The agent index
A field guide to 70+ autonomous AI agents and agent frameworks: what they cost, where they run, who's winning, and what each is good for.
How to read this
Popularity meters (1–5) blend GitHub stars, adoption, funding and revenue, and press coverage — they're a directional read, not a benchmark. The Agent / Framework / Builder / Platform badge marks the most important distinction in the space: whether a tool does the work for you, or helps you build something that does. Several frameworks (LlamaIndex, LangGraph, CrewAI) are libraries, not agents you can "run" on their own.
Caveats
Every price and figure is a June 2026 snapshot in a market that re-prices monthly — verify on official pages before buying. Star counts and revenue figures vary across sources and are given as ranges where they conflict. Security and governance remain the dominant unsolved problem: documented prompt-injection and rogue-action incidents (OpenClaw, Agentforce, Copilot Studio) are real, so never grant an agent live credentials or production access without sandboxing and a kill-switch. A handful of entries are volatile — Windsurf became Devin Desktop, Roo Code was archived into Kilo Code, and Anysphere (Cursor) agreed to be acquired by SpaceX.