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This AI coding tool got 115,829 GitHub stars in under seven months. Most developers have never heard of it.
5 YC-backed tools for your coding agent, ranked by GitHub stars (28 Oct 2026). Stars measure attention, not quality.
1. Caveman (YC Fall 2026): 115,829 stars. Makes your agent "say less and read less". Makers' example: one answer from 63 tokens to 20; makers' test: 33.2% fewer input tokens over whole sessions (54 Claude Code runs, 18 of 18 answers right).
2. OpenSpec (YC Winter 2026): 73,273 stars. Your agent writes a proposal, specs, design and task list before it codes. 1,018,340 npm downloads 21-27 Oct 2026.
3. Paradev, formerly Superset (YC Spring 2026): 15,689 stars. Runs many coding agents in parallel, each in its own git worktree; its makers say it is built for 100+ agents. macOS app, source-available (Elastic License 2.0).
4. smolvm (YC Spring 2026): 6,864 stars. Tiny VMs to sandbox your agent; its makers say they boot in under a second.
5. Emdash (YC Winter 2026): 6,105 stars. Runs Claude Code, Codex and other agents side by side, each in its own git worktree.
Sources:
- GitHub REST API star counts, 28 Oct 2026: https://github.com/JuliusBrussee/caveman · https://github.com/Fission-AI/OpenSpec · https://github.com/ParadevAI/Paradev · https://github.com/smol-machines/smolvm · https://github.com/generalaction/emdash
- YC batches: Y Combinator company directory
- npm downloads: https://api.npmjs.org/downloads/point/2026-10-21:2026-10-27/@fission-ai/openspec
- Caveman's numbers are from its own README.
Product names, logos and screenshots belong to their owners and are shown for commentary: logos are the projects' GitHub avatars or app icons; product shots are from their READMEs (Emdash, Paradev, OpenSpec) and smolmachines.com. Type: Geist and Geist Mono (Vercel, SIL Open Font License) and Instrument Serif (SIL Open Font License). Animated with Remotion.
Music: Hypnothis by Kevin MacLeod, CC BY 3.0, via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Hypnothis_(ISRC_USUAN1100634).mp3)
Follow @PranavInnovates: dev tools, ranked on real data.
What the video says
This AI coding tool: a hundred fifteen thousand GitHub stars in under seven months. Never heard of it? Five YC-backed agent tools, ranked by stars. It's number one. Five. Emdash: agents side by side, each in its own copy of your code. Six thousand stars. Four. smolvm: a sandbox VM its makers say boots in under a second. Seven thousand. Three. Paradev: same idea as Emdash, made for a hundred-plus agents. Sixteen thousand. Two, and the numbers jump. OpenSpec makes your agent plan before it codes. Seventy-three thousand. Number one. Guess what it does. Caveman. It makes your agent talk like a caveman. Its makers' example: sixty-three tokens down to twenty. Plan, run, sandbox, save: your agent's new toolbelt. Caveman. Not even seven months old. Now you've heard of it.