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  "markdown": "Epsilla co-founder and former CEO; now HarnessRouter co-founder/CTO.\n\nRenchu (Richard) Song co-founded Epsilla, an AI agent platform, and is now co-founder and CTO of HarnessRouter, a unified interface for agent harnesses. Song was previously senior director of cloud engineering at TigerGraph and led the team that built its managed database service.\n\n- LinkedIn: https://www.linkedin.com/in/renchu-richard-song-a4099247\n\n## What Renchu builds\n\n- [Epsilla Vector Database](https://www.anchorterminal.com/tools/epsilla.md), graded F, 35.9/100, in Retrieval \u0026 vector search. Open-source (GPL-3.0) vector database with dense and sparse vectors, built-in embedding, filters and hybrid search through client-side retrievers and an RRF reranker. Epsilla co-founder and former CEO; now HarnessRouter co-founder/CTO, researched 2026-10-27.\n\n## Backed by\n\n- [Y Combinator](https://www.anchorterminal.com/investors/y-combinator/)\n\n## Questions\n\n### Who is Renchu Song?\n\nRenchu (Richard) Song co-founded Epsilla, an AI agent platform, and is now co-founder and CTO of HarnessRouter, a unified interface for agent harnesses. Song was previously senior director of cloud engineering at TigerGraph and led the team that built its managed database service.\n\n### What does Epsilla (founder now at HarnessRouter; merger reported on own profile) make?\n\nAnchor Terminal lists Epsilla Vector Database from Epsilla (founder now at HarnessRouter; merger reported on own profile). Open-source (GPL-3.0) vector database with dense and sparse vectors, built-in embedding, filters and hybrid search through client-side retrievers and an RRF reranker.\n\n### Who has invested in Epsilla (founder now at HarnessRouter; merger reported on own profile)?\n\nThe sources our research read name Y Combinator.\n\n### How are Renchu's tools graded?\n\nEpsilla Vector Database is graded F, 35.9 out of 100, on Anchor Terminal's benchmark, which scores every listing against the same checklist.\n\n## Sources\n\n- https://www.ycombinator.com/launches/J8t-epsilla-a-10x-faster-open-source-vector-database\n- https://www.ycombinator.com/founders/14642-richard-song\n- https://www.linkedin.com/in/renchu-richard-song-a4099247\n- https://www.epsilla.com/\n- https://www.epsilla.com\n- https://github.com/epsilla-cloud\n- https://x.com/epsilla_inc\n- https://github.com/epsilla-cloud/vectordb\n- https://www.epsilla.com/sla\n\nThese are the people building the tools we list, named for their public role in the company or project behind a listing, from public pages, with the date it was researched. They don't work for Anchor Terminal (our own team is on the about page, /about/#author). We show public roles, public profiles and what the listing pages show, nothing private. To correct something, send an about or a photo, or have a page removed, write to privacy@anchorterminal.com.\n",
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