Epsilla
A platform to build AI agents that know your company's specific documents and data, plus a newer tool (HarnessRouter) that lets an app plug into several different AI coding agents through one connection instead of wiring each one up separately.
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Description
Building a chatbot that actually knows your company's internal documents — not just generic web knowledge — usually means gluing together a vector database, a retrieval pipeline and a model, then maintaining all three. Epsilla started as exactly that infrastructure (a vector database) and grew into a no-code platform for building these "vertical" AI agents, then added HarnessRouter in July 2026: a single API that lets a developer plug in multiple sandboxed coding agents (like Codex, Claude Code, or Hermes) instead of integrating each one from scratch.
Epsilla is a Y Combinator-backed, NVIDIA Inception member company offering a no-code AI agent builder with drag-and-drop RAG (retrieval-augmented generation), enterprise multi-tenancy, and flexible deployment (SaaS, on-premise, private cloud). Its underlying vector database is open source (874 GitHub stars, C++, GPL-3.0). Pricing runs from a free tier (10M vector storage, 50 messages/month) through Starter ($29/mo), Professional ($249/mo), an "AI Concierge" tier at $2,499/mo, up to custom Enterprise, plus per-seat and per-GB add-ons. The company is SOC 2 Type 1 certified and targets manufacturing, healthcare, legal, financial services, construction and publishing verticals.
💬 Our review
The short version: if you need to build a chatbot or agent that's genuinely grounded in your company's own documents rather than generic web knowledge, Epsilla's no-code RAG builder gets you there without hand-rolling a vector database pipeline yourself.
Epsilla's strongest asset is that its vector database is open source and has real developer traction (874 GitHub stars) — you're not locked into a black box, and can self-host the core if the SaaS pricing doesn't work out. The pricing ladder is the weak point: a reasonable $29-$249/month range suddenly jumps to $2,499/month for the "AI Concierge" tier, a gap that will confuse a lot of buyers trying to budget, and the newer HarnessRouter product (launched July 2026) is too fresh to have a real production track record yet. Against Pinecone or Weaviate — both cheaper if you're comfortable building your own retrieval pipeline — Epsilla's value is specifically the no-code layer and enterprise governance on top; skip it if you're happy writing that plumbing yourself.
💰 Pricing
📊 Global score
🤖 AI-enriched data
Free : $0/mois (10M stockage vectoriel, 50 messages/mois). Starter : $29/mois. Professional : $249/mois. AI Concierge : $2 499/mois. Enterprise : sur devis. Add-ons : $12/siège, $2/app, $18/GB.
Pros
Base vectorielle open source (874 étoiles GitHub) sous option entreprise
Backé par Y Combinator, membre NVIDIA Inception, certifié SOC 2 Type 1
Constructeur no-code de RAG, pas besoin d'assembler soi-même la pipeline
Déploiement flexible (SaaS, on-premise, cloud privé)
Cons
Grille tarifaire complexe avec beaucoup de paliers et d'add-ons séparés
Palier Professional à $249/mois puis saut à $2 499/mois pour AI Concierge — écart énorme
Marché des bases vectorielles très concurrentiel (Pinecone, Weaviate)
HarnessRouter est un produit très récent (juillet 2026), peu de recul