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Biel.ai

Source-linked AI assistant for technical docs — Docusaurus, MkDocs, Sphinx, plus a docs MCP server

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paidThree published self-serve tiers with a 14-day free trial requiring no credit card, and unlimited dashboard seats on every plan — Biel does not charge per seat. Starter is $50 per month (save $100 annually): 500 indexed pages, 2,000 interactions per month, web chatbot and search. Professional is $150 per month (save $300 annually): 3,000 indexed pages, 10,000 interactions and MCP access. Business is $400 per month (save $800 annually): 10,000 indexed pages, 25,000 interactions, MCP and API access, and advanced AI models. Enterprise is contact-priced for custom quotas, SLAs, DPAs and dedicated support. All plans default to GPT-5 mini and Claude Haiku; Business and Enterprise also include GPT-5 and Claude Sonnet. Qualified open-source projects can use Biel.ai free, and qualifying startups get three months free on a self-serve monthly plan. The trial includes 1 project, 500 indexed pages and 2,000 interactions.View full pricing →

About Biel.ai

Biel.ai is an AI answer layer for technical documentation, aimed squarely at docs-as-code teams rather than at marketing sites. The distinction shows in what it indexes: OpenAPI specs, code blocks, configuration examples and error messages alongside prose, which is the difference between a bot that can answer 'why am I getting a 401' and one that can only find a page titled 'Authentication lifecycle'. Every answer is source-linked back to the page it came from, which matters in a category where a confidently wrong technical answer costs a reader hours. There are two surfaces for readers — an AI search that finds pages when you know what you are looking for, and Ask AI for source-linked answers when you do not — and a third for the people who maintain the docs: a log of questions Biel could not answer, grouped by topic, which converts reader demand into a writing backlog. Source integrations cover Docusaurus, MkDocs, Sphinx and GitHub; delivery surfaces include the docs site itself, Slack, Microsoft Teams, Discord and a docs MCP server, with 20-plus integrations in total. A separate internal-assistant mode answers from approved internal sources only, and a RAG API exposes retrieval and chat for teams building their own thing. The vendor reports over 100,000 technical questions answered at 98.7% rated helpful, and is deliberately explicit that it is not a lead-generation chatbot.

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Key Features

Indexes OpenAPI specs, code blocks, config examples and error messages
Source-linked answers back to the originating doc page
Unanswered-question log that becomes a documentation backlog
Docs MCP server plus Slack, Teams and Discord delivery
Docusaurus, MkDocs, Sphinx and GitHub source integrations
Internal assistant mode restricted to approved internal sources
RAG retrieval and chat API

Biel.ai Pros & Cons

Pros

  • +Unlimited dashboard seats on every tier, including the $50 entry plan
  • +The unanswered-question log turns support demand into a concrete writing queue
  • +Free for qualified open-source projects

⚠️ Cons

  • $50 per month minimum with no free tier for small personal docs sites
  • 500 indexed pages on Starter is tight for a mature API reference
  • MCP access requires the $150 Professional tier

Tags

documentationdocs-as-coderagdocusaurusmcpdeveloper-tools
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