Theneo
A tool that turns a raw OpenAPI spec into polished, interactive API documentation and a full developer portal — with an AI assistant that answers developer questions and flags breaking changes before they surprise anyone.
🔗 Visit Theneo
Description
Publishing API documentation usually means either hand-writing docs that go stale the moment the API changes, or wrestling with a generic Swagger UI that developers tolerate rather than enjoy. Theneo's pitch is to generate documentation that looks hand-crafted, keeps itself current, and can answer questions on its own.
Theneo is an AI-native platform for API documentation and developer portals supporting REST, GraphQL, gRPC, SOAP and Async APIs, with automatic breaking-change detection in changelogs, an "Ask AI" bot for developer queries, private authenticated customer portals with role-based access, multi-stage review workflows, and both WYSIWYG and Markdown editing. It's Y Combinator-backed with funding from Mercury Bank and Atlassian, has been building AI documentation generation since 2022 (predating ChatGPT's public launch), holds SOC 2 Type II / ISO 27001 / GDPR compliance, and serves 15,000+ teams from startups to Fortune 500s, with pricing from a genuinely free Starter tier up to $400-450/month Growth and custom Enterprise.
💬 Our review
The short version: Theneo's free tier (1 public project, 20 team members, 100 AI search results) is generous enough to actually run a small API's documentation on, which is rare in this category, and the breaking-change detection is a real, practical feature rather than a marketing checkbox.
Against Mintlify (the most-cited leader in API docs for 2026) or GitBook, Theneo leans harder into AI-native from day one — it's been doing AI-assisted doc generation since 2022 — and adds private, authenticated customer portals with RBAC, which matters if you're documenting APIs for enterprise or regulated customers rather than public open APIs. The jump from free to Business ($120-150/month) is steep if you need more than 2 private projects or 20 members, and Theneo is a smaller, YC-stage company compared to the more established Mintlify, so support depth and long-term stability are less proven. Worth it for a fintech or B2B platform that needs private, access-controlled API docs with AI assistance built in; a public open-source project with simple docs needs may be just as well served by Mintlify's more established ecosystem.
💰 Pricing
📊 Global score
🤖 AI-enriched data
Starter gratuit (1 projet public + 2 privés, 20 membres, 100 résultats IA). Business 120-150 $/mois (7 projets, 50 membres, IA illimitée). Growth 400-450 $/mois (20 hubs développeurs). Enterprise sur devis (self-hosting, SAML/OAuth).
Pros
Palier gratuit réellement utilisable (1 projet public, 20 membres)
Détection automatique des breaking changes dans les changelogs
Portails clients privés avec contrôle d'accès par rôle (RBAC)
IA de documentation développée depuis 2022, avant l'essor de ChatGPT
Cons
Saut de prix important entre Starter gratuit et Business (120-150 $/mois)
Entreprise plus jeune et moins établie que Mintlify ou GitBook
Pertinence surtout pour les cas avec besoin de contrôle d'accès, moins pour une doc publique simple
Nombre de projets limité même sur les paliers payants intermédiaires