Scalar
An open-source API documentation platform and REST client that turns an OpenAPI or AsyncAPI spec into interactive docs and multi-language SDKs, syncing automatically with your code via Git so docs never drift out of date.
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Description
API documentation almost always goes stale the moment someone forgets to update it after a code change — a familiar problem for any team that's had a developer file a bug against outdated docs. Scalar treats documentation like code: it stays in sync with your actual API spec through Git, the same discipline teams already use to keep source code consistent, instead of being a separate document someone has to remember to update.
Scalar is an open-source, OpenAPI/AsyncAPI-based platform combining interactive API documentation, a REST API client (positioned as a modern, more accessible alternative to Postman), multi-language SDK generation (TypeScript, Python, Go, PHP, Java, Ruby), and MCP server building. Git Sync keeps documentation automatically current as the underlying API evolves, removing the manual update step that causes most docs to go stale. Pricing is freemium: Free (hosted docs, built-in API client, 50 Agent credits), Pro at €72/month (custom domains, Git Sync, SDKs, MCP servers), and custom Enterprise pricing (full portals, SSO/SAML, dedicated support), with additional SDK languages at €100 each.
💬 Our review
The short version: if API docs going out of sync with the actual API is a recurring problem for your team, Scalar's Git-based sync plus a genuinely useful built-in REST client (a real alternative to keeping Postman around) makes the €72/month Pro tier easy to justify once you need more than the free tier's basics.
Scalar's open-source foundation is a real advantage over closed competitors like Postman or Stoplight — you can audit or self-host the core, and the free tier is generous enough (hosted docs, built-in client) for a small team or solo developer to fully evaluate before paying. The €100-per-additional-SDK-language fee is a detail worth budgeting for if you support many languages, since it adds up quickly beyond the base Pro plan. Compared to Fern or Stainless (SDK-generation specialists), Scalar's edge is combining docs, a REST client, and SDK generation in one tool rather than requiring separate products for each — a meaningful convenience if you don't already have a preferred point solution for each piece.
💰 Pricing
📊 Global score
🤖 AI-enriched data
Gratuit (docs hébergées, client API, 50 crédits Agent) ; Pro 72€/mois (domaines personnalisés, Git Sync, SDKs, MCP) ; Enterprise sur devis ; SDK additionnel 100€/langage.
Pros
Open-source, auditable et potentiellement self-hostable
Synchronisation Git automatique — la doc ne se désynchronise jamais du code
Combine documentation, client REST et génération de SDK dans un seul outil
Plan gratuit généreux pour évaluer avant de payer
Cons
Frais additionnel de 100€ par langage SDK supplémentaire
Enterprise sur devis, coût final incertain à grande échelle
Combine plusieurs fonctions — moins spécialisé qu'un outil dédié SDK (Fern, Stainless)