Octri vs Fern

Octri generates TypeScript, Python, Go, Java, Kotlin, Ruby, PHP, Rust, Swift and Dart. The Free plan includes one of them, and you choose which, so a team whose users write Go, Java or Kotlin can ship that client first. Starter includes 2, Growth 4, and Business all ten at $249 a month. A language past your bundle is $50 a month on Starter and Growth.

Publishing is part of every plan too. Octri releases to npm, PyPI, Maven Central, RubyGems, crates.io and pub.dev, and tags Go, PHP and Swift releases in git. Fern’s free plan publishes to npm and PyPI, and lists Maven, RubyGems and Packagist on Enterprise.

Streaming over server-sent events, retries with backoff, pagination, idempotency, multipart uploads and OAuth come with every Octri client in every language. Fern lists server-sent events, generated tests and custom code on Enterprise.

In SDK Studio you set client shape, method names and file layout for the whole project, for one language or for a single endpoint. Each change redraws the generated code beside it, so a renamed method can be checked in TypeScript, Python and Go before anything is published.

The people who review an SDK’s surface can do it without opening a YAML file, and the settings you choose for your public SDK double as the list of endpoints an AI agent may call through the MCP server.

Fern renders your spec and offers an AI agent that writes when you ask it to. Octri writes the reference for you on import: every endpoint gets a description, every request and response field is explained, and each error is documented by status code with its cause and fix. Edits are stored per page, so when the spec changes only the endpoints that moved are rewritten.

Every spec change becomes a dated changelog entry listing endpoints added, removed and changed, with breaking changes flagged, where Fern’s changelog is a set of entries you write. A quality score names the weakest endpoints on every plan, and a fix made inside the docs is committed back to your repository.

Fern’s docs MCP server exposes one tool, which answers questions about your documentation. Octri’s has seven for reading the docs (search, one endpoint in full, the endpoint list, guides, the changelog, your SDKs and the call in your own SDK) and one callable tool per endpoint, which makes the real request.

Endpoints you excluded from your SDK get no tool. The server runs locally over stdio with credentials kept on the developer’s machine, or as a shared SSE server for a team, and the tool list exports in MCP, OpenAI and Anthropic formats.

Custom components (built visually or in MDX, with props) and custom CSS with head and body code arrive on Growth at $79 a month, and white-label docs on Business. Before that, every plan gets a choice of page layouts, your accent colour, separate light and dark code themes, text size per region, tabs in the top bar, badges and icons in the sidebar, call-to-action buttons and social links for 21 platforms.

Every Octri SDK carries an error reporter. It ships switched off, and the developer who installs your SDK turns it on with one option. From then on a failure in their application reaches your project with the SDK version, the language, the method and the status, grouped into issues and tagged to the release that introduced it. Credentials and personal identifiers are redacted inside the SDK before anything is sent.

Your API is watched too. Uptime checks are generated from the endpoints in your spec, an incident publishes to a status page on your own domain and to a banner across your docs, and backend packages add logs, traces and latency targets per route. Fern does not list any of these.