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Fern Alternatives
Similar projects and alternatives to fern
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Puter.js
Puter.js - The Backend for AI-Generated Apps. One-shot full-stack apps with your existing AI coding tool. Puter.js gives you Auth, Storage, DB, AI & more, with up to 90% fewer AI tokens than other backend platforms.
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openapi-generator
OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)
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lago
Open Source Metering and Usage Based Billing API ⭐️ Consumption tracking, Subscription management, Pricing iterations, Payment orchestration & Revenue analytics
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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langfuse
🪢 Open source AI engineering platform: LLM evals, observability, metrics, prompt management, playground, datasets. Integrates with OpenTelemetry, LangChain, OpenAI SDK, LiteLLM, and more. 🍊YC W23
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sig-moonwalk
The effort to explore the future of the OpenAPI Specification is known as "Moonwalk." It includes 4.x considerations but also strives to consider 3.x. There is no planned end date to 4.0, so we strongly recommend using the 3.x versions that exist today.
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datamodel-code-generator
Generate Pydantic v2 models, dataclasses, TypedDict, and msgspec.Struct from OpenAPI, JSON Schema, GraphQL, Avro, Protobuf, and raw JSON/YAML/CSV.
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openapi-typescript-codegen
NodeJS library that generates Typescript or Javascript clients based on the OpenAPI specification
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a better fern alternative or higher similarity.
fern discussion
fern reviews and mentions
Posts with mentions or reviews of fern.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2026-05-18.
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Anthropic Acquires Stainless
Stainless is way more than just the codegen. If you’re curious I did write some details when responding to another comment: https://news.ycombinator.com/item?id=48191376
But Fern is a (great) Stainless competitor that went the open source way, so that could have been an option: https://buildwithfern.com/
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Redefining our SDKs Developer Experience
After evaluating multiple SDK-as-a-service vendors, including Speakeasy, Fern and Liblab, we selected Speakeasy as our strategic partner. Speakeasy’s philosophy aligns with our mission to deliver an outstanding developer experience. Here’s why we’re excited about this partnership:
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7 SDK Generator Tools for APIs in 2025
Fern
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The Stainless SDK Generator
Lots of these have been popping up lately, they all seem really good.
https://buildwithfern.com/
- Fern: Toolkit to generate SDKs and Docs for your API
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Ask HN: Who is hiring? (December 2023)
Fern | https://buildwithfern.com | Founding Backend Engineer | $160k + equity | On-site NYC | Full-time
At Fern, we're creating the modern developer experience platform. We work with developer-focused companies to generate SDKs & API documentation. We're looking for a Founding Backend Engineer to help us scale with our users. You'll join a small team (3 of us) and will be a product owner who designs, builds, and ships weekly.
Learn more at https://www.buildwithfern.com/careers
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Ask HN: Who is hiring? (November 2023)
Fern (YC W23) | Founding Engineer | New York City | $130k-$160k + 0.5-1.0% equity | Full Time | Open Source | https://buildwithfern.com
REST APIs underpin the internet but are still painful to work with. They are often untyped, unstandardized, and out-of-sync across multiple sources of truth. With Fern, we aim to bring great developer experiences to REST APIs.
Our stack is Next.js + Vercel, Express (Node.js) + FastAPI (Python), Postgres DB + Prisma ORM, and AWS CDK. We're open source: https://www.github.com/fern-api/fern
We closed a Seed this year from top-tier US investors, including Y Combinator, Abhinav Asthana (Postman CEO), Arash Ferdowsi (Dropbox co-founder), and Ian McCrystal (Stripe's Head of Docs).
Learn more: https://www.buildwithfern.com/careers
- Fern: Beautiful SDKs and Docs for Your API
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Show HN: REST Alternative to GraphQL and tRPC
Thank you for your encouraging words and insights!
There are indeed popular DSLs and code to openapi solutions out there. Many of which are easy to plug in to the openapi-stack libraries btw!
I guess I personally always found it frustrating to try to control the generated OpenAPI output using additional tooling and ended up preferring yaml + a visualisation tool as the api design workflow. (e.g. swagger editor)
But something like https://buildwithfern.com, or using zod as substitute for json schema may indeed be worth a try as a step before emitting openapi.
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Ask HN: Who is hiring? (October 2023)
Fern (YC W23) | Founding Engineer | New York City | $125k-$175k + equity | Full Time | Open Source | https://buildwithfern.com
REST APIs underpin the internet but are still painful to work with. They are often untyped, unstandardized, and out-of-sync across multiple sources of truth. With Fern, we aim to bring great developer experiences to REST APIs.
Our stack is Next.js + Vercel, Express (Node.js) + FastAPI (Python), Postgres DB + Prisma ORM, and AWS CDK.
We closed a Seed this year from top-tier US investors, including Y Combinator, Abhinav Asthana (Postman CEO), Arash Ferdowsi (Dropbox co-founder), and Ian McCrystal (Stripe's Head of Docs).
Apply by emailing careers@buildwithfern.com
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A note from our sponsor - SaaSHub
www.saashub.com | 18 Aug 2026
Stats
Basic fern repo stats
33
3,757
10.0
4 days ago
fern-api/fern is an open source project licensed under Apache License 2.0 which is an OSI approved license.
The primary programming language of fern is TypeScript.
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