Compare
FieldFlow vs Postman
Postman is a full API design, testing and documentation platform, not a selective field proxy.
FieldFlowTurn your REST API into an optimized MCP Server
PostmanAPI platform for designing, testing and documenting APIsWhich to pick
Pick FieldFlow if you want…
- Selective field fetching for LLM agents
- Open-source code (guillaumegay13/fieldflow on GitHub, MIT license)
- Integrations with FastAPI, httpx or Pydantic (on FieldFlow's list, not Postman's)
Pick Postman if you want…
- Full-stack API lifecycle platform
- API design & testing
- Integrations with VS Code, Git or AWS (on Postman's list, not FieldFlow's)
Side by side
- What it is
- FieldFlow:FieldFlow converts any OpenAPI-described REST API into a filtered MCP server with FastAPI routes.
- Postman:Postman is an API platform for designing, testing, documenting, and monitoring APIs.
- Best for
- FieldFlow:Selective field fetching for LLM agents
- Postman:Full-stack API lifecycle platform
- Who it’s for
- FieldFlow:Developers building LLM agents or apps that need field-level API responses.
- Postman:Developers and teams building, testing, and managing APIs.
- Pricing
- FieldFlow:Free
- Postman:Freemium
- Plans
- FieldFlow:—
- Postman:Free $0 · Solo $9 per month (billed annually) · Team $19 per user/month (billed annuall
- Open source
- FieldFlow:Yes, 111 GitHub stars
- Postman:—
- Works with
- FieldFlow:FastAPI, httpx, Pydantic, OpenAPI 3.x, Model Context Protocol, Claude Desktop
- Postman:VS Code, Git, AWS, Postman CLI, Postman API
FieldFlow features
- OpenAPI native. Point FieldFlow at an OpenAPI 3.x spec and it auto-discovers endpoints and schemas.
- Typed Pydantic models. Generates request/response models with full validation, aliases and nested refs.
- Selective responses. Each route accepts a fields list so callers receive only the data they request.
- FastAPI gateway. Proxies calls via httpx and serves filtered results through FastAPI routes.
- Spec-first fidelity. Handles recursive schema resolution to stay aligned with the upstream API.
- Optional MCP layer. Exposes the same filtered endpoints to Model Context Protocol clients like Claude Desktop.
Postman features
- API design & discovery. Create, version, and explore APIs with the Context Graph and API discovery tools.
- Automated testing. Generate collections, run automated tests, and perform performance testing with unlimited runners.
- Mock servers. Spin up mock servers to simulate APIs before they exist.
- API monitoring. Monitor live endpoints for uptime, drift, and performance metrics.
- CI/CD integration. Run collection and governance checks on every commit via Postman CLI and integrations.
FieldFlow vs Postman FAQ
Is FieldFlow or Postman free?+
FieldFlow is listed as free on DevHunt. Postman has a free plan; paid plans start at $9/month (Solo).
Is FieldFlow or Postman open source?+
FieldFlow is open source (guillaumegay13/fieldflow on GitHub, MIT license). DevHunt has no public source repository on record for Postman.
Do FieldFlow and Postman integrate with the same tools?+
Their integration lists don't overlap: FieldFlow lists FastAPI, httpx, Pydantic, OpenAPI 3.x and 2 more; Postman lists VS Code, Git, AWS, Postman CLI and 1 more.
On DevHunt
Based on each tool's website and DevHunt data. Details may change; check the official sites.