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FieldFlow vs Smithery
Smithery is a registry for MCP servers, while FieldFlow creates the MCP server itself.
FieldFlowTurn your REST API into an optimized MCP Server
SmitheryRegistry for finding and hosting MCP serversWhich to pick
Pick FieldFlow if you want…
- Selective field fetching for LLM agents
- Open-source code (guillaumegay13/fieldflow on GitHub, MIT license)
Pick Smithery if you want…
- Managed MCP server registry
- MCP server discovery
Side by side
- What it is
- FieldFlow:FieldFlow converts any OpenAPI-described REST API into a filtered MCP server with FastAPI routes.
- Smithery:Smithery is a registry and hosting platform for MCP servers that lets AI agents connect to tools with built-in auth, credentials and session management.
- Best for
- FieldFlow:Selective field fetching for LLM agents
- Smithery:Managed MCP server registry
- Who it’s for
- FieldFlow:Developers building LLM agents or apps that need field-level API responses.
- Smithery:Developers building AI agents that need easy access to MCP tools and services
- Pricing
- FieldFlow:Free
- Smithery:Freemium
- Plans
- FieldFlow:—
- Smithery:Hobby Free · Pay as you Go $10/mo per month
- Open source
- FieldFlow:Yes, 111 GitHub stars
- Smithery:—
- Works with
- FieldFlow:FastAPI, httpx, Pydantic, OpenAPI 3.x, Model Context Protocol, Claude Desktop
- Smithery:—
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.
Smithery features
- MCP Server Registry. Find and list MCP servers for agents to discover and use.
- Hosted MCP Servers. Host your own MCP server with built-in management.
- Managed OAuth. Provides OAuth handling without requiring developers to manage keys.
- Persistent Connections. Keeps agent sessions alive for continuous interactions.
- RPC Quotas. Offers tiered RPC limits (50K free, 100K paid) for API calls.
- Namespace Support. Supports multiple namespaces for organizing tools.
FieldFlow vs Smithery FAQ
Is FieldFlow or Smithery free?+
FieldFlow is listed as free on DevHunt. Smithery has a free plan (Hobby); paid plans start at $10/month (Pay as you Go).
Is FieldFlow or Smithery open source?+
FieldFlow is open source (guillaumegay13/fieldflow on GitHub, MIT license). DevHunt has no public source repository on record for Smithery.
On DevHunt
Based on each tool's website and DevHunt data. Details may change; check the official sites.