Compare
FieldFlow vs Smithery
Short answer: Pick FieldFlow if you want selective field fetching for LLM agents; pick Smithery if you want managed MCP server registry. FieldFlow is free; Smithery has a free plan, paid from $10/month.
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
- Starting price
- FieldFlow:—
- Smithery:$10/month (Pay as you Go)
- Free plan or trial
- FieldFlow:—
- Smithery:Free plan (Hobby)
- 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
What is the difference between FieldFlow and Smithery?+
Smithery is a registry for MCP servers, while FieldFlow creates the MCP server itself.
Should I use FieldFlow or Smithery?+
Pick FieldFlow if you want selective field fetching for LLM agents or open-source code (guillaumegay13/fieldflow on GitHub, MIT license). Pick Smithery if you want managed MCP server registry or MCP server discovery.
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.