AgentIndex icon
AgentIndex
fitter logo
fitter
★ 133
vs
rllm logo
rllm
★ 5.9k

fitter vs rllm

fitter: Fitter is a declarative tool that transforms any website or API into structured JSON, eliminating the need for brittle scraping scripts. It's designed for AI agents, allowing Large Language Models to author, validate, and execute data extraction pipelines locally, on demand.; rllm: rLLM is an open-source framework designed for post-training language agents using reinforcement learning. It allows users to easily build, train, and deploy custom agents and environments for real-world workloads.

01

TL;DR

fitter logo
fitterLLM Infra · ★ 133

Scrape data from websites without APIs and enrich it with data from external APIs (e.g., GitHub trending repos scraped from HTML, then enriched via GitHub REST API).

Read fitter full review →
rllm logo
rllmLLM Infra · ★ 5.9k

Training powerful coding models for tasks like code generation and bug fixing.

Read rllm full review →
02

Side-by-Side Comparison

Field
fitter logofitter
rllm logorllm
Category
LLM Infra
LLM Infra
Stars
★ 133
★ 5.9k
License
MIT
Apache-2.0
Install Command
go build -o fitter_mcp ./cmd/mcp && claude mcp add fitter -s user -- "$(pwd)/fitter_mcp"
uv pip install "rllm[verl] @ git+https://github.com/rllm-org/rllm.git"
Updated
1mo ago
1w ago
Open Source
Yes
Yes
Website
↗ Visit
↗ Visit
GitHub
↗ GitHub
↗ GitHub
Tags
Web Scraping, Data Extraction, AI Agents
Reinforcement Learning, Language Agents, LLM
03

Features

fitter logofitter
01Declarative & Auditable Configuration: AI agents produce readable, savable, and re-runnable configurations instead of throwaway code.
02Local-first Data Fetching: All data fetching occurs on the user's machine, eliminating reliance on third-party scraping APIs or per-request billing.
03Batteries Included: Provides a comprehensive set of tools including HTTP client, headless browser (Playwright/Chromium/Docker), various parsers (JSON, HTML, XML, XPath), pagination, caching, and rate-limiting.
04Multiple Usage Modes: Can be used as an MCP server for AI clients, an AI-powered CLI agent, a local CLI, an embeddable Go library, or a long-running service.
05LLM Integration via MCP: Exposes a Model Context Protocol (MCP) server, enabling Claude Code, Claude Desktop, and other MCP clients to author and run scraping pipelines.
rllm logorllm
01Open-source framework for reinforcement learning-based post-training of language agents.
02Supports building, training, and deploying custom agents and environments.
03Offers multiple training backends including 'verl' and 'tinker'.
04Enables LoRA and VLM training for advanced models.
05Includes AgentWorkflowEngine for training over arbitrary agentic programs.
04

Use Cases

fitter logofitter
↳Scrape data from websites without APIs and enrich it with data from external APIs (e.g., GitHub trending repos scraped from HTML, then enriched via GitHub REST API).
↳Extract structured information from dynamic web pages using headless browsers for JavaScript-rendered content.
↳Automate data collection for AI agents, allowing them to dynamically generate and execute data extraction configurations based on natural language requests.
↳Generate static data sequences or transform data fields based on calculated expressions.
↳Write extracted results to local files in various formats (e.g., CSV) for reporting or further processing.
rllm logorllm
↳Training powerful coding models for tasks like code generation and bug fixing.
↳Developing sophisticated software engineering agents for automated tasks.
↳Building and evaluating multi-agent systems using reinforcement learning techniques.
05

Best For

fitter logofitter
—
rllm logorllm
Trending
FAQ

FAQ

What is the difference between fitter and rllm?
Both fitter and rllm are in the LLM Infra category. fitter has 133 stars, while rllm has 5.9k stars.
Which is better, fitter or rllm?
The best choice depends on your use case. Choose fitter if Scrape data from websites without APIs and enrich it with data from external APIs (e.g., GitHub trending repos scraped from HTML, then enriched via GitHub REST API)., and rllm if Training powerful coding models for tasks like code generation and bug fixing..
Is fitter free or open source?
Yes, fitter is open source on GitHub (MIT).
Is rllm free or open source?
Yes, rllm is open source on GitHub (Apache-2.0).
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