ChainForge

At a glance

• Editor score
  7.9 / 10
• Pricing
  Open source
• Best for
  Visual comparison of prompts and models
• Paid from
  Free
• Model support
  Custom
• Facts checked
  21 Sep 2026

• Where it wins

  • Queries multiple LLMs simultaneously across supported providers
  • Combines prompt templates, permutations, chaining, and evaluators
  • Visualizes evaluation results and supports response inspection and Excel export

• Where it doesn't

  • Optimization is manual rather than automated
  • No API access for production workflows
  • Local installation requires Python

Our verdict on ChainForge

ChainForge is an open-source visual programming environment for prompt engineering, LLM evaluation, and experimentation. It is aimed at developers, researchers, and other users who need to compare prompt behavior across language models and settings. The browser-based experience supports simultaneous queries, while local installation provides a self-hosted option. Its visual workspace is focused on inspecting model responses rather than providing a production API layer.

The main strength is breadth within prompt experimentation. Users can create templates with replaceable variables, generate permutations, and chain templates for structured comparisons. ChainForge supports OpenAI, Anthropic, Google Gemini, Google PaLM2, HuggingFace, Microsoft Azure OpenAI, Amazon Bedrock, and Ollama. Custom model providers can also be added through Python. For analysis, the product includes code-based and LLM-based evaluations, simple and multi-criteria evaluators, visual charts, response inspection, and Excel export. This makes it a strong fit for visual model comparisons and research-oriented prompt analysis.

ChainForge is less suited to teams seeking automated prompt optimization or an API-first workflow. Its optimization mode is manual, and the published product specifications do not include API access. The available deployment choices are a browser-based experience and local installation with Python, with the documentation describing the product as an open beta. Choose ChainForge when comparing prompts, models, parameters, and evaluation results is the priority. Consider an alternative when production integration, automated optimization, or a more operational deployment workflow matters more than visual experimentation.

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ChainForge pricing

ChainForge fact sheet

ChainForge integrations

ChainForge lists 8 integrations on its own site.

• OpenAI
• Anthropic
• Google Gemini
• Google PaLM2
• HuggingFace
• Microsoft Azure OpenAI
• Amazon Bedrock
• Ollama

Alternatives to ChainForge

• AgentaA full prompt operations workspace with testing, evaluations, tracing, and self-hosting.9.4
• MLflow Prompt OptimizationA developer-focused toolkit for evaluating, rewriting, versioning, and optimizing prompts.9.3
• ProofHoundA focused prompt operations platform for testing, releasing, and monitoring LLM classifiers.9.2

See all ChainForge alternatives →

Featured on iTechGuides

ChainForge is listed in our AI Prompt Generators directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update