ChainForge, a visual tool for prompt engineering and LLM evaluation
Hi HN! We’re been working hard on this low-code tool for rapid prompt discovery, robustness testing and LLM evaluation. We’ve just released documentation to help new users learn how to use it and what it can already do. Let us know what you think! :)
ChainForge, a visual tool for prompt engineering and LLM evaluation launched on August 7, 2023 with 177 votes, #241 of 4,347 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 3 years on.
In plain words
ChainForge is a visual, low-code tool designed for prompt engineering and LLM evaluation. It enables users to rapidly discover effective prompts, test their robustness, and evaluate language model performance across different scenarios. The tool is intended for developers and researchers working with large language models who need to systematically improve and validate their prompts before deployment.
written from the facts on this page · September 2026
From the sources
ChainForge is an open-source visual programming environment for prompt engineering, LLM evaluation and experimentation. With ChainForge, you can evaluate the robustness of prompts and text generation models with little to no coding required. Features include: ChainForge is in active development and is provided as an open beta test . Open localhost:8000 in a Chrome, Firefox, Edge or Brave browser. For more details on installation, such as setting API keys as environment variables, see Getting Started . With Share, you can send your LLM experiments to others as links. Simply click Share to generate a unique weblink for your LLM experiment and copy it to your clipboard. For instance, here's an…from chainforge.ai
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