ChainForge vs Promptotype

ChainForge is an open-source visual programming environment for prompt engineering, LLM evaluation, and experimentation. It can query multiple language models at once and compare results across prompts, models, and model settings. Responses can be scored with code-based or LLM-based evaluators, then plotted for review. Chat Turn nodes support continuing multiple conversations, templating chat messages, and handing a conversation from one model to another. The tool imports JSONL, XLSX, and CSV files and exports inspected response data as XLSX. Listed providers include OpenAI, Anthropic, Google Gemini and PaLM, Hugging Face, Azure OpenAI, Amazon Bedrock, and Ollama. A local installation can add custom providers written as Python completion functions. The web version has a limited feature set; local use supports API keys from environment variables, Python evaluation code, and locally hosted Alpaca or Llama models via Dalai. Web users must set API keys each time they load the app, and the documentation says keys are not stored. ChainForge is available on the web or self-hosted, is free and open source, and is described as an open beta in active development.

Promptotype is a web-based platform for developing and evaluating structured tasks for language models. Its playground lets users build prompt templates, configure models, and work with function calling. Test queries can include expected JSON schemas or values; a model query can fill in an expected result. Users can run prompts against collections, from smaller development sets to larger checks for production readiness. The platform also provides run and test history, scheduled automated tests with email summaries, and automatic fine-tuned model creation from query collections. A JSON Schema Editor supports schemas compatible with the OpenAI API’s json_schema response_format. The free plan is free. Basic costs $6 a month and adds libraries for templates, configurations, and queries, plus collection testing. Professional costs $10 a month and includes 60 days of history, fine-tuning, and one weekly scheduled run. Team features are contact-based. The maker is Baionic, LLC, which lists a New York, New York mailing address.