Prompto

Comparing how two language models answer the same prompt, then saving the better version for later, takes a few clicks in Prompto.

Prompto is a free, open-source AI chatbot interface and prompt manager that runs in your browser and works with multiple large language models.

You connect models through LangChain.js, so several providers can sit in one spot, though you have to supply your own LLM provider connection before anything works.

The app has five modes: chat, notebook, templates, arena and discussion.

The arena suits side-by-side comparisons, while templates fit prompts you run again and again.

As a PWA, Prompto runs entirely in the browser, and your settings and data are stored locally on your device rather than on a server.

That helps privacy, but it relies on browser storage, which other people may reach on a shared computer.

JavaScript must be enabled too.

Developers and anyone who regularly tinkers with prompts will get the most out of this prompt generator and chat app.