What is Prompto?

Prompto is an open‑source Angular application that offers a browser‑based interface for interacting with Language Models through LangChain.js. It lets users switch between multiple LLMs, adjust the temperature to control creativity, and work in several interaction modes—including chat, notebook, template, arena, and discussion.

Prompto runs as a Progressive Web App, so all settings, chat histories, templates, and configurations are stored locally in the browser. The serverless design eliminates the need for a backend, and the local storage approach allows easy data access while maintaining user privacy.

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Prompto's key features

Supports multiple LLMs
Temperature control for creativity
Chat, notebook, templates modes
PWA runs entirely in browser
Serverless, direct LangChain.js communication
Local storage for settings, history
Open-source MIT license

Prompto use cases

Generate personalized study notes by interacting with multiple LLMs through Prompo's notebook mode, adjusting temperature for deeper explanations while keeping all data locally stored for privacy
Build a collaborative brainstorming session using Prompo's arena mode, where team members can test various LLM prompts side-by-side, and results are saved locally without exposing data to external services
Create an on-the-fly coding assistant in Prompo's chat mode, allowing developers to tweak prompt creativity on the fly, and automatically store all chat histories offline for reference