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Prompto
Browser-based multi-LLM interface for developers
Table of Contents
Prompto - 2026 Pricing, Features, Reviews & Alternatives
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Last updated: September 2026
Prompto overview
What is Prompto?
Prompto is an open-source, web-based application that provides a lightweight interface for interacting with large language models (LLMs) directly from the browser. Built with Angular and powered by LangChain.js for in-browser LLM communication, it requires no server-side component or backend infrastructure. Preferences are stored locally, making it functional in offline environments. Source code is publicly available on GitHub for self-hosting and community contribution.
The application supports multiple LLM providers, including Ollama, OpenAI, Anthropic, and Mistral, with the ability to switch between them directly from the browser interface. Three distinct interaction modes are available: a notebook mode for single prompt execution, a chat UI for maintaining conversation history, and a template manager for saving and reusing frequent prompt structures. This flexibility allows users to adapt the tool to a range of workflows, from rapid prompt testing to structured, multi-turn conversations.
Prompto targets developers, AI enthusiasts, and open-source contributors who require a capable, dependency-light tool for multi-LLM interaction and comparison. Its architecture eliminates the overhead of backend setup, making it accessible for local experimentation, model comparison, and prompt engineering tasks without infrastructure investment.
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Prompto pricing
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Prompto FAQs
Prompto has the following typical customers:
Freelancers
Q. What level of support does Prompto offer?
Prompto offers the following support options:
Email/Help Desk