LLMStack

LLMStack is an open source platform for building AI agents, workflows and applications on top of an organization's own data. Users chain models from OpenAI, Cohere, Stability AI, Hugging Face and other providers into multistep apps, attach data from PDFs, URLs, Google Drive and Notion for retrieval augmented generation, and publish the result as a chatbot, an API or an embedded widget without writing application code. It suits developers and technical teams that want a self hosted alternative to closed app builders. Installation is a pip package that runs locally or on private infrastructure, apps can be shared publicly or restricted to named users with permission controls, and finished apps connect to Slack, Discord and other channels. The GitHub repository remains under active development. LLMStack itself is free to run on your own hardware. The same team offers a hosted version called Promptly at trypromptly.com, priced at Free for $0 per month with 10 apps, 1 private app and 1,000 credits, Pro at $99.99 per month or $999 per year with 100 apps, 10 private apps and 13,000 credits, and Enterprise at custom pricing with unlimited apps, dedicated support, SOC 2 Type II certification and an optional self hosted vector database.