Spark
Self-hosted AI chat powered by Open WebUI
Spark is a self-hosted Open WebUI instance providing a polished chat interface for interacting with locally-run large language models. Because everything runs on-premises, conversations stay private — no data is sent to third-party cloud APIs. The UI supports multiple model backends, conversation threads, and a familiar chat experience. Access requires an account login to keep your conversations secure.
Private by Default
All inference runs locally. Conversations never leave your self-hosted infrastructure — zero data leakage to external APIs.
Multiple Models
Switch between available local LLMs from a single interface without changing tools or reconfiguring.
Chat History
Conversations are saved and searchable, so you can pick up where you left off or revisit past insights.
System Prompts & Tools
Customize model behavior with system prompts, and extend functionality with built-in tool support.
Knowledge Base
Upload documents and chat with them — Open WebUI supports RAG pipelines for private document analysis.
Polished UI
A beautiful, responsive chat interface with Markdown rendering, code highlighting, and streaming responses.