Open WebUIvsSemantic Kernel

Full side-by-side comparison — features, pricing, platforms, and which one wins in 2026.

Open WebUI

Chat Interfaces

Beautiful self-hosted ChatGPT-like interface for any LLM

Full review →Website ↗

Semantic Kernel

Developer Tools

Microsoft's AI orchestration SDK for building agents with .NET, Python, and Java

Full review →Website ↗
FeatureOpen WebUISemantic Kernel
CategoryChat InterfacesDeveloper Tools
PricingFree (open-source)Free (open-source)
GitHub Stars
✓ More stars
65k
23k
PlatformsmacOS, Linux, Windows, DockerLinux, macOS, Windows
Key Features
  • ✓ Ollama integration
  • ✓ Multi-model
  • ✓ RAG
  • ✓ Web search
  • ✓ Voice input/output
  • ✓ Plugins
  • ✓ User management
  • ✓ Plugin system
  • ✓ Memory
  • ✓ Planner
  • ✓ Multi-language
  • ✓ Azure integration
Pros
  • + Feature-rich ChatGPT alternative
  • + Supports Ollama + OpenAI APIs
  • + Document upload and RAG
  • + Multi-user with auth
  • + Very active development
  • + Enterprise-ready with Microsoft backing
  • + Multi-language (C#, Python, Java)
  • + Deep Azure OpenAI integration
  • + Plugin architecture for extensibility
Cons
  • − Requires Docker for easy setup
  • − Can be slow with large documents
  • − Plugin ecosystem still growing
  • − Resource intensive
  • − Heavy enterprise focus
  • − Verbose API compared to alternatives
Tags
open-sourcechatuiollamaself-hosted
microsoftsdkenterprisedotnet

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