Sillytavern
LLM Frontend for Power Users.
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What is Sillytavern?
SillyTavern is a locally installed user interface that allows you to interact with text generation LLMs, image generation engines, and TTS voice models. It serves as an LLM frontend for power users, providing a single unified interface for many LLM APIs including KoboldAI/CPP, Horde, NovelAI, Ooba, Tabby, OpenAI, OpenRouter, Claude, Mistral and more. The software is built around the concept of
Sillytavern pricing
Pricing model: Freemium
SillyTavern is completely free ($0) as an open-source project under the AGPL-3.0 License with no paywalls or feature gating. The software itself has no hidden fees and developers do not accept monetary donations for the project. Full feature set includes all backend connections supported, unlimited characters and chats, and all extensions available. Real costs come from electricity bills and potentially GPU hardware purchases (RTX 3060 recommended for 7B models). Users connecting to paid API backends like OpenAI, Claude, or other cloud services must pay those providers separately for API usage. AI Horde offers free out-of-the-box chatting as a community-driven option.
Sillytavern pros
- Completely free and open-source with no paywalls or feature gating
- Unlimited messages with no caps or rate limits
- Zero filters or censorship for unfiltered content
- Supports virtually every major AI backend from one interface
- Fully customizable interface with themes and custom CSS
- Rich character card system for immersive roleplay
- World Info lorebooks for persistent world-building
- Group chat with multiple AI characters simultaneously
- Built-in RAG support for document reference in chats
- Extensive extensions ecosystem for TTS and image generation
- Advanced prompt engineering with granular controls
- Active passionate community with frequent updates
- Mobile-friendly layout works on multiple devices
- Built-in auto-summary of chat history
- Auto-translate for UI and chat content
- Emotion sprites for character emotional expressions
- Web search capabilities for real-world context
- Multiple branch options for stable or cutting-edge features
- No account signup or login required
- Local deployment ensures complete privacy
Sillytavern cons
- Setup takes significant tinkering and technical knowledge
- No built-in AI models - requires separate backend
- GPU-hungry for running large local models
- Steep learning curve for prompt engineering
- Hardware requirements can be a barrier for some users
- 30-60 minute initial setup time expected
- CUDA errors and technical stumbles common for beginners
- Not suitable for casual users wanting instant access
- Mobile experience limited compared to desktop
- Power-user territory not beginner-friendly
- Requires NodeJS 20+ installation separately
- Staging branch may break at any time
- Electricity costs for local inference
- GPU purchase needed for smooth local runs
- Cloud alternatives offer easier instant access
- Documentation can be overwhelming for newcomers
- Requires API keys for cloud backend options
- Local models may produce lower quality than frontier APIs
Frequently asked questions about Sillytavern
What is SillyTavern?
SillyTavern is a locally installed user interface that allows you to interact with text generation LLMs, image generation engines, and TTS voice models. It is not a standalone AI but a frontend app that connects to various AI backends like KoboldAI, Oobabooga, OpenAI, Claude, and many others.
Is SillyTavern free to use?
Yes, SillyTavern is completely free and open-source under the AGPL-3.0 License with zero dollars for the app itself. There are no paywalls, feature gating, or hidden fees. The only costs are electricity for running it and potentially GPU hardware, or API fees if you use paid cloud backends.
What AI backends does SillyTavern support?
SillyTavern supports KoboldAI/CPP, Horde, NovelAI, Ooba, Tabby, OpenAI, OpenRouter, Claude, Mistral, and many more through OpenAI-compatible APIs. You can use local models via KoboldAI or Ollama, or connect to cloud services.
Do I need to create an account?
No, SillyTavern is a locally deployed chat program so there's no need to sign up or log in. Just install and open the program to use it.
What are the hardware requirements?
Hardware requirements are minimal - it will run on anything that can run NodeJS 20 or higher. For local LLM inference, a 3000-series NVIDIA graphics card with at least 6GB VRAM is recommended.
What are character cards?
Character cards are collections of prompts that set the behavior of the LLM and are required for persistent conversations. They function like ChatGPT's GPTs or Poe's bots, and can be anything from fictional characters to task-specific assistants.
Can I use SillyTavern for NSFW content?
Yes, SillyTavern has zero filters or censorship, allowing unfiltered NSFW roleplay. No corporate nanny blocks content, and you can feed it any prompt.
How long does setup take?
Expect 30-60 minutes the first time. It's easier in 2026 with better docs and one-click installers. Once set up, it's fire-and-forget with smooth updates.
What extensions are available?
Extensions include character emotional expressions (sprites), auto-summary of chat history, automatic UI and chat translation, Stable Diffusion/FLUX/DALL-E image generation, text-to-speech for AI responses, and web search capabilities.