SillyTavern review

SillyTavern is the answer for Character.AI users who want no queue and no platform rules beyond their own. It is not a hosted service but a locally installed interface that talks to text, image and voice models you connect, from OpenAI-compatible APIs to KoboldAI, Tabby or the community AI Horde. The project says it will always be free and open source, and it does not accept donations for the project itself. Features are aimed at serious roleplay: character cards, World Info for lore that enters the prompt only when relevant, group chats with several bots, personas, built-in RAG, an auto-summary extension, expression sprites and text-to-speech. Memory length is whatever your chosen model supports, stretched by summaries and World Info. The cost is setup time. You need NodeJS 20 or higher, a backend, and for local models a graphics card with at least 6GB of VRAM. The docs themselves call the learning curve steep.

Who it is for

Hobbyists who want full control over prompts, models and filters and do not mind a learning curve.

Price

Free and open source (AGPL-3.0); you pay only for any model API you connect.

US price check pending. See the vendor pricing page.

Key features

• Character cards that work like Poe bots or custom GPTs
• World Info for lore that enters the prompt when needed
• Group chats where several characters talk to you and each other
• Built-in RAG for documents and an auto-summary extension
• Connections to OpenAI-compatible APIs, KoboldAI, Tabby, AI Horde and more

Strengths and weaknesses

• Strength: Free and open source under AGPL-3.0, with no paid tier
• Strength: You choose the model, so memory and filters depend on your backend
• Strength: Over 300 contributors and monthly stable releases
• Weakness: You must install it and run it on NodeJS 20 or higher
• Weakness: It is only an interface, so you still need a model backend
• Weakness: Local models need a strong graphics card, the docs suggest 6GB of VRAM or more

Key facts

• License: AGPL-3.0, free and open source
• Contributors: Over 300
• Requirements: NodeJS 20 or higher
• Instant chat option: AI Horde, with no setup

Where it ranks

SillyTavern is No. 4 in our Best Character.AI Alternatives verdict.