Tools
Small, free, and useful. No sign-up, nothing sent to a server — everything below runs in your browser.
VRAM calculator
Will this model fit on your GPU? Weights, KV cache, and context length, for any quantisation.
Local modelsToken estimator
Roughly how many tokens is this text, how much of a context window does it use, and what would it cost to embed.
Context & costMCP endpoint checker
Point it at an MCP server and it walks the OAuth discovery chain, then tells you which step failed.
MCP & OAuthWhy these exist
Varven runs a language model on your own computer and connects to assistants over the Model Context Protocol. Every tool here came out of a problem we hit building it, so they answer questions we had to answer anyway.
They are free, they need no account, and they run entirely in your browser — nothing you type is transmitted anywhere.