classifier.dev

classifier.dev is a hosted classification API for developers and AI agents that need to sort text into their own labels without training a custom classifier. It accepts text and candidate labels, then returns a selected label and confidence score. Requests can contain up to 1,000 texts.

The service supports multiple classification dimensions, multi-label results, and review of uncertain answers. It is available through HTTP, a CLI, and an MCP server. It also accepts images with questions for structured answers, and can scrape a public URL through Context.dev before classifying its content.

Common uses include filtering search results, categorizing support tickets, and routing workflow steps by label. Free use does not require an account or API key and is subject to usage limits. Funded workspaces support paid usage and URL scraping.