classifier.dev

classifier.

What it does

classifier.dev is a hosted zero-shot text classifier: send labels and text, get calibrated scores back over REST with no account on the free tier. The fast tier uses Jev; the smart tier escalates uncertain items to a reasoning model (public smart requests cap at 200 inputs per call). OpenAPI lives at classifier.dev/openapi.json; llms.txt at classifier.dev/llms.txt. Measured on classifier.dev/benchmark (400 items each, live 2026-09-18): fast tier AG News 87.5% and emotion 61.8%; smart tier AG News 90.0% and emotion 62.7%. Free per-IP limits count classifications, not HTTP requests: fast 3,000/min and 20,000/day; smart 200/min and 2,000/day. Pro is $20/month with Bearer classifier_pro_ keys (fast 30,000/min and 200,000/day; smart 2,000/min and 20,000/day). The site states fast model cost about $0.005 per thousand classifications and smart escalations about $0.70 per thousand on its own pricing and benchmark pages. Privacy policy: text is not stored or logged; it is sent to the model provider only to classify. A shipped workflow you can study before you bet your own traffic on the same gate style. Tags in the wild: applications, classification, moderation. Skim the repo for setup, then open the demo when you want proof before you merge anything.