Detect language in millisecondsmillisecondsmillisecondsmillisecondsmillisecondsmillisecondsmilliseconds. The edge-native API

Francis brings franc-all to Cloudflare Workers. Ship language detection in milliseconds with API keys, usage tracking, and a modern console.

Multilingual text · 6 sentences · 6 languages

Click any sentence to switch its language

Built for developers.
Deployed on the edge.

Every feature is designed to make language detection fast, private, and painless to integrate.

Key management

Generate, revoke, and rotate API keys in one place. Built for multi-project usage.

Usage controls

Daily limits, usage summaries, and pricing-ready tables for future billing integrations.

Workers performance

HTTP-first endpoints optimized for Worker-to-Worker calls and edge latency.

API quickstart

One endpoint, one header, any language.

Terminalbash

$ curl -X POST 'https://francis.verbatims.cc/api/v1/detect' \
  -H 'x-api-key: fcs_****' \
  -d '{"text": "Hello world"}'

{ "language": "eng", "confidence": 0.97, "alternatives": ["spa", "fra"] }

400+ languages ISO 639-3 Edge native API key auth

Start today for free

No credit card required

Get started

400+Languages supported

<50ms

Average response time

Data retention

Start detecting language
in milliseconds.

Get a free API key and integrate language detection into your app in minutes. No credit card required.

Get Started