Readability Score API

Readability Score API — Flesch / FK / SMOG / ARI / Gunning Fog + reading-level summary.

What you get

• POST /v1/readability/score — primary endpoint.
• X-API-Key authentication, per-key rate limits, audit log.
• OpenRouter-backed where AI is involved — no model keys to manage on your side.
• Interactive Swagger docs at api-readability.knowlez.com/docs.

Plans

• Starter — $9/mo · 10,000 checks included · $0.0002/check overage.
• Pro — $29/mo · 100,000 checks included · $0.0001/check overage.