Botoi Readability API

What Botoi Readability API is

Botoi Readability API analyzes English text and returns Flesch-Kincaid Grade, Flesch Reading Ease, Gunning Fog, and underlying counts. It accepts a required text string at POST /v1/text/readability and returns JSON. Flesch Reading Ease ranges from 0 to 100, with higher scores representing easier reading; Gunning Fog estimates years of formal education needed to understand the text. Its formulas and syllable heuristics are calibrated for English, so grade mapping is not meaningful for other languages. Botoi recommends sending at least 100 words because short passages can produce unstable scores. Suggested uses include applying plain-language standards, reviewing legal or medical drafts, refining blog posts for SEO, and comparing writing across authors. The product page provides cURL, JavaScript, TypeScript, Python, and Go examples. The Free plan costs nothing and lists 1,000 requests per day and 10 per minute; the endpoint page separately states a free-tier limit of 5 requests per minute without a credit card. Requests beyond a per-minute or daily cap receive HTTP 429, and daily limits reset at midnight UTC.