I Built a Readability Score API on Cloudflare Workers (Free Tier)

Building text analysis tools is surprisingly complex. Readability scoring alone involves multiple formulas — Flesch-Kincaid, Coleman-Liau, SMOG, ARI — each with different use cases. I built a Readability Score API on Cloudflare Workers that handles all of them in a single request. Here's how and why. The Problem Most readability tools are web-based. You paste text, click a button, get a score. That doesn't work when you need to: Analyze 1,000 blog posts programmatically Add readability checks to a CMS pipeline Build a writing assistant that scores in real-time You need an API. What It Does Send any text, get back a comprehensive readability analysis: { "text" : "Your text here..." } Response: { "flesch_reading_ease" : 65.2 , "flesch_kincaid_grade" : 8.1 , "coleman_liau_index" : 9.3 , "smog_index" : 7.8 , "ari" : 8.5 , "word_count" : 342 , "sentence_count" : 18 , "avg_words_per_sentence" : 19.0 , "reading_time_minutes" : 1.4 , "difficulty" : "Standard" } One API call. Six readability me