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Here's the text: 'The mitochondria is the powerhouse of the cell, producing ATP through oxidative phosphorylation in a process regulated by complex enzyme cascades.'","exampleUseCases":[{"title":"Checking blog post accessibility","prompt":"I'm about to publish a blog post aimed at general consumers — can you run a readability check on this draft and tell me the Flesch reading ease score, the consensus grade level, and whether the writing is appropriate for a broad audience? Here's the text: 'Our new product helps you save money by automatically tracking your subscriptions and canceling ones you no longer use.'"},{"title":"Evaluating legal document complexity","prompt":"This legal disclaimer needs to be readable by the average person — can you analyze its readability scores including Flesch-Kincaid grade, Gunning Fog, and reading level, and give me any writing advice? Text: 'The indemnification obligations set forth herein shall survive the termination or expiration of this Agreement and shall be binding upon the parties and their respective successors and assigns.'"},{"title":"Estimating speech reading time","prompt":"I'm preparing a speech and need to know how many minutes it will take to deliver — can you run this text through a readability analysis and give me the speaking time, word count, and sentence count? Text: 'Friends, we gather today not to mourn what was lost, but to celebrate the resilience of our community and the promise of tomorrow.'"}],"resultDescription":"A JSON object containing word count, sentence count, syllable count, complex word count and percentage, Flesch reading ease score, Flesch-Kincaid grade, Gunning Fog index, SMOG index, Coleman-Liau index, ARI score, consensus grade level, a reading level label (e.g. '8th grade'), estimated reading time in minutes, speaking time in minutes, a data source note, optional caveats, and plain-English writing advice.","failureModes":["Text shorter than 20 or longer than 5000 characters returns a validation error","Non-English text may produce inaccurate or nonsensical scores since the algorithms are calibrated for English","Missing required 'text' query parameter returns an error","Very short texts (1-2 sentences) may return null for some metrics like SMOG that require a minimum number of sentences","Payment not processed results in 402 response before analysis is run"],"whenToPreferThis":"Choose this endpoint when you need a comprehensive, multi-index readability assessment of English text in a single call — especially when you want Flesch, Gunning Fog, SMOG, and Coleman-Liau scores together alongside human-readable advice and time estimates. Prefer it over manual formula implementations or single-metric tools when you need a consensus grade level and actionable writing suggestions in one lightweight API call.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-18T12:56:42.609Z","isFirstParty":false,"canonicalSlug":"saylor-innovations-data-desk-text-readability-analyzer-5189371b"}