Oanor Readability API review
A low-cost readability API for developers who need formula-based text analysis.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Oanor Readability API is a developer-focused service for analyzing text through an API. It calculates six standard readability formulas—Flesch Reading Ease, Flesch-Kincaid Grade, Gunning Fog, SMOG, Coleman-Liau, and Automated Readability Index—and returns word, sentence, syllable, character, and complexity counts. The service also provides averaged grade-level analysis, estimated reading time, and a plain-English reading-ease interpretation. It is suited to content, copywriting, SEO, editorial, education, accessibility, and UX-writing workflows that need programmatic readability data.
Pricing is structured across four monthly plans. Free includes six formulas and counts, with no credit card required. Starter costs €6.80 per month and adds reading time, syllables, and email support. Pro costs €21.50 per month and is aimed at editorial and SEO pipelines with priority support. Mega costs €56.80 per month and adds content-platform scale and a dedicated SLA. This progression makes the product accessible for lightweight development work while offering higher-tier support and operational positioning for larger content workflows.
The API accepts text through query parameters or request bodies and provides analyze, syllables, and metadata endpoints. Separate syllable-counting support can help applications assess words and phrases beyond full-text readability analysis. Its narrow, API-only design is a good fit for developers embedding formula-based scores into content, education, accessibility, or editorial systems. Choose it when structured readability outputs and low entry pricing matter; choose an alternative when the workflow requires rewriting, a visual interface, or listed integrations.
Oanor Readability API pros and cons
- Where it wins
- Six named readability formulas plus averaged grade-level analysis
- Free tier with six formulas and counts and no credit card
- Multiple endpoints for analysis, syllables, and metadata
- Where it doesn't
- API-only product without a visual editing interface
- Does not provide rewriting features
- No integrations are listed
Oanor Readability API fact sheet, pricing and score →
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