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Oanor Readability API

Freemium#21 of 26 in AI Readability Checkers

Oanor Readability API: A low-cost readability API for developers who need formula-based text analysis. Ranked #21 of 26 in AI Readability Checkers by our editors (6.9/10); pricing: Free plan; best for low-cost developers needing formula APIs.

6.9/10Editor score

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Oanor Readability API6.9 Visit Oanor

At a glance

Editor score
6.9 / 10
Pricing
Free plan
Best for
Low-cost developers needing formula APIs
Free plan
Yes
Paid from
€6.80/mo
Readability scores
6 scores
Facts checked
22 Sep 2026

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

Our verdict on Oanor Readability API

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.

Your product? Our editors can test Oanor Readability API in depth and publish a review, labelled as paid · from $149/mo →

Oanor Readability API pricing

Plans Free planFreemium A usable free plan; paid tiers unlock the limits above. Prices checked 22 Sep 2026.

See plans on oanor.com

All 4 Oanor Readability API plans and prices →

Oanor Readability API fact sheet

Free plan	Yes
Paid from	€6.80/mo
Readability scores	6 scores
Grade-level analysis	Yes
Sentence complexity	Not verified
Plain-language rewrites	Not verified
Accessibility guidance	Not verified
Input formats	Api
Deployment	Cloud
Compliance & security	GDPR
Support	Email, Tickets
Built for	Solo, Small business, Mid-market (editorial estimate)
Pricing	Free plan (source)
Website	oanor.com
Facts checked	22 Sep 2026

Alternatives to Oanor Readability API

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Featured on iTechGuides

Oanor Readability API is listed in our AI Readability Checkers directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update