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Botoi Readability API

botoi.com

From $9/mo Free plan API
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Spec score 8.1 #8 of 26 in AI Readability Checkers

What it is

Botoi Readability API analyzes English text and returns Flesch-Kincaid Grade, Flesch Reading Ease, Gunning Fog, and underlying counts. A request sends a required text string to POST /v1/text/readability and receives JSON. Flesch Reading Ease scores run from 0 to 100, with higher values indicating easier reading; Gunning Fog estimates the years of formal education needed. The 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 samples can produce unstable scores. Suggested uses include enforcing plain-language standards, reviewing legal or medical drafts, refining blog posts for SEO, and comparing writing across authors. Examples are provided in cURL, JavaScript, TypeScript, Python, and Go. The Free plan is free and lists 1,000 requests per day and 10 per minute; the endpoint page separately states five requests per minute for its free tier. Starter costs $9 a month. Requests above a per-minute or daily cap receive HTTP 429, and daily limits reset at midnight UTC.

Spec sheet

Purpose
The Readability API analyzes English text and returns Flesch-Kincaid Grade, Flesch Reading Ease, Gunning Fog, and underlying counts.Read 7 Oct 2026 · botoi.com
Privacy
Botoi says API request and response payloads are not stored beyond the time needed to fulfill the request, while API usage metadata is logged.Read 7 Oct 2026 · botoi.com
Company
Botoi is a product of Savi Business Management LLC, with a listed address in Sharjah Media City, Sharjah, United Arab Emirates.Read 7 Oct 2026 · botoi.com
Data protection
The privacy policy says Botoi uses TLS encryption in transit and supports international transfers with safeguards including Standard Contractual Clauses where applicable.Read 7 Oct 2026 · botoi.com
DPA
Business customers processing their own users’ personal data through the API can request a Data Processing Agreement by email.Read 7 Oct 2026 · botoi.com
Endpoint
The endpoint is POST /v1/text/readability, accepts a required text string, and returns JSON.Read 7 Oct 2026 · botoi.com
English calibration
The formulas and syllable heuristics are calibrated for English, and the grade mapping is not meaningful for other languages.Read 7 Oct 2026 · botoi.com
Free access
The endpoint page says the free tier includes 5 requests per minute with no credit card required.Read 7 Oct 2026 · botoi.com
Input guidance
Botoi recommends sending at least 100 words because short snippets can produce unstable scores.Read 7 Oct 2026 · botoi.com
Integration
The product page provides cURL, JavaScript, TypeScript, Python, and Go examples.Read 7 Oct 2026 · botoi.com
Plan limits
The general pricing page lists the Free plan at 1,000 requests per day and 10 requests per minute.Read 7 Oct 2026 · botoi.com
Rate limits
Requests exceeding a per-minute or daily cap receive HTTP 429, and daily limits reset at midnight UTC.Read 7 Oct 2026 · botoi.com
Scoring details
Flesch Reading Ease ranges from 0 to 100, with higher scores indicating easier reading; Gunning Fog estimates years of formal education needed.Read 7 Oct 2026 · botoi.com
Use cases
Botoi suggests using the API to enforce plain-language standards, review legal and medical drafts, optimize blog posts for SEO, and compare writing across authors.Read 7 Oct 2026 · botoi.com

Plans and prices

Free Free 1,000 requests/day · 10 req/min · All 150+ endpoints · MCP server access · JSON responses · Community support Read 7 Oct 2026 · botoi.com
Starter $9 a month 10,000 requests/day · 30 req/min · All 150+ endpoints · MCP server access · JSON responses · Email support · Usage dashboard Read 7 Oct 2026 · botoi.com
Pro $49 a month 100,000 requests/day · 300 req/min · All 150+ endpoints · MCP server access · JSON responses · Priority support · Usage dashboard · Webhook notifications · 99.9% uptime SLA Read 7 Oct 2026 · botoi.com
Business $199 a month 1,000,000 requests/day · 1,000 req/min · All 150+ endpoints · MCP server access · JSON responses · Dedicated support · Usage dashboard · Webhook notifications · 99.9% uptime SLA · Custom rate limits Read 7 Oct 2026 · botoi.com

Every Botoi Readability API plan and price →

Strong points and limits

Strong points

  • Returns three readability formulas and underlying counts.
  • JSON endpoint accepts a text string.
  • Examples cover five programming environments.
  • Free plan lists 1,000 requests per day.

Limits

  • Scoring is calibrated for English only.
  • Short texts can produce unstable scores.
  • Free request limits differ between listed pages.

Who it suits

It suits developers adding English readability scoring to a service or workflow. The API may also help teams reviewing legal, medical, or web copy, provided they account for the English calibration and request limits.

Verdict

The API provides several English readability measures through a single JSON endpoint, with examples for common development environments. Check the applicable free-tier rate limit before relying on a request volume.

Where Specifiction places it

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