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Botoi Readability API
What it is
Botoi Readability API analyzes English text and returns Flesch-Kincaid Grade, Flesch Reading Ease, Gunning Fog, and underlying counts as JSON. The endpoint accepts a required text string through POST /v1/text/readability. Flesch Reading Ease runs from 0 to 100, where higher values indicate easier text; Gunning Fog estimates the years of formal education needed to understand it. Botoi recommends sending at least 100 words because shorter samples can produce unstable results. The formulas and syllable heuristics are calibrated for English, so grade mappings are not meaningful for other languages. Suggested uses include applying plain-language standards, reviewing legal or medical drafts, refining blog posts for SEO, and comparing writing across authors. The product page includes cURL, JavaScript, TypeScript, Python, and Go examples. The free plan is listed as free, with 1,000 requests per day and 10 per minute; the endpoint page separately states a 5-per-minute free-tier limit. Paid plans start at $9 a month. Exceeding a daily or per-minute cap returns HTTP 429; daily caps reset at midnight UTC.
For and against
For
- Returns three named readability scores and underlying counts.
- JSON response from a documented POST endpoint.
- Examples cover cURL and four programming languages.
- Free plan lists 1,000 requests per day.
- Payloads are not retained beyond request fulfillment.
Against
- Scoring is calibrated for English only.
- Botoi recommends at least 100 words for stable scores.
- Free-tier per-minute limits differ across listed pages.
- Over-limit requests receive HTTP 429.
The verdict
Botoi Readability API offers a focused way to add English readability scoring to software and editorial workflows. Check the listed free-tier rate limits and consider the language and sample-length constraints before relying on its scores.
Who it suits
It suits developers and teams that need English readability scores in an API workflow, including reviewers of legal or medical drafts and teams comparing writing. Its scores are calibrated for English, and short samples may be unstable.
Plans and prices
Free
1,000 requests/day · 10 req/min · All 150+ endpoints · MCP server access
Read 7 Oct 2026 · botoi.com
Starter
10,000 requests/day · 30 req/min · All 150+ endpoints · MCP server access
Read 7 Oct 2026 · botoi.com
Pro
100,000 requests/day · 300 req/min · All 150+ endpoints · MCP server access
Read 7 Oct 2026 · botoi.com
Business
1,000,000 requests/day · 1,000 req/min · All 150+ endpoints · MCP server access
Read 7 Oct 2026 · botoi.com
On the record
- Company
- Botoi is a product of Savi Business Management LLC, with a listed address in Sharjah Media City, Sharjah, United Arab Emirates.botoi.com · read 7 Oct 2026
- Data protection
- The privacy policy says Botoi uses TLS encryption in transit and supports international transfers with safeguards including Standard Contractual Clauses where applicable.botoi.com · read 7 Oct 2026
- DPA
- Business customers processing their own users’ personal data through the API can request a Data Processing Agreement by email.botoi.com · read 7 Oct 2026
- Endpoint
- The endpoint is POST /v1/text/readability, accepts a required text string, and returns JSON.botoi.com · read 7 Oct 2026
- English calibration
- The formulas and syllable heuristics are calibrated for English, and the grade mapping is not meaningful for other languages.botoi.com · read 7 Oct 2026
- Free access
- The endpoint page says the free tier includes 5 requests per minute with no credit card required.botoi.com · read 7 Oct 2026
- Input guidance
- Botoi recommends sending at least 100 words because short snippets can produce unstable scores.botoi.com · read 7 Oct 2026
- Integration
- The product page provides cURL, JavaScript, TypeScript, Python, and Go examples.botoi.com · read 7 Oct 2026
- Plan limits
- The general pricing page lists the Free plan at 1,000 requests per day and 10 requests per minute.botoi.com · read 7 Oct 2026
- 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.botoi.com · read 7 Oct 2026
- Purpose
- The Readability API analyzes English text and returns Flesch-Kincaid Grade, Flesch Reading Ease, Gunning Fog, and underlying counts.botoi.com · read 7 Oct 2026
- Rate limits
- Requests exceeding a per-minute or daily cap receive HTTP 429, and daily limits reset at midnight UTC.botoi.com · read 7 Oct 2026
- Scoring details
- Flesch Reading Ease ranges from 0 to 100, with higher scores indicating easier reading; Gunning Fog estimates years of formal education needed.botoi.com · read 7 Oct 2026
- 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.botoi.com · read 7 Oct 2026
