Botoi Readability API vs Hemingway Editor
Botoi Readability API
botoi.com
Hemingway Editor
hemingwayapp.comSide by side
| Figure | Botoi Readability API | Hemingway Editor |
|---|---|---|
| Price from | $9/mo | $8.33/mo |
| Free plan | Yes | — |
| Free trial | — | Yes |
| Open source | — | — |
| Web | — | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| API | Yes | — |
| Plans published | 4 | 11 |
| Spec score · AI Readability Checkers | 8.1 (#8) | 8.1 (#9) |
| Spec score · Readability Checkers | 8.2 (#10) | 8.0 (#11) |
| 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. | Hemingway says it does not store document content after processing or use customer writing to train AI models. |
| Purpose | The Readability API analyzes English text and returns Flesch-Kincaid Grade, Flesch Reading Ease, Gunning Fog, and underlying counts. | Hemingway Editor scores writing for readability and highlights sentences and issues that can weaken or complicate a message. |
Plans
Botoi Readability API
- FreeFree
- Starter$9 a month
- Pro$49 a month
- Business$199 a month
Hemingway Editor
- Individual 5K (annual)$8.33 a month
- Individual 10K (annual)$12.50 a month
- Team 10K (annual)$12.50 a month
- Individual 5K (monthly)$10 a month
- Hemingway Editor 3 desktop$19.99, paid once
- Hemingway Editor 3 desktop$19.99 a month
- Hemingway Editor Classic$19.99, paid once
- Individual 5K$100 a year
- Individual 10K$150 a year
- Team 10K$150 a year
In their own words
Botoi Readability API
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.
Hemingway Editor
Hemingway Editor scores writing for readability and highlights sentences and issues that may weaken or complicate a message. Editor Plus adds rewriting for wordy sentences and passive voice, grammar fixes, and controls for tone, length and style. It also provides document review with writing feedback and suggestions, and supports importing and exporting Word, Markdown and HTML files. The Classic desktop app works offline and keeps writing on the computer; it can publish to WordPress or export HTML and Markdown for a blogging platform or CMS. Hemingway Editor is available on web, macOS and Windows. The free plan is available. Individual 5K annual access costs $8.33 a month, billed as 100 USD annually, and includes 5,000 AI sentences per month. Hemingway Editor 3 desktop costs $19.99, paid once and does not include new AI features. Hemingway says document content is discarded after processing and is not used to train AI models. For analysis or rewriting, content is sent through Hemingway to an LLM provider, currently OpenAI, Google or Anthropic, and then discarded. Editor Plus does not yet have SOC 2 or ISO certification.