Readability Checker
Model:
Runs entirely in your browser with no server calls. Paste your text and get six readability scores (Flesch Ease, Flesch-Kincaid, Gunning Fog, SMOG, ARI, Coleman-Liau) plus per-sentence difficulty highlights.
Flesch Ease
—0–100 scale
Flesch-Kincaid
—grade level
Gunning Fog
—grade level
SMOG
—grade level
ARI
—grade level
Coleman-Liau
—grade level
Avg sentence length
— wordsAvg syllables / word
—Complex words (3+ syl)
— Verdict & audience
Start typing to see readability analysis.
Per-sentence difficultyHardest sentences highlighted
Advanced options
Result
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Measure the reading level of any text, free, in your browser. No account needed.
How to Use Readability Checker
1
Open Readability Checker
Open Readability Checker on Rewind.ai. No account needed to start.
2
Add your input
Enter your text or upload a file, then set any options Readability Checker offers.
3
Get the result
Readability Checker runs on our own GPU servers and returns a result in seconds. Download it, copy it, or share the link.
Use this tool via API
Call this tool straight from your own scripts. The endpoint follows the OpenAI REST format and signs requests with a bearer token, so client libraries you already use keep working. You are billed the same token rate as the web app.
curl -X POST https://api.rewind.ai/v1/chat/completions/ \
-H "Authorization: Bearer sk-rewind-..." \
-H "Content-Type: application/json" \
-d '{"model": "qwen/qwen-2.5-7b-instruct", "messages": [{"role": "user", "content": "Compute readability indices and per-sentence difficulty..."}]}'Readability Checker FAQ
Readability Checker on Rewind.ai is a free AI tool. There's no charge and no sign up needed to start.
Yes. You get 2,500 free tokens per day to use Readability Checker and every other tool on Rewind.ai. A free account raises that to 5,000 tokens/day. You can buy more starting at $1.
Readability Checker runs open-source AI models on our GPU servers. Send your request and the result comes back in seconds.
No. You can use Readability Checker right away without signing up. A free account doubles your daily usage to 5,000 tokens and saves your history.
Anonymous users get 2,500 tokens/day. Free accounts get 5,000 tokens/day. Tokens reset every 24 hours. Each generation costs ~100-5,000 tokens depending on the operation.
Your data is processed on our servers and isn't stored permanently unless you choose to save it. We don't sell or share it.
Yes. Content from Readability Checker is yours to use for personal or commercial work. The AI models we run are commercially licensed.
Readability Checker matches the quality of paid services because it runs the latest open-source AI models. The difference is you don't pay per use.
Readability Checker runs open-source AI models including Qwen 2.5, FLUX and Whisper. We update to newer models as they ship.
Yes. Readability Checker works in any mobile browser, and the layout adapts to your screen size.
Sign up for a free account to get 5,000 tokens/day, double the anonymous limit. Or buy token packs starting at $5 for 200,000 tokens. See /pricing/ for all options.
Yes. After you generate content, you can download it, copy it, or share it via a unique link. Signed-in users can also view their generation history.
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