Readability Checker

I do not use readability checkers to reach a target score. I use them to find sentences that read harder than the rest of the paragraph. Last month I edited a 1,200-word guide on choosing a domain name. Hemingway flagged 16 sentences as 'very hard to read'. Most were compound sentences I could split. After rewrites, the average sentence length dropped from 19 to 13 words. The grade level moved from grade 11 to grade 8. The page now gets better time on page, though I cannot attribute that entirely to readability – it probably helped. I usually pair this check with other tools from the [SEO Tools](/seo-tools/) lab. The most common metrics are Flesch Reading Ease and Flesch-Kincaid Grade Level. They correlate roughly with years of education needed. For a general web audience, a Flesch-Kincaid grade of 8–9 is a reasonable target. But I do not stop when I hit that number. I stop when the flagged sentences are gone. One concrete use case: for a product description aimed at non-specialists, I enforce a hard sentence limit of 20 words. The checker helps enforce that. It is also good for training writers new to web content. They can see instantly that their academic style needs breaking up. A quick run through Hemingway often converts a wall of text into something scannable. The key is to treat the score as a hint, not a verdict.

The main trouble with readability checkers is that they cannot tell whether a complex sentence is necessary or just sloppy. I tested a page from a legal blog about GDPR compliance. The text scored grade 15 on Flesch-Kincaid. Simplifying it to grade 9 would have removed critical legal phrasing. Another awkward situation is poetry or creative copy. A readability checker will hate it. That does not mean the copy is bad. Also, checkers ignore formatting, headings, bullet points. I once had a page with short lists and descriptive subheadings; the checker gave a poor score because of long words, but the page was easy to scan. Different formulas give wildly different results. For the same 500-word sample, I have seen Flesch-Kincaid grade 9 and Gunning Fog grade 14. Which one do you follow? Neither. You read the sentences yourself. If you need deeper content analysis, something like [Semrush](/semrush/)'s SEO Writing Assistant gives readability alongside tone and keyword targets – but that is a different beast. My decision rule: if your content is technical, legal, or academic, do not let the readability score dictate rewrites. Keep the necessary terms and shorten only the structure around them. I also find that readability checkers lead people to obsess over grade level at the expense of meaning. They ask 'how do I get this to grade 8?' instead of 'does this paragraph make sense?'. The former question is easier to automate, but the latter matters more. If you are editing for a niche audience, trust your judgement over the tool.

My go-to readability tool is Hemingway App. It highlights sentences in yellow and red, and it gives a grade level. That is enough for most editing sessions. Readable is better for an organisation that needs to audit many pages at once. It offers a dashboard and can crawl a sitemap. But for a single piece, Hemingway is faster. Another alternative is reading the content aloud. I sit at my desk and mutter through the draft. Any sentence that makes me pause is a prime candidate for rewriting. No formula can replicate the ear. If you want to see whether readability actually affects engagement, set up a recording tool such as [Hotjar](/hotjar/) or [Microsoft Clarity](/microsoft-clarity/). Watch where users drop off. You might find that readability is not the issue at all – it could be layout or navigation. [Surfer SEO](/surferseo/) includes a readability check within its content editor. I use it when I need a second opinion without leaving the editor. My decision rule: choose your tool based on your workflow. Use Hemingway for quick fixes, use Readable for reports, and use user recordings for evidence. If you are running a large content operation, consider a custom script that extracts sentences above a certain length and flags them. But for most of my writing, a manual read and a Hemingway pass catch 90% of the problems.