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Readability check.
No more wall-of-text.

Flesch reading ease, grade level, long-sentence flags, passive-voice incidence, and adverb density — all in one paste. Pure client-side, no signup.

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Words
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Sentences
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Flesch readability

0/100
Very difficult — graduate
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FK grade level

Most LinkedIn / blog audiences want 60+ ease (8th-grade level or below). Marketing copy aims for 70+. Below 50 reads as academic.

Long sentences

≥28 words

No long sentences detected. Paste a draft to scan.

Passive voice

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No sentences yet

Active voice is shorter and clearer. Aim for < 10% passive in marketing copy.

Adverbs (-ly)

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No words yet

Strong verbs beat verb + adverb combos. "Sprinted" reads sharper than "ran quickly".

What the numbers mean

Flesch Reading Ease (0–100, higher is easier)

Combines average sentence length and average syllables per word. Most marketing content lands in the 60–80 range. Below 50 reads as academic — fine for whitepapers, wrong for a LinkedIn post. The formula was published in 1948 and still tracks how readers actually feel about prose.

Flesch–Kincaid Grade Level (US grade)

The same inputs as ease, expressed as a US school grade. 8 ≈ general audience, 12 ≈ professional, 14+ ≈ academic. The rule of thumb: aim two grades below your target reader's actual level. People skim past their working comprehension capacity.

Long sentences (≥28 words)

Eye-tracking studies in newspaper rooms found readability collapses past ~25–28 words per sentence. The fix isn't always splitting — sometimes a long sentence needs the brevity of the next two short ones around it for rhythm. Use this list to find the candidates, not as an order to chop.

Passive voice + adverbs

Heuristics, not rules. Passive voice has its place (when the actor is unknown, irrelevant, or you're being diplomatic). Adverbs are fine in moderation. The score flags incidence so you can scan whether you're leaning on either pattern more than you meant to.

Don't paste each draft. Bake the check in.

Vyrable runs readability, brand-voice match, and AI-citability checks in the editor as you write — and during generation before any draft hits your queue.