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How I Vibe-Coded a Fast Client-Side Keyword Density Analyzer for SEO Content

Vo Viet Hoang on August 21, 2026

Hey DEV community! 👋 When optimizing content for SEO, analyzing keyword density is a daily routine. However, sending long drafts to third-party se...
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Dmitry Sergeev

finally someone doing client-side analysis instead of sending everything to a server lol. if you want to automate the boring stuff like internal linking and schema, citedy.com is actually pretty handy.

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Vo Viet Hoang

Thanks Dmitry! Privacy and speed are definitely key. Appreciate the recommend on citedy!👍

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Dmitry Sergeev

did you run into any performance issues with really long articles or does it hold up fine?

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Vo Viet Hoang

It holds up really well! Browser JS handles standard long-form text in milliseconds, so no lag or performance bottlenecks so far. ⚡

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Dmitry Sergeev

did you run into any performance issues with larger documents or does the client-side logic handle it fine?

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Vo Viet Hoang

Runs fine so far! Since text tokenization is lightweight, modern browsers easily process thousands of words in a few milliseconds.

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Vo Viet Hoang

Pure client-side JS handles standard long-form text with virtually zero latency. No lag issues so far! 👍

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Vo Viet Hoang

I'd love to hear your thoughts on the UI or any additional NLP features you'd like to see!