Keyword Density Checker - Online SEO Text Analyzer
Analyze text for keyword frequency and density. Highlights over-optimized terms. Perfect for content writers and SEO editors. Entirely browser-based.
UD5 Toolkit
Free instant SEO & performance audit. Analyze on-page SEO, mobile friendliness, security, and more in seconds.
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<link rel="canonical">) tells search engines which version of a page is the "master" copy when duplicate or similar content exists across multiple URLs. Use canonical tags to consolidate ranking signals and prevent duplicate content penalties, especially for e-commerce product pages with filter parameters or pagination.
Analyze text for keyword frequency and density. Highlights over-optimized terms. Perfect for content writers and SEO editors. Entirely browser-based.
Enter a URL and fetch its text/background colors to perform a bulk contrast check. See warnings for WCAG violations.
Paste any article and get a list of the most relevant keywords using a simple TF‑IDF‑like model. Skip stop words. All local.
Paste your email body and subject, and get a spam score based on common trigger words and patterns. Improve your cold outreach.
Check if a website is globally reachable or experiencing issues. Status code and latency displayed. Quick browser-side test.
Paste HTML or Markdown to count total words, unique words, heading distribution, and reading time. Content audit helper.
Check if the current page can be loaded offline by examining the service worker cache. Developer tool for PWAs.
Measure your internet connection speed by downloading and uploading a small test file. Works from your browser.
Paste text to compute reading ease and grade level using Flesch-Kincaid, SMOG, and ARI. Improve your writing clarity. All in browser.
Paste a Content‑Security‑Policy header and get a human‑readable breakdown. See potential risks and suggestions.
Detect browser support for font‑tech() and font‑format() values in @font‑face src. Check COLRv1, variable, etc.
Paste text to accurately count sentences, average sentence length, and longest sentence. For editors and writers.
Enter a URL and see its favicon at all standard sizes. Check if it's properly defined. SEO basic check.
Compare renting to buying a home by entering price, rent, interest, and years. See which saves more. Simplified model.
Track freezer contents with type, date frozen. See what's been in too long. Simple grid view. Data local.
Paste a list of numbers to visually check uniformity, mean, and simple pattern analysis. Educational tool for statistics and RNG.
Watch for updates to aria‑live regions and log what a screen reader would announce. Debug live regions.
Enter a URL and fetch its Twitter card meta tags. See a live preview of how the tweet will appear. Debug social sharing.
Adjust a brightness threshold slider and see the live vector trace of an image. Export as SVG. Potrace‑style.
Add web content to the device’s content index (like Google Discover). See the indexed items and delete them.
Quickly estimate your internet connection speed by downloading a small test file. See class and recommendations.
Compute multiple readability scores (Flesch Reading Ease, Grade Level, ARI, SMOG). Paste any English text and see which grade level it's suitable for. Local.
Find out if a word is an isogram (no repeating letters). Different types: first-order, second-order. Word nerd fun.
Enter a URL and extract the font stacks and web font URLs used on that page. Quick typography research.
Paste SVG path data and remove unnecessary precision, normalize commands, and reduce size. Helpful for optimizing inline SVGs. Local tool.
Breakdown of expected costs (materials, appliances, etc.) for a tiny house. Adjust percentages or enter custom. Local calculation.
Enter a URL and get a rough client-side performance simulation: request count, DOM size, and potential speed tips. No real Lighthouse.
Based on desired annual income and billable days, calculate your minimum day rate. Don't undercharge.
Request permission and detect when the user is idle (away from keyboard). See screen lock state. For native‑like apps.
Paste text with mixed Arabic/Hebrew and English. See the Unicode bidi class of each character and ordering. i18n debugger.