Live Site Contrast Checker - Online Audit By URL
Enter a URL and fetch its text/background colors to perform a bulk contrast check. See warnings for WCAG violations.
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.
Enter a URL and fetch its text/background colors to perform a bulk contrast check. See warnings for WCAG violations.
Analyze text for keyword frequency and density. Highlights over-optimized terms. Perfect for content writers and SEO editors. Entirely browser-based.
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.
Enter a URL and click to check if it's reachable from your browser (CORS-limited, uses no-cors fetch). Quick manual test. Local only.
Measure your typing speed in words per minute and accuracy. Random word prompts. Compare results over time. No data sent.
Paste text to compute reading ease and grade level using Flesch-Kincaid, SMOG, and ARI. Improve your writing clarity. All in browser.
Check if the current page can be loaded offline by examining the service worker cache. Developer tool for PWAs.
Fetch a page and list all loaded assets (CSS, JS, images) with their sizes. See total page weight. Quick performance check.
Paste a Content‑Security‑Policy header and get a human‑readable breakdown. See potential risks and suggestions.
Enter a URL and extract meta title, description, OG tags into a readable format. Works via frontend proxy or user pastes HTML. Local.
Fetch and extract all meta tags, open graph tags, and Twitter cards from a live URL. No server proxy, direct browser fetch.
Measure your internet connection speed by downloading and uploading a small test file. Works from your browser.
Based on desired annual income and billable days, calculate your minimum day rate. Don't undercharge.
Enter megapixels and desired DPI to see the maximum print size without upscaling. Quick quality check.
Find out if a word is an isogram (no repeating letters). Different types: first-order, second-order. Word nerd fun.
Paste text, highlight important parts, and extract only highlights. Great for research and studying. Entirely client-side.
Paste SVG path data and remove unnecessary precision, normalize commands, and reduce size. Helpful for optimizing inline SVGs. Local tool.
Track freezer contents with type, date frozen. See what's been in too long. Simple grid view. Data local.
Breakdown of expected costs (materials, appliances, etc.) for a tiny house. Adjust percentages or enter custom. Local calculation.
Paste HTML or Markdown to count total words, unique words, heading distribution, and reading time. Content audit helper.
Analyze text for screen reader friendliness: detect vague link text, missing alt suggestions. Get a report. Local.
Enter hole saw diameter and material to find the recommended RPM and feed pressure. Prevent burning and kickback.
Compare two text blocks and highlight differences line by line. Ideal for code review and document revisions. All diffs computed locally for privacy.
Open your camera and scan barcodes or QR codes in real time. Uses ZXing JS. No data sent anywhere.
Enter a URL and extract the font stacks and web font URLs used on that page. Quick typography research.
Enter a URL and see a simulated preview of how the link will appear on major social platforms. Check tags.
Watch for updates to aria‑live regions and log what a screen reader would announce. Debug live regions.
Convert fuel economy units between miles per gallon (US/UK), liters per 100 km, and kilometers per liter. Useful for international car comparisons.
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.