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Landing page analyzer Answer a series of questions to know how effective is your landing page on industry's best practices. Run tool → Test significance calculator For given number of trials and conversion rate, want to know if the results are statistically significant? Run tool → A/B Ideafox Get ideas for A/B, split and multivariate tests by reading case studies sorted by industry and problem type. Run tool → Test duration calculator Calculate the number of days you will need to run your A/B split test in order to get reliable results. Run tool →

ptimize CSS via URI or via File Upload or via Direct Input

HTML Purifier is a standards-compliant HTML filter library written in PHP. HTML Purifier will not only remove all malicious code (better known as XSS) with a thoroughly audited, secure yet permissive whitelist, it will also make sure your documents are standards compliant, something only achievable with a comprehensive knowledge of W3C's specifications. Tired of using BBCode due to the current landscape of deficient or insecure HTML filters? Have a WYSIWYG editor but never been able to use it? Looking for high-quality, standards-compliant, open-source components for that application you're building? HTML Purifier is for you!

This SEO Analysis Tool is to help you analyze and measure the ranking potential of your web pages. It doesn't only analyze the Meta Tags of your pages, rather it tries to use the same spider technology as the search engines spiders them self.

GTmetrix uses Google Page Speed and Yahoo! YSlow to grade your site's performance and provides actionable recommendations to fix these issues.

Quick.as allows you to create a homepage or "personal portal" that is accessible on your computer or mobile phone. It allows user to quickly access sites optimized for the device that they are using (e.g. iphone.ebay.com for an iPhone and m.ebay.com for a RAZR, etc.).

Still prefer Yubnub, the SOCIAL command line of the web but maybe some prefer this one…

One Homepage For All Devices Access your customized homepage from any device. Increase your browsing productivity.