Sizzy Alternatives

The browser for ambitious web developers that want to 5× their quality and efficiency.

paid Free Trial $9.0 / Monthly (Individual user)

Browsershots makes screenshots of your web design in different browsers.

Flagsmith lets you manage feature flags and remote config across web, mobile and server side applications. Deliver true Continuous Integration. Get builds out faster. Control who has access to new features. We're Open Source.

Try for free Open Source freemium

Develop responsive web-apps 5x faster!

Open Source free

Test mobile or web apps instantly across 700+ browser/OS/device platform combinations - without infrastructure setup.

Live interactive cross-browser testing from your browser.

Browser Testing made simple! Run automated, visual, and manual tests on 1500+ real browsers and mobile devices. Test more browsers, in less time.

litmus tests and tracks your email campaigns, so you can always put your best design forward.

BrowserStack is a software testing platform for developers to comprehensively test websites and mobile applications for quality.

Open Source freemium $29.0 / Monthly (Starts at single user plans and billed annually)

Responsive Web Design, Mobile & Cross-Browser Compatibility Testing Software.

LT Browser is a free dev friendly browser for developers and testers. You can see mobile view of website on different screen sizes and resolution on 50+ pre installed view ports. You can build, test and debug your website faster then ever.

Testize gage your webpage’s ease of use against at present acknowledged Internet gauges to recognize website appropriateness over numerous cell phones and programs.

webcheck.me Free online website scanner. Checks security, seo, performance and mail problems.

Test the spamminess of your email