3 enginesLens and Prism
Test your website on Safari without a Mac.
Cross browser testing without a device lab. Most layout bugs that slip through are Safari bugs, the ones clients find on their iPhones. UICheck runs the same checks in Safari’s engine, Firefox and Chrome, with screenshots for each.
- 3
- browser engines
- 0
- Macs needed
- 1
- report per browser
Why it matters
What breaks only in Safari (and Firefox)
100vh and the toolbar
On iPhone, 100vh includes the area behind Safari’s toolbar, so full-height sections and sticky bars land in the wrong place.
Zoom on form fields
Fields with text under 16px make iPhone Safari zoom in when tapped, and visitors have to zoom back out.
Different text wrapping
Font rendering and line breaking differ slightly, so a heading that fits in Chrome can wrap or clip in Safari.
Form controls look different
Dates, selects and buttons use Safari’s own styles unless reset, which can break alignment.
Newer CSS support
Some newer properties arrive in Safari later, or need -webkit- prefixes, so layouts relying on them can fall back unexpectedly.
Firefox differences too
Scrollbars take space, form controls and fonts render differently, and some layouts overflow only in Firefox.
Cross-browser testing
Three real browser engines
ChromeChromium
Chrome, Edge, Samsung Internet and most Android browsers.
SafariWebKit
Safari on Mac, and every browser on iPhone and iPad.
FirefoxGecko
Firefox on desktop and Android.
Honest limits: these are the real engines, not physical devices. They catch layout and rendering differences; for device features such as Apple Pay, the camera or the on-screen keyboard, also try a real phone.
How it works
Three browsers, the same checks, one report
No Mac, no iPhone and no device lab. Everything runs on our servers.
Step 2
Pick Safari or Firefox
Choose the browser next to Chrome, then the phone, tablet and desktop sizes.
See plansStep 3
Compare the results
Screenshots and findings per browser, so bugs that happen only in Safari stand out.
See a report
Questions
Is it real Safari?
It uses WebKit, the engine inside Safari, run by Playwright. It catches rendering and layout differences. For device features such as Apple Pay or the camera, test on a real iPhone too.
Can I test Safari on Windows?
Yes. Everything runs on our servers; you only need a browser to paste the URL and read the report.
Do I get separate results per browser?
Yes. Each browser gets its own screenshots and findings at every screen size, so differences stand out.
Does Firefox emulate phones?
Firefox gets the phone width and touch, but it has no mobile emulation of its own, so phone checks are most accurate in Chrome and Safari.
Which plans include it?
Safari and Firefox are part of Lens and Prism. Free checks use Chrome.
Catch the iPhone bugs before your client does
Lens is $5 a month: Safari and Firefox, every screen size, the breakpoint sweep and full-site checks.