Chrome DevTools
Used by 10 peopledevelopers.google.com ↗

“On the design side, I prefer to actually just knock-up actual websites to show wireframes, so I'd be lost without Chrome DevTools.”
Frances Berriman Interview, Designer, developer, artist · via Uses This 
“Chrome DevTools is always open when I'm coding.”
Lara Hogan Interview, Front-end developer, performance engineering manager (Etsy) · via Uses This 
“For debugging my code, I find Chrome DevTools indispensable - gotta love that emulator feature!”
Jennifer Wong Interview, Web developer (HotPads) · via Uses This 
“I use the developer tools like web inspector to manipulate mockups or apps locally and then make those changes in my text editor.”
Julie Ann Horvath Interview, Designer, developer (GitHub) · via Uses This