
JSON Formatter & Validator
DevTools Advanced
JSONFormatter.org
FreeFormatter
JSON Editor Online
SmallDevTools
TheDevTools
FOSS tools for developers

Responsive Viewer
OneTab
Polypane
Sizzy
Leafovers
BrowserStack
Side Space
Preview and debug responsive designs faster with Pixefy. View multiple devices side by side, sync scrolling and clicks, edit styles live, and ensure accessible, seamless experiences across every screen.
Which is more popular?
Website, pricing, platforms and company facts side by side.
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|---|---|---|
| Website | developertools.tech | pixefy.io |
| Pricing | ||
| Platforms | — | |
| Company | — | Startup from Lithuania · 2023 |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of DeveloperTools.Tech yet.
Pixefy is a responsive design testing tool that helps developers and designers preview, inspect, and edit websites across multiple devices in real time. View all screen sizes side by side, sync interactions, and test layouts faster with built-in accessibility checks, X-Ray mode, adaptive grids,...
What each product offers, as listed by its team.


Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing DeveloperTools.Tech and Pixefy.
Pixefy's answer:
Reviewing and testing websites can be overwhelming, especially for those who built them. After trying various tools and extensions to speed up the process, none met our need for speed. That’s why Pixefy was created—with a focus on accelerating testing and audits efficiently
Pixefy's answer:
It has an intuitive interface, is easy to use, feature-packed, and free to use
Pixefy's answer:
Pixefy offers a faster, more intuitive workflow than many competitors by combining multi-viewport previews, synced interactions, split-screen mode, accessibility tools, and real-time editing in a single tab. Instead of switching between devices, windows, or separate tools, users can see, test, and adjust everything at once – saving time and reducing friction in the development process.
Pixefy's answer:
Front-end developers, web designers, and UI/UX professionals who need to quickly test and perfect responsive layouts are Pixefy’s primary audience. It also serves QA testers, accessibility specialists, and digital agencies that require accurate multi-device previews, synchronized interactions, and built-in tools for debugging and accessibility compliance.
Pixefy's answer:
Pixefy stands out by combining responsive testing, live editing, and accessibility checks in a single, streamlined workspace. With synced interactions across multiple viewports, macOS-style split-screen resizing, built-in blindness simulation, and an Activity Tab to track every change, it goes beyond standard preview tools – allowing developers and designers to test, debug, and optimize without switching between multiple apps or windows.
Share your experience with using DeveloperTools.Tech and Pixefy. For example, how are they different and which one is better?
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