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CSSViewer VS Responsive Tool

Compare CSSViewer VS Responsive Tool and see what are their differences

CSSViewer

A simple CSS property viewer

Rating
0 reviews
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Alternatives Is it good?
Responsive Tool

Responsive Tool is a free responsive website checker — test your website on mobile, tablet, and desktop at once, no signup, no download.

Rating
0 reviews
Pricing
Free
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Alternatives Is it good?
ASocks
Clear, Fast & Unlimited. Residential & Mobile Proxies For Best Price. sponsored
Note: These products don't have any matching categories. If you think this is a mistake, please edit the details of one of the products and suggest appropriate categories.

Which is more popular?

Based on our record, CSSViewer seems to be more popular. It has been mentioned 5 times since March 2021.

social mentions
5 vs 0
Design Tools popularity
100% vs 0%
alternatives listed
91 vs 16

Base details

Website, pricing, platforms and company facts side by side.

CSSViewer
Responsive Tool
Website chromewebstore.google.com responsivetool.com
Pricing —
Free
Company — Startup from the United States · 1 - 9 employees · 2026
Listed in
Development Developer Tools CSS Framework Design Tools +1
Testing Website Testing

About CSSViewer and Responsive Tool

In their own words, as submitted to SaaSHub.

CSSViewer
Responsive Tool

No description of CSSViewer yet.

Responsive Tool lets you paste a URL and preview it across real device viewport sizes — phone, tablet, desktop, or a custom width — side by side in live, interactive iframes you can scroll and click through, not static screenshots. It includes 20+ named device presets plus one-click jumps to...

Read more about Responsive Tool

Features and specs

What each product offers, as listed by its team.

CSSViewer 4 features
Responsive Tool 5 features
  • Ease of Use
    CSSViewer offers a simple and intuitive interface that allows users to easily inspect CSS properties of web elements by hovering over them.
  • Quick Access
    The extension provides quick access to CSS properties without the need to open the browser's developer tools, saving time for developers and designers.
  • Detailed Information
    CSSViewer displays detailed CSS information, such as font, color, and box properties, which can be useful for debugging or learning CSS.
  • Lightweight Tool
    The extension is lightweight and doesn't require significant system resources, making it a convenient tool for front-end developers.

Possible disadvantages

  • Limited Functionality
    CSSViewer is limited to viewing CSS properties and does not allow users to edit them directly or offer any advanced features available in full-featured developer tools.
  • Browser Compatibility
    The extension is explicitly designed for Google Chrome, which means users of other browsers may need to look for alternatives.
  • No Updates or Support
    Users have reported that CSSViewer lacks regular updates, which may lead to compatibility issues with newer versions of Chrome or fails to support newer CSS features.
  • Potential Security Risks
    As with any third-party extension, users need to be cautious about permissions and potential security risks associated with installing and using such tools.
  • Device Presets
    20+ real phone, tablet, and desktop viewport sizes
  • Custom Width
    Enter any exact pixel width to test, not just presets
  • Breakpoint Testing
    One-click jumps to common CSS breakpoints at -1px/exact/+1px, so you can check the edge, not just the round number
  • Live Preview
    Free, no signup or install required
  • Shareable Setup Links
    Copy a link that reproduces your exact comparison — same URL, same devices, same custom widths — for anyone who opens it

Videos

Walkthroughs and reviews on video.

CSSViewer 0 videos + Add
Responsive Tool 1 video + Add

No CSSViewer videos yet. You could help us improve this page by suggesting one.

Responsive Tool — Test Your Website on Mobile, Tablet & Desktop Side by Side

Category popularity

How often each product is chosen within a category, 0–100% relative to the other.

Score bands 0–20 21–40 41–50 51–60 61–100
CSSViewer
Responsive Tool
100% 100%
Design Tools
0% 0%
0% 0%
Website Testing
100% 100%
100% 100%
Developer Tools
0% 0%
0% 0%
Testing
100% 100%

Questions & Answers

As answered by people managing CSSViewer and Responsive Tool.

Which are the primary technologies used for building your product?

Responsive Tool's answer:

Next.js, React, TypeScript, Tailwind CSS, deployed on Cloudflare Workers.

What makes your product unique?

Responsive Tool's answer:

It renders live, interactive iframes side by side — not static screenshots — across real device viewport sizes, with one-click jumps to common CSS breakpoint boundaries (e.g. 767/768/769px) so you can test right at the edge, not just round numbers. You can also copy a link that reproduces your exact comparison (same URL, same devices, same custom widths) for anyone else to open.

Why should a person choose your product over its competitors?

Responsive Tool's answer:

Most cross-browser/device testing platforms (BrowserStack, LambdaTest, etc.) are built for QA teams running automated test suites across real device clouds — paid, feature-heavy, and overkill for a quick visual check. Responsive Tool is free, requires no signup, and is built specifically for one thing: seeing how a page looks across device sizes at a glance.

How would you describe the primary audience of your product?

Responsive Tool's answer:

Indie developers, freelancers, and small teams who need a fast, free way to sanity-check a responsive layout without setting up a device lab or a paid testing platform.

User comments

Share your experience with using CSSViewer and Responsive Tool. For example, how are they different and which one is better?

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Social recommendations and mentions

Recommendations tracked on public social media and blogs since March 2021.

CSSViewer 5 mentions
Responsive Tool 0 mentions
  • 7 Must Have Chrome Extensions for JavaScript Developers
    The "CSS Viewer" Chrome extension is a handy tool for JavaScript developers seeking to inspect and analyze CSS styles on web pages. With a simple click on the extension's icon in the Chrome toolbar, it provides a user-friendly interface... - Source: dev.to / over 3 years ago
  • 20 Top Best Chrome Extensions for Web Developers in 2022
    CSS Viewer is a simple but very effective Chrome extension for web developers. As its name implies, this addon shows you the CSS properties of a given page wherever you hover your mouse. A small popup window appears showing you the CSS... - Source: dev.to / over 4 years ago
  • Top 10 Chrome Extensions for Web Developers in 2022
    1 - CSSViewer : It allows to show the CSS properties of element on any webpage, you just hover your mouse on it . A small window appears showing you the CSS data . - Source: dev.to / almost 5 years ago

View more

Tracking Responsive Tool since Oct 2026.

Alternatives to CSSViewer and Responsive Tool

When comparing CSSViewer and Responsive Tool, you can also consider the following products.

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