Responsive Website Test VS Webflow Flexbox UI Builder

Test any website on desktop, mobile, and tablet

Build flexible, responsive layouts — without writing code

Ease of Use
The tool offers a user-friendly interface, making it simple for users to input a URL and quickly see how their website appears on various screen sizes.
Multiple Device Views
This tool allows users to simulate how a website looks on multiple devices, including different smartphones and tablets, which is crucial for responsive design testing.
Real-time Testing
Users can see changes and updates in real-time as they adjust the design of their website, providing immediate feedback on responsive design adjustments.
No Installation Required
Being an online tool, it requires no software downloads or installations, allowing users easy access from any web browser.

Limited Functionality
While great for visual checks, the tool might not provide detailed insight into performance issues or deeper technical aspects of responsive design.
Requires Internet Connection
As an online tool, it requires a steady internet connection to function, which can be a drawback in areas with poor connectivity.
Privacy Concerns
Since the tool processes website data online, there could be potential privacy concerns for sensitive website content.
No Offline Access
Users cannot utilize the tool when offline, which limits its availability and convenience compared to some desktop-based testing tools.

User-Friendly Interface
Webflow's Flexbox UI Builder offers a visually intuitive way to manage CSS flexbox layouts, making it easier for designers to create complex responsive designs without writing code.
Real-Time Preview
The builder provides real-time visual feedback, allowing users to see the changes as they manipulate the flexbox properties, greatly enhancing the design process efficiency.
Advanced Customization
The tool provides flexible options for customizing layouts, enabling designers to create highly specific and unique designs that adhere to the responsive design requirements.
Time-Saving
It significantly reduces the time needed to design flexbox layouts by eliminating the need to manually write and test flexbox code, which can be quite complex.
Educational Resources
Webflow offers extensive educational resources and tutorials about using the Flexbox UI Builder, which helps users effectively understand and implement flexbox principles.

Steep Learning Curve
For those completely new to flexbox or web design, there might be an initial learning curve to fully understand all of the features and capabilities of the builder.
Limited to Webflow Environment
The tool is part of the Webflow ecosystem, meaning designers are tied to Webflow's platforms for both design and hosting, which may limit flexibility for those who prefer other environments.
Dependency on Internet
Since it's an online tool, a stable internet connection is necessary, which can be a disadvantage in environments with unreliable connectivity.
Subscription Costs
While Webflow offers a free tier, advanced features—including those related to flexbox—may require a subscription, potentially increasing costs for design teams or freelancers.
Mobile Responsiveness Adjustments
Although the Flexbox allows for responsive design, complex layouts sometimes need additional tweaks in Webflow's designer to ensure that they work seamlessly across all devices.