7 Best Shopify CSS Editor Apps - 2026
Last modified: January 6, 2025
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Critical CSS
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Vitals: 40+ Marketing Apps
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Pagespeed Optimizer ‑ JS & CSS
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Custom Css Pro
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Custom CSS Editor & Minify
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Custom CSS & JS
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EasyCode ‑ Custom CSS
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Critical CSS
This app works by preloading all the visual content that the user sees when they navigate to your website, and then downloads the rest of the content in the background. This means that when you have a user on your website, they will have an improved experience on your store locator.
This is all done thanks to some Critical changes that are made to the CSS of the website. And there are lots of benefits of this app. For one, speed is improved and this can lead to better results for your website. Customers love a fast website. For every second that it takes for your website to load, you will lose 7% of your revenue. Most websites load within 8-11 seconds, but this app can drastically reduce that, allowing you to earn a lot more revenue.
In addition, speed is linked to your ranking on Google. If you can improve your website’s speed, you can improve your website’s ranking on Google and other search engines. Therefore, using this custom CSS option, you can have a more customized website with more traffic. More traffic will generate more revenue for your website with ease.
Critical CSS Highlights:
- Improve your site’s speed with custom CSS that is added to your store to improve its performance.
- Can help you maintain more visitors to your website by speeding up loading times.
- More revenue can be generated because the speed of your website is linked to revenues.
- Rank higher on Google and other search engines that will lead to better traffic and more sales.
Vitals: 40+ Marketing Apps
Vitals is one of the top apps that you can use on your Shopify store. There are more than 40 apps within this bundle that can help you create everything from a customized look to your website to getting customers to add reviews about your brand online.
The theme is designed for you to improve the sales on your website. You can add upselling and cross-selling opportunities. These can be added throughout your store, but are very effective when they’re added to your checkout process. At the same time, you can import reviews from places like AliExpress, Loox, Stamped or Yotpo.
Add more value to the cart by getting customers to buy more with FOMO options with stock scarcity and countdown timers. You can also offer volume discounts and quantity breaks with tiered pricing. There is also a product bundle builder that can help you build more options for the customers to be rewarded for buying in bulk.
You are also able to provide great customer support through Facebook Messenger, WhatsApp, Instagram and SMS. This app also allows you to have a site that has improved SEO. With more traffic, you can build a better and strong business.
Vitals: 40+ Marketing Apps Highlights:
- Can improve your business’s ranking on Google and other search engines with ease.
- Can collect reviews directly from customers or from services like AliExpress and more.
- Add scarcity and urgency to get more conversions on your website that can earn you more profit.
- Add custom features to your website.
Pagespeed Optimizer ‑ JS & CSS
Pagespeed is a very important aspect of running your business. For every second that your website takes to load, you will lose 7% of your revenue. It can also lose you the position of your website. This can be a very bad prospect for those who need high levels of traffic for getting the most from their website. This app allows you to have customized CSS and JavaScript that is optimized for performance on your website.
By optimizing your website’s speed, you can rank your landing page higher. You can also expect that your customers will have a better performance. One of the important aspects of this is that it can also help to manage the extra coding that has been added to your website through apps that you have installed. Apps install JavaScript to your homepage, even if it isn’t needed there. By using this app, you can customize that so you can reduce it and improve the loading speed.
The results from this have been seen on numerous websites. Some websites have gotten their page speeds from 30 to 90 just by installing this app. This has helped them not just climb the ranking on Google, but also by getting the website to the first page of Google.
The app is fast working. It will start working as soon as you’ve installed the app, making it one of the fastest-acting apps on the store.
Pagespeed Optimizer ‑ JS & CSS Highlights:
- Improve your website’s speed by customizing the CSS and JavaScript of your website.
- You can remove unwanted code from your homepage to improve the speed of your website.
- Improving your speed will help you rank higher on Google and other search engines.
- Faster loading times will also help with conversions on your website.
Custom Css Pro
This app will help you make cosmetic changes to your Shopify store to have it look exactly how you would like it to. This can be applied to any theme or Shopify website, and you can use CSS code to make that happen. Therefore, you can be very accurate with the changes and ensure that any customizations are exactly as you see fit.
The custom CSS Pro app will load directly into your Shopify admin area and looks just like a simple editor. This will allow you to use CSS to hide elements on your homepage, change fonts, use new colors, change styles and more. There are also pages that this app can make adjustments too.
This app allows you to make changes to the theme without making adjustments to the theme files. This is really important because by making changes to the theme files, you can actually break the website if you don’t do it correctly. The pro editor offers lots of functionality that can be one of the best features and editors that is on the list. You can copy, paste and more within the editor.
The installation of this app is really quick. It doesn’t take that long, and you don’t need to add any configuration to the app to make it work. As soon as it is installed, all you need to do is open the editor on the admin page. And if you ever want to uninstall the custom CSS Pro app, you will need to remove the custom code from your website, otherwise, you could break your website.
Custom CSS Pro Highlights:
- Easy to install on your website.
- Make lots of customization to make your website better.
- Install and go technology to make your website more functional.
- If you want to uninstall the app, be sure that you remove all of your website’s custom CSS code.
Custom CSS Editor & Minify - Inactive
Not every brand you have has every look and style that you want. But sometimes getting close is as good as you’re going to get with your choices/budget. However, if you’ve not found the theme with all the functional styles that you want, there is a way to improve your website with this app. This app works with every theme on Shopify and can help those who have even just the most basic CSS skills to add code and publish changes.
The app is fully integrated into Shopify, giving you the chance to make changes to your website without touching the more complicated liquid files. You can change many aspects of the store design from the fonts, colors and styles.
The app allows you to override theme styles without touching the theme files. There is no risk that any changes that you make can damage your website. The theme also works with a responsive design.
Custom CSS Editor & Minify Highlights:
- Customize any elements of your website with the app.
- Make numerous changes to the fonts, colors and styles of an app.
- Protection from damaging your website.
- Those with the most basic CSS skills can use this app.
Custom CSS & JS - Inactive
This app allows you to customize your theme exactly how you want it. Not only can you add custom CSS to watermark your store’s programming, but you can also add new JavaScript to insert product video on your site. All you need to do is to open up the easy-to-use code editor and then enter the code that you need to add.
The plugin has been designed to meet the needs of administrators. The styles and JavaScript that can be added to your site will be stored within the theme files. Therefore, this reduces the loading times for your website and improve the experience for customers. So you can expect higher levels of conversion and more revenue for your website.
Custom CSS & JS Highlights:
- Add your own custom CSS for adding your own unique style to the website.
- Add your own JavaScript for the website to have a unique image that you’ve entered.
- Easy to use code editor that anyone can use.
- Files are stored within the website theme files for improved speed.
EasyCode ‑ Custom CSS - Inactive
This is a very simple custom CSS app that allows you to add an override to the store’s theme that allows your design decisions to take precedence over the store’s default options. There are lots of features of this app that make it a great choice for your website. For instance, there are useful code syntax highlights for improving the building of your website. And there is error checking on your website’s code to ensure that you don’t have a problem with your store when the custom code has been installed. The app requires no configuration for it to work on your website. All that is needed is for you to install it on your website.
There is a native interface that has been built on the native Shopify UI.
There are numerous benefits of this app. It allows you to make changes to your fonts, colors, styles or even just hide elements on any page of your website. And you don’t need to edit the theme files to make this happen, which means there is a limited chance that you can break your website. Finally, there is copy and paste functionality.
EasyCode ‑ Custom CSS Highlights:
- There is a native interface that has been built on the Shopify user interface.
- There is a limited chance that your website can break.
- Lots of functions to make your website more stylish and match exactly what you want.
- No configuration is required for the app to work on your website.
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Do Shopify CSS editor apps support advanced CSS3 features?
Yes, many CSS Editor Apps support advanced CSS3 features, enabling modern design elements. This includes animations, transitions, and responsive design features for cutting-edge website aesthetics.
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Are there limitations to what CSS editor apps can do on Shopify?
Yes, CSS Editor Apps may have limitations based on Shopify’s platform constraints. These limitations are often related to security, performance, and maintaining a consistent user experience.
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Can Shopify CSS editor apps help with A/B testing design changes?
Yes, some CSS Editor Apps offer features that help with A/B testing design changes. This helps in analyzing which design elements work best for your audience.
Conclusion: 7 Best Shopify CSS Editor Apps
Are you looking for one of the best Shopify CSS editor apps? Then above are 7 of the best options for your website. Which of these will you choose?
