When comparing Wix and Squarespace in terms of customizability, both platforms offer robust tools for creating visually appealing websites, but they cater to different types of users and objectives. Here's a detailed breakdown:

Wix:

Customizability:

1. Template Flexibility:
2. Drag-and-Drop Editor: Wix provides an intuitive drag-and-drop editor allowing extensive customization. You can place elements such as text, images, buttons, and more virtually anywhere on your site without constraints.

3. Template Modification: Templates can be modified comprehensively. Once you've chosen a template, you can tweak almost every aspect, from layout to design elements.

4. Design Freedom:

5. No Coding Required: The platform is designed to allow users to customize their sites without any coding knowledge. Elements can be adjusted with ease, making it suitable for beginners.

6. Advanced CSS: For more advanced users, Wix allows the addition of custom CSS to further customize the site’s appearance.

7. Velo by Wix:

8. Developer Tools: For those with coding skills, Velo by Wix (formerly Corvid) provides powerful development tools to create custom web applications. This includes adding custom JavaScript and accessing backend APIs, enabling more complex site customizations.

9. Databases and Dynamic Pages: Velo allows integration of databases and the creation of dynamic content, making it possible to build sophisticated web applications.

10. App Market:

11. Third-Party Integrations: The Wix App Market offers numerous third-party apps and integrations to extend the functionality of your site (e.g., eCommerce tools, booking systems, marketing tools).

Squarespace:

Customizability:

1. Template Design:
2. Stylish Templates: Squarespace is known for its beautifully designed, professional templates that are aesthetically pleasing and optimized for various types of content.
3. Style Editor: The Style Editor within Squarespace provides substantial control over template design. You can adjust fonts, colors, page configurations, and other visual elements.

4. Responsive Designs: Squarespace templates are inherently responsive, ensuring a consistent, visually appealing experience across devices without additional customization.

5. Structured Customization:

6. Modular Design: Squarespace's customization is more structured compared to Wix. Elements are added in predefined sections, which can be limiting for some but also ensures design consistency and ease of use.

7. Limited Drag-and-Drop: While it also offers a drag-and-drop interface, it’s more grid-based, maintaining alignment and structure automatically, which increases ease of use but reduces flexibility.

8. Developer Platform:

9. Advanced Customization: For users with coding knowledge, Squarespace provides developer tools that allow access to underlying HTML, CSS, and JavaScript. This is ideal for users wanting to create a highly custom solution while leveraging the robust framework of Squarespace.

10. Code Injection: Squarespace allows code injection in the header, footer, and certain page areas for custom scripts and integrations.

11. Built-In Features:

12. Integrated Functionality: Squarespace often integrates advanced features within the core platform, meaning you might find less need for third-party integrations compared to Wix. These include blogging tools, eCommerce functionality, portfolios, analytics, and more.

Considerations and Limitations:

1. Ease of Use:
2. Wix: More suitable for users seeking a high degree of creative control with an easier learning curve for beginners due to its drag-and-drop capability.

3. Squarespace: Suits users who prefer a balance of customization with a structured design path. It might require a bit more time to understand the available customization options but usually results in more polished designs.

4. Performance and Maintenance:

5. Wix: The freedom to customize every aspect can sometimes lead to inconsistencies and require more frequent updates and maintenance.

6. Squarespace: The structured approach limits the potential for design inconsistency and reduces the need for continuous fine-tuning, providing more stability in the long run.

7. Pricing:

8. Both platforms have tiered pricing plans, but specifics can vary. Consider reviewing their pricing pages to understand what features come with each plan.

Conclusion:

• Wix is usually more customizable if you value design freedom and the ability to tweak your site extensively without much restriction. It’s ideal for users who want granular control and possibly build complex web applications.
• Squarespace offers a high level of customization too but in a more structured manner. It’s better suited for users who want beautifully designed websites with built-in functionalities and are okay with a bit more limited but still powerful customization options.

Ultimately, your choice will depend on your specific needs, the nature of your website, and your comfort level with web design and development tools.