IsItWP VS WP-Optimize

• Ease of Use
  IsItWP provides a user-friendly interface that makes it simple for users to check whether a site uses WordPress, making it accessible even for those with limited technical knowledge.
• Comprehensive Information
  The tool offers detailed insights into the WordPress themes and plugins used by a website, which can be beneficial for developers and designers seeking inspiration or competitive analysis.
• Free Service
  IsItWP is available at no cost, providing users with valuable website analysis without any financial commitment.
• Quick Results
  The tool delivers fast results, enabling users to quickly determine if a site is using WordPress and gather other relevant details.

Possible disadvantages

• Limited to WordPress
  IsItWP is specifically tailored for WordPress detection, which means it does not provide insights for websites built on other content management systems.
• Potential Inaccuracies
  In some instances, the tool may not accurately detect WordPress usage if the website employs strong obfuscation techniques or custom configurations.
• Reduced Functionality
  Compared to more comprehensive website analysis tools, IsItWP focuses primarily on CMS detection, lacking more extensive performance or SEO analysis features.
• Advertisement Presence
  As a free tool, IsItWP includes ads, which might distract some users or interfere with their overall experience using the site.

• Database Optimization
  WP-Optimize provides robust tools for cleaning up and optimizing the WordPress database by removing unnecessary data such as post revisions, spam comments, and expired transients, which can improve overall site performance.
• Cache Management
  The plugin includes caching features that help to speed up the website by storing static versions of dynamic pages, thereby reducing server load and improving load times for users.
• Image Compression
  WP-Optimize offers image compression capabilities that can automatically compress images upon upload, reducing file sizes without noticeable loss of quality, which helps in improving site speed.
• Easy to Use Interface
  It provides a user-friendly interface that allows even non-technical users to easily navigate, configure settings, and perform optimization tasks without needing deep technical knowledge.
• Scheduled Cleanup
  Users can set up automated optimization schedules for regular clean-ups, reducing the need for manual intervention and ensuring that the site maintains optimal performance over time.

Possible disadvantages

• Potential Data Loss
  If not configured correctly, the database optimization features can result in accidental deletion of important data, such as post revisions or draft posts.
• Limited Free Features
  The free version of WP-Optimize offers only basic functionalities, and more advanced features like multisite support and certain premium optimizations are locked behind a paywall.
• Compatibility Issues
  There could be compatibility issues with some themes and plugins, potentially leading to site errors or conflicts that could require technical troubleshooting.
• Performance Overhead
  Although designed to optimize performance, running too many optimization tasks or settings can sometimes lead to increased server load, ironically slowing down the website.
• Limited Support
  Users of the free version may find support limited, as dedicated customer support is typically reserved for premium users, making it challenging to resolve issues promptly.

• How to know if a website is using a website build service or if it is made from scratch? Is there a way?

  Https://whatcms.org/ if it's WordPress you can then use https://isitwp.com to find general things like theme or plugins. Source: almost 4 years ago

Tracking WP-Optimize since Mar 2021.