How do you know if a site uses a custom engine

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Some sites do not use standard CMS, preferring their own developments. Here are the signs that may indicate this:
Missing keywords in code. No wp-content or other CMS tags found.
Individual design and functionality. If the site has unique interfaces and modules, it can be created "from scratch".
Unusual server headers. HTTP headers indicate rare or unknown technologies.
What to do?
Try requesting additional data through domain analysis tools (eg Netcraft).
Explore JavaScript files to find clues about the library or framework.
website engine
Practical tips for process optimization
To make the analysis canada phone number list of someone else's site take a minimum of time, it is important to organize the process. Here are some recommendations:
Create a checklist for analysis.
Your checklist might look like this:
Check using an online service (WhatCMS, Wappalyzer).
Analyze the source code of the page.
Examine HTTP headers.
Use professional tools for complex cases.
Store information about frequently used engines.
If you work with several competitors, keep a database of what CMS they use. This will reduce the time spent on re-analysis.
Automate the process.
Use APIs from services like BuiltWith to collect site data automatically.
website engine
Conclusion
Determining the engine of someone else's website is not only a way to learn more about your competitors, but also the key to choosing the best solution for your business.