It makes sense to periodically check your website is mobile-friendly.
A big reason is that search engines favour websites with mobile-friendly pages.
Bulk Mobile Friendly Test by Experte
The Experte Bulk Mobile Friendly Test enables checking that each one of your website's pages are optimized for mobile devices.
Instead of just checking one URL, the tool crawls your entire website, assessing up to 500 pages at one time.
Note: crawling is limited to 60 seconds and 500 URLs.
How reliable is the tool?
The developer reports that the test uses the same data as Google's well-known Mobile Friendly Test.
The images below illustrate testing of the pages in a website with just one URL.
Enter the URL of your website (its domain name with HTTPS:// prefix).
View results, and click any button stating Needs Improvement.
Read action points for improving mobile friendliness of the relevant page.
You can try using the tool at the link below.
More useful free tools
The following really useful testing tools are also offered by Experte via their website:
WYNCHCO Joomla! CMS Support
We coach, help and support managers with responsibility for Joomla! websites in organisations across Cheshire, Manchester, Merseyside, North West England & the UK.