Google Mobile-Friendly Test is a search engine optimization software solution offered by Google.
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GTmetrix
Score 9.9 out of 10
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Gtmetrix is an analytics tool focused on determining website performance with features like page load speed details, video capture, and the ability to test from multiple regions around the world.
The competition does not specifically analyze mobile-friendliness or responsiveness, just overall desktop performance. It is vital to know if a website passes Google's Mobile-Friendly requirements in order to better your search rankings and search traffic.
It is a single-use tool: it tests mobile usability of a website or code snippet. This is useful before, during, and after the development process. So, if you are developing a website, then the mobile-friendliness tool is a necessity. Its also useful (in conjunction with Page Speed Insights and Search Console) in developing a full idea of site performance and how it relates to SEO.
GTmetrix is very well suited for small organizations or startups that do not have sufficient technical staff for site optimization. GTmetrix also comes with the free version, which allows users to use their service for free for up to three websites, which is a good option. However, this might not be the best option for a large organization that works in different technical domains and have a good number of technical staff.
Google does not cross-check the results from other search engines in the creation of the tool. Bing and Yahoo might not consider your website mobile-friendly, even if Google does.
Some devices and screen resolutions were not thought of when Google created the tool.
The output of the tool is not specific enough, at times, for web developers.
They might consider improving their checking process speed, it often takes a huge time to display the performance report. This is even longer for non-logged-in users.
Previously two different options of Google's Pagespeeds and Yahoo's lighthouse were shown in the report section, now only combined report is shown. I personally like the two reports from different sources.
Non-tech savvy persons might not find it so easy to use.
I have never had the need to use GTmetrix support. Therefore, there is really no way for me to give a grade here. However, if you are on a paid plan my guess and it is a guess, is that their support is as good as the tool is. There are a lot more features in the paid plans, reporting. monitoring etc. I could see where support could come into play as these features are added to the account
The Google Mobile-Friendly Test is much better than Bing Webmaster Tools to ensure our clients' websites are mobile friendly responsive. Google's tool is created specifically for most of the online searches from the internet, and most modern devices, modern browsers, and screen resolution settings. Bing is not as technically advanced as Google and not as specific in their tools, to ensure the creation of mobile-friendly responsive devices.
Given we are doing the work to improve in Google to a large degree - the Google product is essential. But GTMetrix may use their info as well as other independent stuff to be a little better. I appreciate the way GTMetrix provides the info - cleaner and clearer and thus quicker to address.