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This is a very simple dashboard widget that will load every time your dashboard loads. It will submit your feed to an online feed validator, grab the response and update your dashboard with the results.
It’s best to know immediately that your RSS feed is invalid. Sites such as Bloglovin’ and Google Reader will not add your posts to their sites if your RSS feed is invalid. Knowing there is an issue is the first step in resolving the issue!
Most invalid RSS feeds are caused by some html you’ve used in your post. This widget is not intended to fix your feed, it is just a notification that there may be an issue with your feed.
This plugin requires cURL to work. cURL is a php library that allows HTTP requests to be sent. This is a core feature of the plugin. The good news is, most online hosting providers have cURL setup and installed for you already. If you install this and the widget displays an error of some sort, you probably have an issue with cURL.
Homepage for the RSS Feed Validator is: http://www.thenerdnest.com/rss-feed-checker

RSS Feed Checker

This widget will submit your wordpress RSS feed to feedvalidator.org, and check the results to verify your feed is valid.

Rocket Validator

This plugin displays the most recent site-wide accessibility and HTML validation report for your website, retrieved from your connected Rocket Validator account and displayed within your WordPress admin interface.
Rocket Validator is a Software as a Service (SaaS) solution used by organizations, web agencies, and developers across the globe to streamline the validation process for large websites.
The automated web crawler scans your site and checks the internal web pages to automatically identify accessibility and HTML issues, producing a summary report with the main issues found.
The free version of Rocket Validator includes 100 free checks per month and allows users to check up to 25 web pages per site for HTML issues. Upgrading to a Pro account unlocks a range of advanced features, including reports with 5,000 web pages per site, A11Y and HTML checks powered by Axe Core and W3C HTML Validator Nu, and scheduling, deploy hooks, muting rules, device viewport emulation, and guest accounts. Pro accounts are entitled to perform up to 50,000 monthly checks.
<h4>Note about automated testing</h4>
This site validation report details the issues identified by automated testing with Axe Core and W3C HTML Validator. It is essential to recognise that automated testing represents only one aspect of the overall validation process. No automated tool can provide absolute assurance that your web pages are free from issues.
The absence of issues identified by Rocket Validator does not guarantee that a site is entirely free from issues. It is also advisable to perform manual testing on a range of devices and browsers.
<h4>Note about external service integration</h4>
This plugin uses the Rocket Validator API to retrieve the site validation report from your Rocket Validator account.
You must have a Rocket Validator account to use this plugin. Sign up for a free account and get 100 free monthly HTML checks and 25 pages per report. Or, subscribe to a paid plan to get all the features, including Axe Core checks, scheduling, muting, device viewport emulation, and more.
Once you have an account, you can create an API token to connect your Rocket Validator account to your WordPress site. This plugin uses the API token to authenticate on the Rocket Validator API and retrieve the latest site validation report from your Rocket Validator account.
Sign up: <a href="https://rocketvalidator.com/registration/new" rel="nofollow ugc">https://rocketvalidator.com/registration/new</a> 
Pricing: <a href="https://rocketvalidator.com/pricing" rel="nofollow ugc">https://rocketvalidator.com/pricing</a> 
Terms of service: <a href="https://rocketvalidator.com/terms" rel="nofollow ugc">https://rocketvalidator.com/terms</a> 
Documentation: <a href="https://docs.rocketvalidator.com" rel="nofollow ugc">https://docs.rocketvalidator.com</a>
<h4>Installation</h4>
All you need to connect to your Rocket Validator account is an API token which you can get after you sign up for a free Rocket Validator account.
<ol>
<li>Install the Rocket Validator Accessibility Dashboard plugin.</li>
<li>Sign up for free Rocket Validator account at <a href="https://rocketvalidator.com/registration/new" rel="nofollow ugc">https://rocketvalidator.com/registration/new</a></li>
<li>Run your first report for your site at <a href="https://rocketvalidator.com/s/new" rel="nofollow ugc">https://rocketvalidator.com/s/new</a></li>
<li>Create a read-only API token at <a href="https://rocketvalidator.com/api/tokens/new" rel="nofollow ugc">https://rocketvalidator.com/api/tokens/new</a></li>
<li>Go to the WP plugin settings and enter your API token. Also double check the site URL for the report matches the one for your site.</li>
<li>All set up! Go to the main page of the Rocket Validator Accessibility Dashboard to see your report.</li>
</ol>

Rocket Validator Accessibility Dashboard

Connect your Rocket Validator account to show the latest site-wide accessibility & HTML validation report for your site.

RSS Feed Checker vs Rocket Validator Accessibility Dashboard