I’ll start off by saying that I’m the CEO of Squidler so that there is no question about my intentions. That being said - I sincerley think Squidler.io is a good and price effective solution for checking accessibility for Shopify stores.
Squidler performs continuous and fully autonomous testing of websites. All you have to do is provide an URL and Squidler checks for functional problems, accessibility issues, language and spelling mistakes and more.
How it works is that it opens your website in an actual browser, and navigates and interacts with it much like a human would. While surfing the website it evaluates against a number of rules, including all of axe-core which check WCAG 2.3 et al. Since we load the website and navigate it in a browser even dynamically loaded content will be check against it.
You can subscribe to Squidler.io for €49 and your website will be tested every day in different ways and interactions. Each test can obviously not be complete, so the way it works is that it navigates and testing over time with a level of informed randomness. During these tests it also checks spelling and grammar with LanguageTool and a number of functional and usability issues like code in content, unintentional side scroll, crashes, dead ends, dead links and much more.
When a problem is found you will receive an email (or you can configure so you get a slack notification) and a link to a video-like step by step walkthrough of how and where the problem was found.
On Squidler.io you can do a short, initial test run, and if you want to see problem details for that short test you can sign up without providing any card details.
Sorry for the long pitch, but I genuinely think we can help. Please ping me if you have any further questions! /Mattias Ask