No-Code is a category that is difficult to define. There's the clear no-code tools like Bubble, which the entire purpose of them are for building apps without directly needing to know how to code.
But ultimately what makes an app able to be a "no-code" builder is that it needs to have powerful relational database functionality. So it stands that many of the apps listed in the database comparison page also have a hint of no-code to them.
With Airtable and Zapier both investing resources into an "interface builder" component alongside their respective database products, and automation/integration capabilities is clear territory for no-code.
For example, we've built entire product MVP's using Airtable as the foundation and Zapier/Make as the connective tissue between the other tools required. For example we have the product Communicate by Efficient App, which is entirely a no-code product.
It uses Airtable as the programmable settings area for email copy/merge fields/delay settings and more, Postmark for handling the transactional email sending component, Copper as the main interface that the customer is interacting with the tool in on the day-to-day, and Zapier to tie together all of the complex logic.
As you'll see in the above example, it's really 4 different tools coming together to ultimately make the "product", but each of those in their own right has no-code capabilities by leveraging an integration tool like Zapier/Make.
So all of that to say, take a grain of salt when looking at these apps below. While they may not directly be a no-code builder standalone, they contain most of the components that are required of a tool to be used to build apps within.