Universal Data Generator is described as 'UDG creates realistic test data directly in your Salesforce sandbox or scratch org via an easy to use web interface. Native record relationships, picklist values, and record types' and is an app in the development category. There are 2 alternatives to Universal Data Generator for Web-based. The best Universal Data Generator alternative is Smock-it tool, which is free.
Smock-it(also known as Smockit) is a tool for generating test data for Salesforce quickly and accurately through CLI. Built by Concretio, it goes beyond traditional tools and can be an alternative to tools like Mockaroo and Snowfakery.
It's hard to put together a meaningful UI prototype without making real requests to an API. By making real requests, you'll uncover problems with application flow, timing, and API design early, improving the quality of both the user experience and API.
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