Apps similar to Universal Data Generator include Smock-it tool, which is free. Other options are Mockaroo. Between them they cover the web.
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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