What do you call a computer program that allows users to sign up for a trial before making a purchase?

The term that describes a computer program allowing users to sign up for a trial before making a purchase is shareware. Shareware is a type of software distributed on a trial basis, with the idea that users can try it before deciding to buy the full version. This model encourages potential customers to experience the product's features and functionality, promoting user engagement and increasing the likelihood of a purchase once the trial period ends.

While freeware refers to software that is completely free to use without the intent of later purchasing, Software-as-a-Service (SaaS) refers to software that is hosted in the cloud and typically requires a subscription for ongoing use rather than a trial approach. Open source software involves software for which the source code is freely available and can be modified, often with no trial or purchase required in the traditional sense. These distinctions underscore why shareware is specifically suited to describe the scenario of trial software before purchase.