Comment by DisruptiveDave

Ton of examples of this stuff from the last 6 or 7 years, some onsite and some standalone, including:

- Hubspot's website grader: https://website.grader.com/

- Leadpages' landing page grader: https://www.leadpages.net/landing-page-grader

- Grammarly's plagiarism checker: https://www.grammarly.com/plagiarism-checker

- Coschedule's headline analyzer: https://coschedule.com/headline-analyzer

- UserTesting's "Peek": https://peek.usertesting.com/

- Berklee's online guitar tuner: https://online.berklee.edu/guitar-tuner