AMPBench - AMP ⚡ Validator
AMPBench ⚡

This is not an official Google product.
Note: ampbench.appspot.com (this website) will be shut down on 31 January 2020. For more information, alternatives, and to provide feedback, please see GitHub Issue #126.
Click to learn more about the open source AMP HTML ⚡ Validator on GitHub
Click to learn more about AMP HTML ⚡ on AMP by Example