Google Cloud Platform is described as 'Google Cloud platform enables you to build and host web apps on the same systems that power Google applications. App Engine offers fast development and deployment; simple administration, with no need to worry about the underlying infrastructure and systems, patches or backups' and is a Cloud Computing service in the online services category. There are more than 50 alternatives to Google Cloud Platform, not only websites but also apps for a variety of platforms, including Windows, Linux, SaaS and Self-Hosted apps. The best Google Cloud Platform alternative is DigitalOcean. It's not free, so if you're looking for a free alternative, you could try OpenStack or Amazon Web Services. Other great sites and apps similar to Google Cloud Platform are Linode, Microsoft Azure, Amazon Elastic Compute Cloud and PythonAnywhere.
One is a Web Service and the other is a Dev environment for python.