Amazon Web Services vs Skytap

Amazon Web Services
Access a reliable, on-demand infrastructure to power your applications, from hosted internal applications to SaaS offerings. Scale to meet your application demands, whether one server or a large cluster. Leverage scalable database solutions. Utilize cost-effective solutions for storing and retrieving any amount of data, any time, anywhere. Amazon Web Services free tier has no alternatives.
Skytap provides Environments as a Service to the enterprise. Skytap Environments as a Service remove the biggest constraints slowing development teams down. Our solution removes the inefficiencies and constraints that companies have within the software development lifecycle.
Face to face in the news:

2017 - AWS introduced per-second billing for EC2 instances. Your move, Skytap !

Over the last few years, some alternative cloud platforms moved to more flexible billing models (mostly per-minute billing) and now AWS is one-upping many of them by moving to per-second billing for its Linux-based EC2 instances. This new per-second billing model will apply to on-demand, reserved and spot instances, as well as provisioned storage for EBS volumes. Amazon EMR and AWS Batch are also moving to this per-second model. it’s worth noting, though, that there is a one-minute minimum charge per instance and that this doesn’t apply to machines that run Windows or some of the Linux distributions that have their own separate hourly charges.

2014 - Skytap gets $35M for its cloud development environment to take on Amazon Web Services

Skytap, the service that aims to help enterprise development and test teams work more efficiently (and test their code more often), announced that it has raised a $35 million funding round led by Insight Venture Partners. With Skytap, enterprises can re-create their production environments in the cloud to more effectively test their applications before they go live. The company says it will use the new funding to “fuel new levels of product innovation for enterprise-ready development and test environments,” and to expand its go-to-market capacity and bring more partners on board. Skytap was originally called Illumita and previously raised $29.5 million.