If you need to keep costs down for your web applications take a look at AWS lightsail.
https://aws.amazon.com/lightsail/
Lightsail pricing can be found here:
https://aws.amazon.com/lightsail/pricing/
And as your user base grows, as of today you can upgrade to an AWS EC2 instance at any time.
https://aws.amazon.com/about-aws/wha...e-path-to-ec2/
