What is PaaS?

PaaS stands for Platform as a Service. It’s a category of cloud hosting where the platform handles all the infrastructure for you, so you can just push your code and it runs.

When developers build a web app, they need somewhere to run it on the internet. The traditional approach was to rent a raw server from a data center, then install the operating system, configure everything, and keep it all updated yourself. A PaaS platform sits on top of that and handles all of it. You just write the code and deploy.

The most well-known early example was Heroku, which launched around 2007 and made deployment incredibly simple. You’d run one command and your app was live. These days the category includes platforms like Render, Railway, and Fly.io. Each has its own pricing and tradeoffs, but the core idea is the same: push code, the platform figures out the rest.

PaaS is one tier in a stack of “as a Service” acronyms. IaaS (Infrastructure as a Service) is raw compute, storage, and networking with no managed layer on top, think AWS EC2 or bare metal. SaaS (Software as a Service) is a finished product you just log in and use, like Gmail or Notion. PaaS lives in the middle, giving you more control than SaaS but far less to manage than IaaS.

I’ve used PaaS platforms for most of my own projects and at early-stage startups. For most apps, especially anything where you want to ship fast, a PaaS is the right call. There’s a ceiling to how much you can tune before you need raw infrastructure, but most apps never hit it. For a more detailed comparison of the current options, see Where should I deploy my app?.