Reference
Reference
Hard numbers and fixes — platform limits, common deployment errors and their causes, and answers to the questions we are asked most.
The lookup section. Nothing here teaches a workflow; it answers "what is the number" and "why did that fail".
In this section
Limits
Apps, memory, storage, build time and request size.
Troubleshooting
Build failures, crash loops, port and domain problems.
FAQ
Billing, regions, runtimes, databases and domains.
Start here instead
If your app has never deployed successfully, the fastest path is the
quickstart, then
builds and frameworks — most first-deploy
failures are a build command or a $PORT binding, not a platform limit.