BASH/Linux: Always Up or Retry a command?

For my particular use case, I liked to use docker-compose up to provide retry logic for a couple of apps. When shifting gears and pivoting to easy to use CDN infrastructure, it seems as if running shell commands to start everything up in a single docker container will be simpler. However, the only thing I have found that corresponds to anything like "always up" logic is:

while true; do start-app || sleep 1; done

What I was curious about was if there is truly some sort of Unix/BASH 'retry' tool that will make sure a command is always running in addition to whatever the useful features there are for that kind of system-level operation?