Heroku limitations

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1. Can only use supported runtimes and versions (e.g. python-3.6.2 or python 2.7.13)
2. Can only use supported system and software libraries
3. Can only run web services (data stores and other services available only via paid add-ons)
4. Apps can't access the shell
5. Devs can't access servers via ssh
6; Local disk is read-only
7. Load balancing is HTTP/HTTPS only
8. Requests are limited to 30 seconds.
9. Limited to one AWS region
10. App must boot in 60 seconds or less
11. Apps can be at most 100MB
12. Build must take less than 15 min
13. Logs are limited to 1500 lines unless you use supported (paid) add-ons
14. Manual scaling only
15. Pricing gets very steep as you scale up


Source:
1. https://www.youtube.com/watch?v=LVgP63BkhKQ

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