In the detailed comparison chart, its says max number of process type is 10 (could have 10 dynos). It also says that hobby tier is not allowed horizontal scaling (meaning only 1 web dyno, no more web or worker dynos). From what I understand horizontal scaling means adding more web or/and worker processes.
It seems contradictory to me. I tried to go through its documentation, but still don't understand.
Simple Web Apps just serve webpages or API from the web process type.
Advanced Web Apps may have extra features, for e.g. a worker process (say, you've to send 1000 emails, so you put that task in a task queue, and the worker process handles it. So your main web process can respond quickly to the user), a scheduler process (to do cron stuff) etc.
In hobby tier on Heroku you can have 10 of these workers, however your main web process (which handles the webpages/API calls) will still be handled by a single, basic, dyno. A dyno is akin to 1 core of a processor (hardware). Now if you've a lot of load/visitors on your website, this might not be enough; you might want 4 dynos to be handling your web process alone. Well, that you can't do on the hobby tier.
