multiple worker/web processes on a single heroku app

All processes must have unique names. Additionally, the names web and worker are insignificant and carry no special meaning. The only process that carries a significant name is the web process, as stated in the Heroku docs:

The web process type is special as it’s the only process type that
will receive HTTP traffic from Heroku’s routers. Other process types
can be named arbitrarily. — (

So you want a Procfile like so:

capture: node capture.js
process: node process.js
purge: node purge.js
api: node api.js
web: node web.js

You can then scale each process separately:

$ heroku ps:scale purge=4

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