A dyno or two should be able to handle a boatload of traffic for a well-designed "typical" web app. See http://docs.heroku.com/dynos#dyno-concurrency-and-scalin

A dyno or two should be able to handle a boatload of traffic for a well-designed "typical" web app. See http://docs.heroku.com/dynos#dyno-concurrency-and-scaling http://docs.heroku.com/dynos#dyno-concurrency-and-scaling for their performance claims (10-100 req per sec). Remember that with proper caching the number of reqs that actually hit a dyno may be a lot less than the number incoming (with Heroku you get a Varnish cache for free). Unless your app gets truly impressively large traffic, or your app is so trivial that you have plenty of spare time for sysadmin tasks, Heroku is quite reasonably priced.