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7M hits/month is 2.6 hits/second. #justsaying

Also, how are 3 Heroku dynos less than $1/month? 2 non-free dynos are $40 right off the bat.

My bet is they are set up as three apps, in which case, you get 1 free dyno per app (all of them).

Sorry typo. 7M hits per day. It was tested with 250 concurrent users, and page load times consistently stayed below 300ms (measured end-to-end).

Andrew is right, we set up three different apps and so each is free.