Yes, it's because they pro-rate add-ons by the second. If you sign up with Heroku, you immediately get 500 concurrencies as part of the free plan. Signing up di

Yes, it's because they pro-rate add-ons by the second. If you sign up with Heroku, you immediately get 500 concurrencies as part of the free plan. Signing up directly with blitz.io, OTOH, gives you blogging and referral credits - see http://blitz.io/invite http://blitz.io/invite