How much does it cost to use VerticalResponse for AppExchange?

VerticalResponse for AppExchange is free to download and install. There are no monthly fees or contracts involved when using our application. Our pricing follows a credit based, Pay As You Go model. Purchase credits when you’re ready to send your email or buy in bulk at a discounted rate. Click the following for pricing details - http://www.verticalresponse.com/salesforce/pricing/