Groupon is a service that offers it's users to purchase coupons for services and goods. In turn, coupons guarantee discounts up to 70%. The service itself is a mediator that promotes businesses.

You can't give the exact amount until and unless you know about nature of app. But the approximate cost of creating a basic E-Commerce Mobile App like Groupon is differ from $2500 to $16500 depending on functionality and platforms.

Groupon gives users an opportunity to save some money. With it's help, consumers are able to pay less for services and goods but under the condition they have bought a discount through this service.