Fender Tune - Free guitar and bass tune iOS app
Google Payment API - Enable an easy-to-use checkout experience for customers
Tuner Eclipse - A simple and accurate guitar tuner for iOS
Giftbit Payment API - Stripe for gift cards
Epoch - Simple, with easy all-inclusive merchant integration. Powerful, with automated international customization. Flexible, for the most unique and sophisticated demands.
ACH payments with Stripe - Accept bank payments with a few lines of code.