Pronto - San Diego, developed by San Diego Metropolitan Transit System, is a full version iPhone application that simplifies your public transit experience. With Pronto, buying fares for MTS and NCTD has never been easier. The app allows you to add money to your account, plan trips, see real-time arrivals, get service statuses, save favorite stations, and find stops for San Diego County area transit so you can plan your trip around San Diego without any problems.

One of the unique features of Pronto is the pay-as-you-go function that ensures you always get the best fare. You can add money to your account with a credit or debit card, and every time you scan your app, the appropriate one-way fare is deducted from your balance. The app also allows you to track your progress toward a Day or Month Pass, and you will never be charged more than a Day Pass ($6 Adult or $3 Reduced Fare) in a given calendar day, regardless of how many trips you make.