Finally, Starbucks in Singapore has an iPhone app that allows you to top up the card. It has been a frustration for me since I have to top up the card at the store when it runs low. Many times, I have let others behind me waiting impatiently while I top up the card.
With this card, you can easily see rewards and the amount in the cards. The maximum top-up option is S$300. Of course, I think you can reload many times and you can add more than one card in this app. I have only 1 complain. The topping up of the card is via VISA or Mastercard. It is troublesome to key in the card details. I wish they have PayPal as an alternative option.
One strange thing that I observed is that if you visit the Starbucks website, you are NOT able to top up the card. I hope it is a temporary problem since not everyone has an iPhone.
BTW, if you search for Starbucks App in the App Store, make sure that you choose the correct one. There are many apps related to Starbucks. Please check for Starbucks Singapore and publisher is Starbucks Coffee Company. Hoping to see an Android version and Windows Phone version soon.