The Skyfire 2.0 app acts as an Internet browser that plays Flash videos on Apple devices, e-Week reported.
Skyfire said on its blog that the app met with "unbelievable enthusiasm." The company is now "effectively sold out and will temporarily not accept new purchases through the App store."
"Despite our best attempts and predictions, the demand far exceeds our initial projections," Skyfire said on the blog. "We are working really hard to increase capacity and will be accepting new purchases from the App Store as soon as we can support it."