The iPad 4 is available at $399 for the 16GB Wi-Fi model and $529 for the 16GB Wi-Fi + cellular model at the four major U.S. carriers - AT&T Inc, Sprint Corp, T-Mobile US Inc and Verizon Communications Inc.
The fourth-generation iPad, which has a 9.7-inch Retina display and supports 4G carriers worldwide, was launched in 2012, while the iPad 2 was launched in 2011.
Apple Inc. discontinued the iPad 4 last year when it launched its current flagship tablet, the iPad Air. The company had cut the price of iPad 2 to $399 in 2012.
Also read: The Indian Express Most Powerful Indians
Tablets based on Apple's iOS platform held 36 percent share of the market in 2013, trailing those based on Google Inc's Android software that had 62 percent share, according to research firm Gartner.
Apple Inc. also launched on Tuesday an 8GB iPhone 5C priced at 429 pounds ($710), 40 pounds cheaper than the 16GB version, according to the company's UK website.
The 8GB iPhone 5C will also be available in France and Germany.
"We believe this newly configured device will have a lower gross margin as we estimate the difference in cost to Apple for the 8GB of NAND is $5 to $10," Cross Research analyst Shannon Cross wrote in a research note.
Analysts have said earlier that the iPhone 5C, which is about $100 cheaper than the iPhone 5S, was unable to grab market share from rivals offering lower-cost phones based on Android.
Apple Inc.'s shares were up 0.5 percent at $529.60 in noon trading on Tuesday on the Nasdaq.