Open Sunny on your iPad, iPhone, or iPod touch, and you’re instantly transported to your own private beach, thanks to stereoscopic 3D audio and beautiful parallax illustrations.

Install Receiptmate on your iPhone and the need to fuss with physical receipts will become a thing of the past, thanks to smart organisation tools and Evernote integration.

Josef Albers’s iconic book, “Interaction of Color,” has been given a modern makeover as an iPad app to celebrate the 50th anniversary of its first publication. This absorbing and educational work — referred to as a “landmark in the field of color philosophy” by the director of Yale University Press — comes to life on iPad, with previously impossible interactions adding a new dimension. Be sure to watch the promotional video for a glimpse into the thinking applied to both the original book and this new app.

Over at Wired, Mat Honan details the challenges Twitter security engineers faced in designing a new two-factor authentication system that is both more secure than any existing solution and easier for users to understand. It’s a fascinating read, and gives great insight into how much thought goes into maintaining the security of the Internet-based services we use every day.

Load Thunderspace on your iPhone, iPad, or iPod touch, and you’ll be transported into the acoustic center of a thunderstorm, thanks to Emmy award-winning recordist Gordon Hempton.

Musician Chris Armstrong takes a look at how you can use an iPad and the Audiobus app to join multiple music apps together, something that’s generally not possible in iOS, and he offers recommendations for some of the best Audiobus-savvy music apps for the iPad.

Preparing for a trip to Spain, Chris Armstrong has equipped himself with the Duolingo Web and iPhone apps to brush up on his Spanish. But is it effective?