Here are the latest iPhone/iPod touch/iPod/iPad apps. You can find ’em at the Apple App Store (http://www.itunes.com/appstore/).

Sinusoid has announced AKLite 1.0 for the iPhone and iPad, a real time spectrum analyzer for audio. The free app is used to calculate the frequencies in the Spectrum Analyser and displayed in real time. The frequency is displayed in either logarithmic or linear scale and this is selectable. The FFT length used in AKLite is 2048; interpolation gives resolution to within 1Hz.

Mac Dev Studio has released Scales HD 1.0 for iPhone, and iPod touch devices. This US$2.99 virtual measuring application offers on-the-go professionals a flexible scaling resource. Scales HD includes all of the most widely used industry standard architectural and engineering scales, as well as practical field tools with multi-use options.

CobbySoft Media has introduced Thermal Vision 1.0 for iOS. It’s a $0.99 app designed to interpret the luminance of the object and build an image with thermography effect. Traditional image processing technology is slow and demanding for the iPhone hardware. Thermal Vision is designed to overcome this by leveraging the latest OpenGL framework and applying post-processing pixel-shader to each frame of the camera feed and redisplaying the result on the screen using the built-in GPU.

Wattanasoft has launched “Immersive Spanish — Learn and Study” for iOS devices. The $4.99 app provides the user with a multimedia learning experience by associating pictures with spoken words and sentences. The app works by teaching the user vocabulary words and then building off of those words to form complete sentences. It teaches the user how to pronounce each word correctly by providing the phonetic translation of every word.

Dingo Games has unveiled Tasty Planet HD 1.0 for the iPad. In the $2.99 app, players control a tiny ball of grey goo which eats everything smaller than itself. As players make their way through the game’s 60 levels, the goo grows from a bacteria eating microbe to a planet gobbling monster. The more it eats, the bigger it gets.

RoJaSoft has debuted proSchool Free 1.0, the free version of their school calendar app for iOS. Developed specifically for students, proSchool Free keeps track of all their homework, tests, grades, subjects, schedules, and more. The free version has the same features as the full version. It is possible to create a one week schedule or a two week schedule. For adding a homework entry users just have to tap on a schedule item and select the assignment.

Indie developer Matthijs Hollemans has updated Reverse Chord Finder Pro, his musician’s utility for the iPhone and iPod touch to version 2.0.4. It’s an inverse chord dictionary that lets songwriters, composers, musicians and music students match chord names to the notes they’re playing. It lets the user select notes on piano, guitar or musical staff notation and then displays the names of the chords that correspond to those notes. It’s a way to discover new chords.

Apt Infowas has released iWallet 2.0, the second major release to the $4.99 money management tool for the iPhone, iPod touch and iPad. The new version comes with a new in-depth spending analysis tool and a new search tool.