Vocal Lab is described as 'helps you train to sing on key. It listens while you sing and displays the pitch of your voice on a graph, in real time. All you have to do is watch the graph while you sing and try to stay near the lines' and is an app in the Education & Reference category. There are four alternatives to Vocal Lab for a variety of platforms, including Mac, Windows, Online / Web-based, PortableApps.com and iPad. The best alternative is EarMaster, which is free. Other great apps like Vocal Lab are GNU Solfege (Free, Open Source), Meludia (Freemium) and Better Ears (Paid).
Professional software for ear training and practical music theory on Windows and Mac. A program such as EarMaster will provide you with: Progressive lessons made by music teachers that help you build up your skills according to your actual level.
GNU Solfege is free music education software. Use it to train your rhythm, interval, scale and chord skills. GNU Solfege is an ear training program written to help you train intervals, chords, scales and rhythms.