This is a really great way to finally learn the fretboard - something we all want to do, but are too busy to make the effort. Frets-101G will make the learning curve more fun and the challenge much easier. How much better would your riffs sound if you instantly knew where the base notes were in any key? I'd guess your audience would be much impressed. Give this a try and you'll get to that next level much quicker.
Simple, but helpful for learning the fretboard. It's nice that the free version lets you learn all the frets and strings. The upgrade looks interesting, but might be more than a beginner needs.