Ask yourself the following 4 questions:

1. Is it valuable? (How/why?)

2. Is it rare?

3. Is it easy for others to imitate it?

4. How are you going to exploit your idea in such a way that you can have a competitive advantage over your competition?

Also though, fifth bonus question, if you spend time working on this idea, is that an opportunity wasted for you to spend that time pursuing a better idea? Just because it is going to be technologically straightforward and not too time consuming doesn’t mean it’s a good way to spend your time if you could spend your time doing something better.