ClearSpeller: a free tool for spelling out complex text strings

I often find myself sharing confirmation codes and spelling things like email addresses over the phone. I never committed the NATO alphabet to memory, so I built a simple tool to convert the text to easily recognizable words to reduce repetition, mistakes, and awkward pauses grasping for the right word to convey meaning. I built it as a Chrome Extension and also as a webpage.

I'd love your feedback. Aside from jsut being my household tech support for the family, I think Customer Service and Tech Support reps will find it useful.