> Looking for a SaaS idea? Ask random people in a target industry what kinds of things they do with Excel.

I understand where you're coming from, but this is just not good advice. Somebody (I can't remember if it was pg, Joel Spolsky, or someone else) once wrote an entire essay basically saying "DON'T make a startup that's just pivot tables. I have seen so many SaaS startups fail because they didn't realize they were just selling pivot tables at a much higher price than Microsoft wants for Excel."

Also take a look at this HN thread: https://news.ycombinator.com/item?id=12450802 where a whole bunch of people express bafflement of and loathing for people who unnecessarily replace Excel with half-baked software. It seems like a good idea; it's usually not.