If there are plenty of tools which do this (and you're right, I think there are), but there are still a lot of people who want them but aren't using them, then

If there are plenty of tools which do this (and you're right, I think there are), but there are still a lot of people who want them but aren't using them, then the existing companies are missing something. It could be that the existing products don't work in quite the right way; sometimes small differences are important. Or it could be that the companies haven't figured out the right way to reach customers. When users tell you this, do you show them the existing products you know of? If your hypothesis is right that the space is saturated, then they should start using them right away. But I suspect that they won't, which means that there's more left to be done.