SQL is a lot easier to work with than you would think. So is PHP. I stalled for a long time on learning PHP because “It was too hard”, but actually it’s pretty straightforward once you learn how to search through the documentation and use Google.
Most of the articles about web-based voice interfaces are from five years ago. I think it might be one of those things that hasn’t been touched much because people don’t realize how far it has come. It also can be a little bit of a challenge because the client browser and operating system play a major role in the user’s experience.
I also have a hardware solution in development that helps guarantee a consistant expereince.