I've been using my own version, completely terminal-based, for more than a year now and it has changed my life. I'm a lot like your wife; other systems haven't worked for me. This does, because I do look at all my SMS messages every day and dismiss them. Todoist's alerts just didn't do the job, and other systems didn't either.
I almost certainly would have had a product out in this area months ago but my attention has been going to crypto-related projects! I have the start of a Django-based UI nudge-like product now. I've been working on it in the background, partly in case none of my crypto stuff works out, and partly just to learn web UI development.
I'm not sure where my project will go now that yours is out, but congratulations on getting it out there, and good luck! (Now I'm thinking I might just open source my terminal version, and drop the django one. Techies could use the terminal version by getting their own twilio accounts...)