The initial release of Taiyaki Talky!
Note: This web application only works in Chrome and Safari at the time of release. This is not for lack of trying—Firefox just hasn't implemented the speech-to-text half of the Web Speech API.
The download (taiyaki-talky.com) below is an Actually Portable Executable that will run on Windows, macOS, Linux, and various flavors of BSD. On macOS specifically, you may need to run it from your terminal.
Once you have run the executable once, you can add the Progressive Web App to your browser, and it should stay available even without running the executable again. Please open an issue if this doesn't work for you.