Syllable includes support for the x-callback-url style URL scheme. Available actions are addText and addURL, as shown below.
Here is an example for addText:
syllable://x-callback-url/addText?text=insertYourTextHere
And an example for addURL:
syllable://x-callback-url/addURL?URL=insertYourURLHere
You can also install them directly into Launch Center Pro by finding it in the app directory within the app, or clicking on the corresponding link below: