Hi,
Have Done clarion apps with dragon dictate. Dragon dictate will do voice to text in almost any text field. Some versions of Dragon dictate will accept stored voice files - I have never played with this but it is theoretically possible to store the voice in a blob and then submit it to Dragon.
That being said, Dragon dictate should work with a net talk app. It would have to be installed on the end user's computer. Besides being able to program system commands into Dragon ( to run the browser or computer), the end user would be able to do voice to text within any text field (including entry strings) in a browser running a net talk app. Built in voice recognition in Windows 8/10 machines has gotten much better but I would think that Dragon with a dedicated mic would be best. For many applications, CONTEXT makes voice to text accuracy better.
FWIW,
Ron Jolda