(Full disclosure: Rev.ai engaged me to prepare a competitive internal review to see how their API stacked up against many other [much larger] vendors. The results surprised me as a coder - so surprised that I asked, and was granted, their kind permission to publish this for my readers.)
So you need to convert some speech to text and you don't have time to go try to code every API out there. Where should you start? Well, lets start with the impressions I got when I surveyed all the major API publishers (AWS, gcloud, IBM, Microsoft, Rev.ai) in speech-to-text.
Broad Market Overview
The first sense one gets as one begins to examine text-to-speech APIs on the big clouds, is the feeling that the big vendors want to try to lock you in to their cloud/platform in order to use their speech-to-text API. AWS is particularly 'bad' in this sense as endpoints and API keys that actually work are very hard to find. Microsoft's endpoints and API key were easy enough to find, but they only allow 10 seconds of audio via API (you have to use their platform tools for longer sound files). If your project is already committed to a given cloud platform, by all means you should check that API solution out first (but a few are poorly documented so you may have trouble anyway).
There was surprising response to the last post - even though I simply mentioned in passing that many GOP organizations already have the capability to track member and donor recruitment online, but many are not using it. Nationbuilder already has it - part of the following video looks at options for adding it to your Wordpress site.