Hey, Jason from Clarifai here. Reach out to us. I'd be interested in hearing more about your ideas, and how we might be able to support them. Fun fact: we're willing to give volume discounts based on number of concepts, inputs (indexed image search results), or predictions (tagged images).
Thanks for checking us out! Our demo may not fully represent what we have to offer, but you can see a sample response here with confidence numbers included (we call them probs):
https://developer.clarifai.com/guide/tag#tag
In terms of labels, our "general" model has over 11,000 labels, and we also have specialized models with labels tailored for other purposes, including NSFW, travel, and food, among others.