Interesting product. But I can see why other HNers are not so kind to it. It's probably because they are not the target market you should be going after. Nobody is going to switch from Slack to Woice simply because they can now send an audio message - I am sure there apps on Slack that can do this.

Instead of going after the enterprise collab segment which is already highly competitive and does well with text, I think this product needs to go after industries where audio is a necessity.

Say media production companies where video makers collaborate with voice artists. Or, english teaching groups where students submit their homework in audio.

These are all large niches to go after and I am not really sure if there are collaboration tools targeted entirely at them.