Recordfy is a simple tool that enables you to send audio messages directly on Slack. You can send it directly to team members or channels.

You also have the option to send Speech-to-Text transcription (powered by Google Cloud Platform) with your audio. Why is this awesome? - not everyone likes listening to audio messages (or might not be in a place where it's possible); - text messages are searchable, so you can easily find an audio message later;