Chalk

Chalk is a communication application designed to help users to talk instantly. Put simply, it is about replacing internal email with channels and direct messages.

The natural audience is every team. Alongside the main category they mention Audio, Messaging, Private Social Networking, Social and Social Network. As a very small product team themselves (1 to 10 people), they tend to serve customers of a similar scale best. You will probably talk to the people who build it, which is great until you need 24/7 support.

Chalk is based in San Francisco, California. Their site is chalkapp.com.

Things worth asking about: search, retention policies, and external guest access. A short pilot with your real data tells you more than any demo.

The facts above come from public company records. The score will come from people like you. Used Chalk? Rate it.