Integrating several collaboration apps into one, TwitHaven for Mac provides your organization with a straightforward way to communicate and stay up to date on projects. It's a subscription-based app that comes with many features and supports all desktop platforms. Don't expect it to be perfect or super fast, though.
When launched for the first time, TwitHaven for Mac asks you to sign in. If you're a new user, you are offered a two-month trial membership for which you need to register. The application's main interface is clean and well organized, giving you a clear view of messages, recipients, and attachments, as well as a neat search box. However, once you launch the app's Preferences window, things become a bit overwhelming, as there are many options to set. Since all of the app's data is stored in the cloud, you will notice a delay for nearly every action you take within the app, something which can disrupt an otherwise fast-paced workflow. Two nice features include automatic message readouts and password-protected messages, but the fact that you can view attachments for protected messages makes the last feature less useful. In addition, you cannot attach files larger than 1MB; the app suggests you use DocHaven for this. Another quirk to consider is that once the application's main window is closed, the only way to summon it is to press Command+T or go to the Window menu. Doing that always creates a pop-up window called "Menu," which lets you access other apps like DocHaven and CRMHaven and cannot be dismissed, only minimized.
TwitHaven for Mac impresses with its concept, but suffers from somewhat poor execution and performance. Nevertheless, if you need an internal messenger application for sending short messages and attachments, this one might work for you. But before upgrading to any of the Pro subscriptions, do test the free trial, yourself, to see if it's actually worth giving up on your current messenger app.