When comparing IMO vs Chatwee, the Slant community recommends IMO for most people. In the question“What is the best team chat software?” IMO is ranked 20th while Chatwee is ranked 47th.
Ranked in these QuestionsQuestion Ranking
Pro Video call support
Pro Beautiful User Interface
Although IMO has a comparable, and in some cases superior, feature set when compared to the competition its key selling point is its interface.
From LifeHacker when it won "Best IM Client":
Signing on, navigating chats by tapping the tabs at the bottom, searching for buddies, and virtually any other operation is easy to find and use. The app, itself, is very quick. Even sending a voice IM, if you don't feel like typing, is responsive and sends quickly. Everything imo does it does well, but it's excellent navigation really makes it top notch.
IMO also has a fully functional website that you can use for chat while on your desktop or laptop. This really puts IMO ahead of the competition as you can use the same system on all your devices so you don't have to deal with overlapping notifications etc. (Note: IM+ also has this feature)
It should also be noted that it has the highest rating in the App Store due to both the UI and its stability.
Pro Easy to switch between conversations with tabs
Tabbed chats make it easy to switch between conversations
Pro Lists and chat histories are searchable
Both your buddy lists and chat histories are searchable.
Pro Accounts can be linked so you don't have to sign in to several accounts
Pro Push notifications
Pro Concurrent sessions
Concurrent sessions allow you to be logged in on your desktop while also being logged in on your phone.
Pro Chat groups
Pro Has a free-forever option
A bit less options available but works nonetheless.
Pro Real-time media and file sharing
Including YouTube videos and pictures preview in the chat window.
Pro Plenty of customization options
Chat size, color, fonts, language, log in methods, notifications, emojis, privacy, powerful moderation and many more.
Pro Single Sign-on
Users, who log in to the site, are automatically logged in to the chat.
Pro Integrated with 25+ most popular CMS
Developers provide easy to follow, clear plugin installation instructions.
Pro Clean design
Chatwee has a clean and easy to use UI. On the left there's a clean and defined user list, each name has a flag next to it. It's also very easy to move from one side of the screen to the other. There's only the most useful information on the screen at any time and the design never feel overwhelming or cluttered.
Con No support for third-party instant messaging networks
On March 3, 2014, IMO will start discontinuing support for all third-party instant messaging networks.