Here’s the Deal

IMO vs IM+

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When comparing IMO vs IM+, the Slant community recommends IMO for most people. In the question“What are the best messaging apps for iOS?” IMO is ranked 20th while IM+ is ranked 24th.

Ranked in these QuestionsQuestion Ranking

Common Questions

What are the best messaging apps for iOS?

What is the best IM client for iOS?

Pros

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
Can send encrypted messages

IM+ has the most extensive client support out of any of its competition and is the only app with the ability to send secure, off-the-record messages.

Pro
Simple user interface

IM+ does the core IM experience incredibly well. The layout is intuitive to use and the very high app store reviews indicate how stable and user friendly the app is.