Yo 1.0.5 for iOS (iPhone screenshot 001)Yo 1.0.5 for iOS (iPhone screenshot 002)

There’s a new messaging app in town and it’s unlike anything you’ve ever tried. It’s lightweight and efficient, doesn’t require you to provide a screen name, won’t ask for your cell phone number nor will it pester you with ads – and boy is its Home screen icon unique.

It’s called Yo. (with the full-stop) and could easily be the simplest and most efficient communication tool in the world, with an insane twist on the mobile messaging concept…

Forget about smileys, auto-disappearing messages, the 140-character limit, video/audio messages, media transfers and other features commonly associated with modern messaging and micro-blogging platforms.

In Yo., all your feelings, moods, expressions and thoughts get compressed into a two-character message: “Yo”.

I kid you not, this is from iTunes release notes:

Yo is everything and anything, it all depends on you, the recipient and the time of the Yo.

Wanna say “good morning”? just Yo.
Wanna say “Baby I’m thinking about you”? – Yo.
“I’ve finished my meeting, come by my office” – Yo.
“Are you up?” – Yo.
The possibilities are endless.

We don’t want your email, Facebook, there is no search, no nothing. just Yo.

Open the app, tap Yo, that’s it.

It’s that simple. Yo.

They don’t call it “a single-tap zero character communication tool” for no reason.

App icon?

Here.

Yo 1.0.5 for iOS (app icon, small)

Developers said Apple at first rejected the app because its reviewers thought the icon was incomplete.

I’m not sure which is crazier: that the app – which conveniently launched on April Fools’ Day – has already seen two million messages sent just last month or that its developer has managed to secure a cool $1.2 million in funding.

Anyway, if you want to give Yo. a whirl, go ahead and grab it for free in the App Store.

The app is iPhone/iPod touch only and requires iOS 5.0 or later.

See also: Snapchat’s new Our Story feature, Slingshot, Facebook’s take on ephemeral messaging apps, Facebook Messenger picks up Big Likes and Instant Video Sending, BlackBerry ditches BBM PINs in iOS app update.