In brief
A successful app can be simple, convenient and meet users’ needs. Yo, which only lets users send “Yo,” gained 20,000 users in one month and attracted US$1.2 million in investment after being created in just eight hours.
A seemingly pointless mobile app called “Yo” somehow became an overnight sensation?! In just one month, Yo amassed 20,000 users.
Yo is an app that could hardly be simpler. It has just one function: sending “Yo” to let someone know “I want to get in touch with you” or “I miss you.”
Yo may be silly, but it is still a successful app. It even attracted US$1.2 million in investment! And this million-dollar mobile app was created in just eight hours, showing that good apps can be built in a short time.
This app is a true oddity in the app market. Its example shows us that a successful mobile app can be extremely simple. It does not need complex features; simplicity, convenience and meeting users’ needs are enough.
Finally, if Yo let users send “Yo” in their own voices, users would surely go wild for it!


More about how Yo came into being: http://www.hksilicon.com/kb/articles/511467/Yo