Yo

An app that said one word, raised a million dollars, and became the whole 2014 app economy in miniature

Zombie
19902026

Yo was a mobile app by Israeli developer Or Arbel, built in eight hours at the suggestion of Mobli chief Moshe Hogeg and launched on 1 April 2014. Its only function was sending the word Yo to a friend as a notification. It reached the top of the app charts, raised over $2 million at a valuation reported between $5 and $10 million, spawned an API that sent Yos for World Cup goals and FedEx parcels, and faded within a year. The company shut in 2016; the app lingered on autopilot.

Timeline [edit]

  1. 2014
  2. 1 April 2014 Launch
    Yo launches

    Built in eight hours; initially rejected by Apple.

  3. 18 June 2014 Funding
    $1 million at a multi-million valuation

    The bubble headline of the summer.

  4. 20 June 2014 Incident
    Hacked by a college student

    Phone numbers exposed; the hacker gets hired.

  5. July 2014 Peak
    World Cup goal Yos

    The API becomes the interesting part.

  6. 2015
  7. June 2015 Version
    Yo 2.0

    Photos, location, groups.

  8. 2016
  9. 2016 Shutdown
    The company winds down

    The app stays on autopilot.

The site through time

Read the old front page here, in one piece, from our own capture: justyo.co, 5 June 2014 →

Browse justyo.co as it was, via the Internet Archive's Wayback Machine:

2014 2015 2016 Full archive →

Ownership [edit]

Life Before Us, LLC (Yo) 2014–2016 Founded Or Arbel, backed by Moshe Hogeg; offices in Tel Aviv and San Francisco

Why it shut down [edit]

Official line: The company behind Yo wound down in 2016 when the money and the joke both ran out. Or Arbel kept the servers on autopilot, funding maintenance through a Patreon from 2018, so the app has occasionally still worked without being in any sense alive.

Our analysis: Yo was a novelty that accidentally made a serious point. A single button that sent the word Yo was mocked as the emblem of a funding bubble, a million dollars for an app built in eight hours, and the mockery was fair. But push notifications as a language, one tap meaning I am here, it is ready, come now, was a real idea: the World Cup goal alerts and the FedEx delivery Yo showed that context can carry the entire message. There was never a business under it. The user counts fell as fast as they rose, an update added links and photos that nobody wanted, and by 2016 the company was gone while the button, cheap to run, refused to fully die.

History [edit]

One button

Moshe Hogeg wanted a one-tap way to summon his assistant, and asked Or Arbel to build it. Arbel finished in about eight hours, and Yo launched on 1 April 2014, a date everyone assumed was the point. The screen was a list of friends\' names; tapping one sent them a push notification that said Yo, in a voice. Apple initially rejected it for being too simple. Two months later a Product Hunt listing set it off: top ten in the App Store, tens of thousands of users a day, and a reported $1 million investment led by Hogeg himself, followed by another $1.5 million at a valuation put between $5 and $10 million. Think pieces asked what it meant that this was fundable. In June 2014 a college student hacked it, exposing user phone numbers; Arbel fixed the hole and hired him.

The notification was the message

The API was the interesting part. The World Cup service sent a Yo for every goal. FedEx sent a Yo when your parcel was out for delivery. A bakery Yo\'d when the bagels were fresh out of the oven; an Israeli service Yo\'d rocket alerts. Stripped of content, a notification from the right sender at the right moment said everything, which is the insight every app\'s push strategy now runs on. Updates added links, photos, location and groups, each one making Yo more ordinary. By 2015 the chart position and the joke had both expired, and in 2016 the company wound down. Arbel kept the servers running out of pocket, opened a Patreon for maintenance in 2018, and the app has drifted between working and not working ever since, which is why this record says zombie rather than dead.

The domain today

justyo.co has intermittently offered the app and a farewell note, depending on the year you check.

Similar projects

Wunderlist The to-do app Microsoft bought to bury 2010–2020 Google Goggles Point your phone at a landmark, a book or a wine label and Google told you what it was, eight years before Lens replaced it 2009–2018 Gowalla The prettier check-in app from Austin that lost the SXSW war to Foursquare, was bought by Facebook for its team and switched off three months later 2009–2012 Readmill The Berlin e-book reader that put your highlights in the margin for other people to see, bought by Dropbox for its team and closed within three months 2011–2014 Astrid The to-do app with the friendly squid, four million users, bought by Yahoo and closed 96 days later 2008–2013 Color Forty-one million dollars before launch, an app nobody understood, and a shutdown within two years: the cautionary tale of the 2011 app boom 2011–2012

Sources [edit]

  1. Yo (app) Wikipedia 1 January 2024 [archived]
  2. Yo raises $1 million TechCrunch 18 June 2014 [archived]
  3. justyo.co in the Wayback Machine Internet Archive 1 July 2014

Last verified: 31 August 2026. Spotted an error? Suggest an edit (corrections with sources are reviewed and applied).