ironSource Ads

» see ironsrc.com as it lived, on the wayback machine

~ the eulogy ~

Unity announced on 26 March 2026 that it was sunsetting the direct demand business of the ironSource Ads network, and the thing was gone inside five weeks. New publishers and new campaigns stopped on 15 April, the network stopped serving on 30 April, and advertisers had until 31 May to pull their reporting out before the dashboard closed behind them.

If you have opened a free mobile game in the last decade you have watched advertising that came through this pipe. ironSource Ads was the direct demand side of it: the network that took money from advertisers who wanted installs, matched that against publishers with space to sell, and served the interstitial or the rewarded video standing between you and your next life.

This was never a product anyone used on purpose. It is infrastructure, and the only people who saw the name were the developers who put its SDK in a build and the media buyers spending against it, neither of which I have ever been. What earns it a grave is the price tag. Unity paid $4.4 billion in stock for ironSource in November 2022 and then, three and a half years later, turned off the part with the word Ads in the name.

~ the dossier ~

~ how it got that big ~

ironSource started in Tel Aviv in 2010 under Tomer Bar-Zeev, and the early money came from software distribution: bundling installers, monetizing downloads, the sort of business that gave a lot of companies a reputation problem during the toolbar years. It moved into mobile game monetization, got extremely good at it, and went public through the Thoma Bravo Advantage SPAC on 29 June 2021, ringing the NYSE bell under the ticker IS on the strength of showing rewarded video to people playing puzzle games.

Unity bought it in an all-stock deal that closed on 7 November 2022 at roughly $4.4 billion, over the loud objection of a large number of Unity's own developers who did not love the idea of a game engine married to an ad network. AppLovin tried to break the deal apart with a hostile counterbid for Unity itself. Unity's board said no and closed with ironSource anyway.

~ what actually stopped ~

The sunset is narrower than the headline makes it sound. LevelPlay, the mediation layer that runs an auction between competing ad networks every time a game needs to fill a slot, was explicitly untouched, and so was the ironSource Exchange on the programmatic side. What died was Unity selling ad inventory itself, in direct competition with Google and AppLovin, holding a fraction of the data either of them sits on.

That distinction is the whole shape of the business. Mediation is a tollbooth and it earns at any volume; a demand network is a market-share fight against companies that own the phones and the feeds people look at all day. Unity also sold Supersonic, the game publishing arm that came over in the same merger, completing that on 4 August 2026. Of a $4.4 billion purchase, what Unity kept is the auction it runs between other people's ad networks.

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