AppLovin has applied for a temporary restraining order in California seeking to halt Unity from collecting data through its Ad Quality SDK, escalating a months-long rivalry between two of the mobile games industry's largest advertising platforms.

The filing, first reported by Digiday, alleges Unity's SDK has harvested information on ads served by AppLovin — covering creatives, users, devices, revenue and engagement — and used that material to train machine-learning models that compete with AppLovin's own advertising business.

What is AppLovin asking the court to do?

AppLovin wants the court to stop Unity from collecting or using what it calls "Protected Data" and to switch off the relevant data flows within five business days. The company is also seeking changes to the Ad Quality SDK within 30 days.

AppLovin has separately launched arbitration proceedings against Unity over the broader dispute, alleging breach of contract, trade-secret misappropriation and unfair competition. Unity said it intends to oppose AppLovin's application.

Why is AppLovin worried about Unity's SDK?

AppLovin's complaint targets data tied to the auctions that decide which ad wins an impression, plus downstream telemetry on how those ads performed. By collecting that stream from inside game builds, AppLovin alleges, Unity gains visibility into competitors' bidding logic and pricing inputs — signal that could sharpen Ad Quality's own ranking and prediction systems.

That argument turns on what SDKs running inside a publisher's title are allowed to see on the broader ad stack. Unity's Ad Quality SDK sits in games that call ads from many networks, not just Unity Ads, which gives AppLovin standing to complain.

How has Unity responded?

Unity has rejected the framing, describing Ad Quality as "a small, free product" that exists to keep inappropriate and harmful ads out of games.

"AppLovin's legal filings against us are a classic case of a dominant incumbent resorting to litigation and intimidation to address increased competition and slowing growth," a Unity spokesperson said.

The spokesperson added: "In reality, Ad Quality isn't the driver of our improved performance, so they'll be frustrated in that attempt regardless of how this suit is adjudicated."

Unity has also pushed back against AppLovin's position by pointing at AppLovin's own App Review tool — formerly SafeDK — which it described as "far more intrusive" than Ad Quality. AppLovin rejected that parallel, arguing App Review is a moderation layer that only operates on impressions mediated through MAX, rather than building user profiles.

What changes for studios and publishers?

Most publishers route ads through multiple networks at once via mediation layers such as MAX and Unity's LevelPlay, and the dispute cuts across how much telemetry those SDKs can capture from rival demand sources. A ruling for AppLovin could force Unity to rework Ad Quality's data scope inside third-party titles, with material knock-on effects for publishers whose monetisation relies on either platform.

The quarrel is also a proxy argument about who owns the signal generated by an impression that passes through multiple ad networks — a question publishers increasingly expect vendors to answer in writing.

What happens next?

A California court will weigh AppLovin's application for a temporary restraining order, with Unity set to oppose it. The arbitration track runs in parallel. Watch for the court's ruling on the order, the signal any negotiated data-scope carve-out sends to other mediation vendors, and how either side frames its next quarterly results commentary.