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What is Mobile Ad SDK?

Also known as: SDK, Ads SDK, Monetization SDK

Quick definition

A mobile ad SDK is a software library that app developers embed to request, render and track ads (banner, interstitial, rewarded video, native) inside an app, handling device signals, consent and creative display that a web page would otherwise handle through tags.

How it works

  1. Developer integrates the SDK and initialises it with an app ID
  2. App requests an ad for a placement; the SDK collects device, app and consent signals
  3. Request goes to the ad network or a mediation layer, sometimes as an in-app bidding auction
  4. SDK downloads and caches the creative, then renders it when the placement is shown
  5. Impression, click and reward callbacks are reported back to the network and the app

Key points

Mediation
Mediation SDKs (e.g. AppLovin MAX, Google AdMob, Unity LevelPlay) call many network adapters and choose a winner by waterfall or in-app bidding.
Privacy
SDKs read IDFA only after iOS ATT consent, use GAID on Android and must pass TCF/GPP signals; app privacy manifests now declare their data use.
Performance
Each SDK adds app size, start-up time and crash/ANR risk, so developers limit the number of adapters.
Measurement
Open Measurement SDK (OM SDK) lets third-party verifiers measure viewability inside apps.

Benefits

  • Native rendering and caching give smooth full-screen formats
  • Direct access to in-app signals improves monetization

Trade-offs

  • Updating requires app releases, so fixes roll out slowly
  • SDK bloat and data-collection concerns for developers

FAQ

What is the difference between an ad SDK and a mediation SDK?

An ad SDK connects to one network's demand; a mediation SDK sits above several networks' adapters and decides which demand fills each impression.

What is in-app bidding?

In-app bidding is the app equivalent of header bidding: networks bid simultaneously for an impression instead of being called one after another in a waterfall.

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Official sources

Last reviewed 2026-10-27. Explanations are written by AdTech Radar; consult the official specification for implementation.