To earn more from in-app ads, choose formats that fit your app's natural breaks (rewarded video for opt-in value, interstitials at pauses, native and banner ads where they do not disrupt), use mediation with bidding so multiple networks compete for each impression, set up app-ads.txt and a certified consent flow, and follow placement policies closely. Then measure revenue per daily user and retention together, because ads that drive uninstalls cost more than they earn.
How in-app ad revenue works
Ad networks pay for impressions or clicks, and revenue is usually summarised as eCPM: effective revenue per thousand impressions. Your total ad revenue depends on how many users you have, how often they see ads, which formats they see, the eCPM for each format and country, and fill rate, the share of ad requests that receive an ad.
Google AdMob is one of the most widely used ad platforms for apps, and many developers also use mediation platforms that connect several ad networks. The principles in this guide apply across platforms.
Choosing ad formats
Rewarded ads let users opt in to watch a video in exchange for in-app value, such as extra lives or hints. They usually earn high eCPMs and are well tolerated because users choose them. Interstitials are full-screen ads shown at natural transitions, such as between levels. App open ads appear when users open or return to the app. Native ads match your app's design, and banners sit at the top or bottom of the screen.
Use the fewest formats that fit your app. A puzzle game might rely on rewarded ads and occasional interstitials between levels; a news app might use native ads in the feed and banners on article pages.
Placement that respects users
Place ads at natural breaks, not during core tasks. Interstitials should not appear immediately on launch, during gameplay, or in a way that causes accidental clicks. Rewarded ads should clearly explain the reward and deliver it reliably. Frequency caps prevent fatigue.
Bad placement is both a policy risk and a retention risk. Ad networks prohibit layouts that encourage accidental clicks, and users uninstall apps that feel spammy. Our guide to reducing app uninstalls explains how intrusive experiences drive churn.
Mediation and bidding
Mediation lets several ad networks compete to fill your ad requests. In waterfall setups, networks are called in order of expected price. In bidding, networks bid in real time for each impression, which usually raises competition and simplifies management. Many publishers use bidding with a few waterfall fallbacks.
Add networks with demand in your top countries, test their impact on overall revenue, and avoid adding so many SDKs that app size and stability suffer. Our guide to app size and conversion explains why heavy SDKs can cost installs.
Levers that raise eCPM
eCPM rises with more competition (bidding and additional demand sources), better ad formats (rewarded and full-screen formats typically earn more than banners), audiences in high-value countries, and higher user consent for personalised ads where allowed. Seasonality matters too: ad prices often rise in the fourth quarter as advertisers increase budgets.
Avoid chasing eCPM alone. Showing fewer, better-placed ads can raise eCPM but lower total revenue; showing more ads can lower eCPM but raise revenue until retention suffers. Optimise revenue per daily active user and long-term retention together.
Consent and privacy
Ads often rely on personal data, so consent rules apply. In the European Economic Area, the UK, and Switzerland, Google requires publishers using its ad products to use a certified consent management platform, such as Google's User Messaging Platform, to collect consent. On iOS, tracking across apps requires App Tracking Transparency permission, covered in our ATT prompt guide.
Disclose ad SDK data collection accurately in your App Privacy details and Google Play Data safety form. Our guide to privacy labels and Data safety explains how to account for third-party SDKs.
app-ads.txt and fraud protection
The app-ads.txt standard lets you publish a file on your developer website listing the ad networks authorised to sell your inventory. Advertisers and networks use it to avoid spoofed inventory, and missing or incorrect app-ads.txt files can reduce demand. Make sure the developer website listed in your store listing hosts a correct file.
Monitor invalid traffic warnings from ad networks and never click your own ads or encourage users to click. Invalid activity can lead to limited ad serving or account suspension.
Ads and app store policies
Both stores have policies on ads. Google Play's ads policy prohibits disruptive ads, such as full-screen ads that cannot be closed or ads that appear outside the app unexpectedly. Ads must also be appropriate for your app's content rating and audience; apps for children have strict rules on ad content and data use, covered in our kids and family app ASO playbook.
Ad-heavy experiences also show up in reviews. Our improve app ratings guide explains how to protect ratings while monetizing.
Hybrid monetization: ads plus purchases
Many apps combine ads with an ad-free purchase or subscription, letting users who dislike ads pay to remove them. Others combine rewarded ads with in-app purchases in games, where some players watch ads and others buy items. Hybrid models often maximise total revenue.
Make sure ads do not undermine purchases, for example by offering so many rewarded items that buying becomes pointless. Our hyper-casual and hybrid-casual game ASO guide covers the shift from ad-only to hybrid monetization in games.
Measuring ad monetization properly
Track revenue per daily active user (ARPDAU), impressions per user, fill rate, eCPM by format and country, and retention by ad exposure. Compare cohorts with different ad frequencies to find the balance between revenue and retention, as explained in cohort analysis for mobile apps.
Ad revenue also feeds lifetime value. Include it in your LTV calculation so paid acquisition decisions reflect total user value.
Common ad monetization mistakes
Showing interstitials too often or at disruptive moments is the most common mistake, driving uninstalls and policy warnings. Others include adding too many ad SDKs, skipping app-ads.txt, ignoring consent requirements, and optimizing eCPM rather than total revenue and retention.
Developers also forget to test ad changes with control groups, so they cannot tell whether a change truly increased revenue or simply shifted it.
A worked example: a casual game tunes its ads
A casual puzzle game shows an interstitial after every level and sees poor day-7 retention. The team limits interstitials to every third level after the first five minutes of play, adds a rewarded ad for hints, enables bidding with two additional networks, and publishes app-ads.txt.
A holdout test shows total ad revenue per user rises because rewarded ads earn strong eCPMs, while day-7 retention improves with fewer interstitials. The team then adds a one-time ad removal purchase for players who prefer not to see ads.
How to do it, step by step
- Pick formats that fit natural breaksChoose rewarded, interstitial, native, banner, or app open ads based on your app's flow.
- Set placement rules and capsAvoid ads during core tasks or on launch, and cap frequency per user.
- Enable mediation with biddingAdd networks with demand in your key countries and let them compete.
- Handle consent and app-ads.txtUse a certified consent platform where required and publish app-ads.txt on your developer site.
- Measure revenue and retention togetherTrack ARPDAU, eCPM, fill rate, and retention, and test changes against control groups.
Before and after examples
Illustrative examples written for a generic app in this category, not client results. Swap in your own product, audience, and data.
After every level, including the first.
Every third level after the first five minutes, with a cap per session.
Why it works: Fewer, better-timed interstitials protect retention.
Watch ad?
Watch a short video to get a free hint.
Why it works: Clear value increases opt-in rates.
Highest eCPM.
Highest revenue per daily user with stable day-7 retention.
Why it works: Total, retention-aware revenue is what matters.
Action plan
- Use rewarded ads for opt-in value
- Place interstitials only at natural breaks
- Enable bidding across several networks
- Publish a correct app-ads.txt
- Collect consent where required
- Optimize revenue per user and retention together
Metrics to monitor
- Revenue per daily active user
- eCPM by format and country
- Fill rate
- Impressions per user
- Retention by ad exposure
Record the baseline, release date, audience, markets, and external changes before interpreting movement. Rankings and conversion are useful signals, but a decision is stronger when activation, retention, and business value confirm that the page attracted the right users.
Frequently asked questions
What is eCPM?
Effective revenue per thousand ad impressions, a standard way to compare ad performance across formats and networks.
Which ad format pays the most?
Full-screen formats such as rewarded video and interstitials usually earn higher eCPMs than banners, but the best format depends on fit with your app.
What is ad mediation?
A system that lets multiple ad networks compete to fill your ad requests, through waterfalls or real-time bidding.
Do I need app-ads.txt?
It is strongly recommended. It verifies authorized sellers of your inventory and can protect demand and revenue.
Do I need consent for ads?
In many regions, yes. Google requires a certified consent management platform for users in the EEA, UK, and Switzerland, and iOS tracking requires ATT permission.
Do ads hurt app ratings?
Intrusive or frequent ads often do. Well-placed, opt-in formats and frequency caps reduce the impact.
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