Stop ad fraud on mobile app retargeting campaigns
Retargeting campaigns are targeted by fraudsters who inject fake re-engagement clicks to claim attribution credit for organic user returns. Tapper identifies invalid retargeting traffic before it distorts your re-engagement ROAS or drains your reactivation budget.
Trusted by leading brands worldwide
Mobile retargeting fraud exploits attribution windows to steal credit for organic re-engagement
Mobile app retargeting campaigns are designed to bring lapsed users back to your app, and the payout model, typically cost-per-re-engagement or cost-per-action, creates a clear fraud opportunity. Fraudulent publishers and click injection operations monitor when users who are already in your retargeting audience open your app organically, then fire a fraudulent retargeting click timed to appear in the attribution window immediately before the session. Your MMP records a re-engagement attributed to the fraudulent source, the publisher collects a payout for a return they played no role in driving, and your organic re-engagement rate appears lower than it actually is.
The fraud extends beyond simple attribution theft. Click flooding on retargeting campaigns, where fraudulent publishers generate high volumes of clicks against your retargeting tracking links, crowds out legitimate click attribution and artificially inflates apparent reach. Your retargeting platform reports high click volumes and plausible conversion rates, but the underlying user behaviour is a combination of genuine returns being misattributed and a small number of real re-engagements being attributed correctly. Distinguishing these patterns without dedicated fraud analysis is effectively impossible from MMP data alone.
Retargeting fraud is particularly damaging because retargeting budgets are typically justified on the basis that they are re-activating high-value users, people who have already demonstrated intent to use your app. When fraud corrupts the ROAS calculation for these campaigns, the justification for retargeting spend is undermined. UA managers either over-invest in retargeting channels based on inflated apparent performance, or they pull retargeting spend entirely after seeing poor downstream metrics once the initial fraudulent attribution data starts to decay. Neither outcome is correct. The solution is clean data from the start.
How Tapper protects your retargeting on Mobile
Three steps from connection to clean campaign data, no engineering required.
01
Connect Tapper to your MMP and retargeting networks
Tapper integrates with AppsFlyer, Adjust, Kochava, Singular, Branch, and your retargeting partners, monitoring every re-engagement click and session event across all active retargeting campaigns.
02
Invalid re-engagement clicks identified and blocked
Click injection timing patterns, click flood velocity, and behavioural scoring flag fraudulent retargeting clicks before they claim attribution credit for organic user returns. Organic re-engagements are correctly attributed in your MMP.
03
Retargeting ROAS reflects genuine reactivations only
With fraudulent re-engagement clicks excluded, your retargeting ROAS is anchored to campaigns that are actually driving user returns. You can evaluate retargeting channel performance and budget allocation with confidence in the underlying data.
Retargeting fraud by the numbers
Data from Tapper's platform analysis and published industry research.
38%
Of app campaigns experience attribution fraud affecting re-engagement data
$10B
Lost to mobile ad fraud globally in 2023
28%
Of mobile ad events are fraudulent on average across the funnel
Tapper vs MMP Built-in Fraud Protection
See exactly where the gaps are, and why they matter to your campaign performance.
Click injection detection on re-engagement
Anomalous CTIT and timing pattern analysis
Basic CTIT threshold rules only
Click flood detection
Velocity and pattern analysis per retargeting source
Post-attribution review only
Organic re-engagement protection
Organic returns correctly attributed in MMP
Organic credit vulnerable to click injection
Retargeting ROAS accuracy
Fraudulent re-engagements excluded from ROAS
Fraudulent attribution inflates reported ROAS
Cross-network retargeting monitoring
All retargeting partners in one dashboard
Single MMP or network view only
Attribution window protection
Fraudulent clicks blocked before attribution fires
Fraudulent clicks claim credit before review
Trusted by industry leaders
See how companies are protecting their ad budgets and improving ROI with Tapper.
“Tapper played a key role in improving the efficiency of Du's performance marketing activity by addressing traffic quality issues within campaigns. Following implementation, Du achieved a 13% reduction in CPA and an 8.6% increase in order rate, demonstrating a clear improvement in conversion quality and overall campaign effectiveness.”
Joseph Elbcherrawy
Client Leadership Director, Mindshare, a WPP Media Brand
“During our Tapper trial for INFINITI, we uncovered low-quality traffic that wasn't visible inside the platforms. Removing it delivered a 14% uplift in conversions and an 11.4% reduction in CPA - a meaningful efficiency gain for INFINITI's 2026 growth plans.”
David Barnes
Data & Technology Lead, Omnicom Group
“With Tapper's protection we were able to identify and block invalid clicks in real time. The impact was immediate as our cost per acquisition dropped by 30% and ROAS improved significantly. More importantly, Tapper gives us the confidence that our campaigns are reaching genuine customers, which makes it truly invaluable.”
Dimitris Bakas
Senior Performance Marketing, Public Group
“We started using Tapper to get better visibility on where our clicks were coming from, and ended up cutting wasted spend by over 12%. The performance uplift was clear, and for the first time, we could trust the numbers we were seeing. It's a total game-changer for campaign integrity.”
Stuart Parkin
Director of Operations, Regit
“Tapper's blocking technology purifies our paid media traffic which roughly equates to a 36x return against its subscription costs. It's certainly one of the easiest-to-implement tools in our entire marketing stack.”
Reno Mindemann
Head of Growth, Kama Capital
“We've been using Tapper for over a year now, and it has become a core part of how we run paid media. Invalid traffic was always something we knew existed but couldn't really act on. Tapper changed that. We're now saving up to $50K per year, and on PureSquare specifically, we saw around a 20% decrease in CPA. Based on these results, we decided to roll it out across other ventures under Disrupt as well.”
Nurkan Kirkan
GTM Consultant / Paid Growth, Disrupt.com
Trusted by leading brands worldwide
Frequently asked questions
Everything you need to know about protecting your retargeting on Mobile App.
On Android, malicious apps installed on the user's device can detect when the user opens a specific app and fire a fraudulent retargeting click at that moment. Because the click appears immediately before the app session in the attribution window, your MMP credits the fraudulent retargeting source with the re-engagement. The user was going to open the app anyway. The fraud operation has simply inserted itself into the attribution chain to extract a re-engagement payout for an action it did not drive.
Click injection in its classic form is primarily an Android vulnerability because it exploits Play Store install broadcasts. On iOS, retargeting fraud more commonly takes the form of click stuffing and timing manipulation, where fraudulent publishers flood your retargeting tracking links with clicks timed to coincide with known periods of organic user return. Tapper monitors both platforms and applies the relevant detection models for each.
When fraudulent sources claim credit for organic re-engagements, your data overstates how many lapsed users are responding to retargeting and understates natural organic return rates. This distorts cohort-level analysis of which user segments are naturally sticky versus which genuinely respond to re-engagement prompts. Budget and creative decisions based on this data will consistently misallocate retargeting spend.
Networks that rely on third-party publisher ecosystems for retargeting reach, rather than direct inventory, carry the highest risk. In-app advertising placements used to serve retargeting ads on smaller networks are common vectors for click injection. Tapper monitors all retargeting partners you connect and surfaces which sources show anomalous click patterns so you can adjust spend and exclusion lists accordingly.
Your reported re-engagement count will fall to reflect only genuine user returns driven by your campaigns. Your retargeting ROAS may initially look lower because the denominator of claimed re-engagements is smaller. However, because fraudulent re-engagements were not generating real app sessions or revenue, your actual business outcomes do not change. The ROAS figure you see after removing fraud is an accurate reflection of what your retargeting spend is actually producing.
Tapper combines CTIT analysis, click velocity measurement, publisher behavioural scoring, and session validation to classify re-engagement clicks. Fraudulent clicks show characteristic patterns: they arrive in tight clusters around known organic re-engagement windows, they originate from publishers with abnormal click-to-session ratios, and they exhibit timing precision inconsistent with human interaction. Legitimate retargeting clicks show natural variation in timing and are distributed across session windows rather than concentrated immediately before app opens.
Other campaign types on Mobile App
Each campaign type has its own fraud patterns. Tapper covers them all on Mobile.
Stop paying for fraud on Mobile retargeting
Book a demo and we will show you exactly what Tapper would block on your account, before you commit to anything.