Ghost user retargeting: fake install fraud on retargeting campaigns
Retargeting campaigns targeting users from fake installs serve ads to ghost users who never genuinely installed your app and can never re-engage. Tapper removes fake install users from your retargeting audiences so your re-engagement budget reaches real lapsed users.
Trusted by leading brands worldwide
Fake install users turn your retargeting audiences into ghost user pools
Ghost user retargeting is a downstream consequence of fake install fraud that many mobile advertisers underestimate. When fake installs, whether from SDK spoofing, device farms, or click injection, enter your MMP and populate your user database, those phantom users become eligible for retargeting campaigns once they pass the install recency threshold. Your retargeting campaigns then actively serve ads to users who never existed as genuine customers, consuming re-engagement budget on an audience that can never respond because they are not real people. Every impression, every click, and every ad served to a ghost user is pure waste with zero chance of genuine re-engagement.
The scale of ghost user retargeting depends directly on your fake install rate. If 28% of your installs are fraudulent globally, and those installs accumulate over multiple months of campaign activity, a significant portion of your retargeting audience may consist of ghost users. Tapper addresses this upstream by removing fake installs at the install layer before they enter your user database, and downstream by auditing existing retargeting audiences against fraud signals to identify and suppress ghost user segments that have already accumulated from historical fake install traffic.
How Tapper stops fake installs on Mobile retargeting
Three steps from connection to clean campaign data, no engineering required.
01
Connect your MMP and retargeting stack
Tapper integrates with AppsFlyer, Adjust, Kochava, Singular, and Branch alongside your retargeting networks, auditing your install history and retargeting audience for fake install users.
02
Ghost users identified and removed from retargeting audiences
Tapper applies install-level fraud analysis to your user database, identifying device IDs, advertising IDs, and user segments associated with fake installs and suppressing them from your retargeting audience lists.
03
Retargeting budget reaches genuine lapsed users only
With ghost users suppressed from your retargeting audience, your re-engagement budget is allocated entirely to real lapsed users who have genuine purchase and engagement potential.
Fake installs on Mobile retargeting by the numbers
Data from Tapper's platform analysis and published industry research.
28%
Of mobile installs are fraudulent globally
$10B
Lost to mobile ad fraud in 2023
40%
Of mobile ad fraud uses SDK spoofing techniques
90%
SDK spoofing detection rate by Tapper
Tapper vs MMP Built-in Fraud Protection
See exactly where the gaps are, and why they matter to your retargeting performance.
Ghost user identification
Audits retargeting audience against fake install signals
No retargeting audience fraud audit
Upstream install fraud prevention
Removes fake installs before they enter user database
Fake installs populate retargeting audiences
Retargeting audience quality
Audience cleaned of ghost user segments
Ghost users remain in retargeting pool
Re-engagement rate accuracy
Re-engagement rates calculated on genuine users only
Ghost users dilute re-engagement metrics
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 about fake installs on Mobile App retargeting.
Fake installs, whether from SDK spoofing, device farms, or click injection, generate install events that are recorded in your MMP user database alongside genuine installs. Those fake device IDs and advertising IDs accumulate in your user records and eventually qualify for retargeting campaigns based on your recency rules. Unless fake installs are identified and suppressed at the install layer, they automatically become eligible for retargeting.
Yes. Tapper can analyse your historical install data against fraud signals to identify which device IDs and user segments in your retargeting audience are associated with fake installs. This retrospective audit produces a suppression list of ghost users that can be applied to your current retargeting campaigns immediately, improving the quality of your active re-engagement audience without waiting for new install data.
Ghost users never generate revenue because they are not real people. Every impression served to a ghost user and every click from a ghost user interaction (if a fraud operation simulates clicks on retargeting ads) consumes budget with zero revenue potential. Your retargeting ROAS is suppressed by ghost user activity in proportion to the share of your audience that consists of fake install users. Removing ghost users from your audience improves your retargeting ROAS by concentrating spend on users who can actually re-engage and purchase.
Other fraud types on Mobile App retargeting
Retargeting campaigns face multiple fraud threats. Tapper protects against all of them.
Stop fake installs on your Mobile retargeting
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