The players

Ad fraud and invalid-traffic prevention, built around a Traffic Quality Index (TQI) Score for every source.

ClearTrust's click-fraud and invalid-click protection for performance advertisers.

ClearTrust's publisher-side ad-quality and malvertising protection, delivered with one script tag.

Berlin-based mobile measurement partner, owned by AppLovin since 2021.

European ad verification company, bought by Scope3 in 2024 and then by Peer39 in 2026.

Ad fraud detection focused on accuracy, used for lead-gen and affiliate traffic.

The largest mobile measurement partner, telling app marketers which ads drove installs.

Go-to-market security company blocking fake clicks, fake leads and bots across paid marketing.

Click-fraud blocking for small advertisers, now part of CHEQ as CHEQ Essentials.

Publisher-side ad quality and malvertising protection, used by major news sites.

Publisher-quality intelligence that flags made-for-advertising and risky sites for buyers.

Leading ad verification company checking that ads are seen, safe and served to humans; being bought by Nielsen.

Pre-bid fraud detection for ad exchanges, SSPs and DSPs, plus IP risk data.

Bot-detection company (formerly White Ops) that helped take down major ad fraud schemes like Methbot.

Major ad verification company, taken private by Novacap in December 2025.

UK click-fraud prevention company (formerly PPC Protect) for paid search and social.

Indian ad fraud detection and brand protection company for app and web advertisers.

Fraud and compliance analytics for CTV, apps and web, known for app and privacy risk ratings.

Israeli ad fraud detection company serving publishers, platforms and advertisers.

Japanese ad fraud detection company protecting search, display and affiliate campaigns.

Click-fraud and invalid-traffic protection for Google, Microsoft and app campaigns.