Top 13 Publisher Ad Server Software SaaS Companies in May 2026

New York, New York, United States

AdKernel is a white-label advertising serving platform that offers fast, efficient and feature-rich online advertising solutions to publishers, advertisers, and networks. We offer Programmatic Display & Video White-label Ad Serving Solution, Programmatic White-label Media-buying Platform (DSP), Server Side Header Bidding platform (prebid compatible), Variety optimization and analytic tools. All white-label platform are fully customizable and has built-in optimization algorithms and real-time statistics pulling for partner feeds and real-time analytics. Thanks to the company’s industry-leading role in providing enterprise-class solutions for pay-per-click, display and video, mobile and desktop markets, we help clients to maximize their revenue and eliminate technological headache, more and more companies are choosing adKernel. Our team has deep expertise in digital advertising, distributed database, predictive analytics, real-time decision making, and big data technology. Our platform has been developed entirely in-house, giving us an extraordinary degree of control over its performance, flexibility, speed, and reliability.

Copenhagen, Capital Region, Denmark

Passendo is the first dedicated email ad server built for publishers who want full control, better performance, and smarter monetization. From global media giants to niche newsletters, publishers trust Passendo to turn email ads into a consistent and scalable revenue stream. We empower publishing teams to: 🟣 Serve native, responsive, and dynamic email ads 🟣 Run direct and programmatic campaigns side by side 🟣 Improve targeting with first-party data and smart segmentation 🟣 Unlock new revenue streams with flexible formats and pricing models 🟣 Gain full control over ad placement, pacing, and frequency 🟣 Get real-time insights with reliable reporting 🟣 Integrate seamlessly with your ESP, OMS, and DSP 🟣 Automate workflows without compromising on quality or performance Our platform is privacy-first, fully customizable, and built for teams that care about performance and user experience in equal measure. And we’re not stopping there. We’ve developed our own DSP, giving you access to premium demand without relying on third-party platforms. And we’ve launched The Monetization Club – a curated community where forward-thinking publishers unlock new opportunities together. Email ad serving – solved.