SUMAX, Online Marketing Agentur

Since we started working with SUMAX, we’ve been completely satisfied. The team is highly professional, always easy to reach, and implements our requests quickly and reliably. We’d especially like to highlight the pleasant communication and the strong commitment they bring to improving our website and online presence. After only a short time, we were already able to see initial positive developments. We’re looking forward to continuing our collaboration and are confident that together we’ll be able to deliver many more successful projects.

I’d like to offer my heartfelt thanks to the entire SUMAX team for the excellent collaboration. After many years of experience, I can say this: people with real expertise, professionalism, and a strong sense of responsibility work here. Communication is reliable, advice is honest, and projects are implemented with great care and know-how. What I especially appreciate is that at SUMAX, it’s not just the final result that matters—the focus is also on quality, sustainability, and the customer’s success. Thank you to the entire team for the great support. I can recommend SUMAX with full confidence.

We haven’t been working with SUMAX for very long yet, but after just a short time we’re already genuinely very happy with the results. Jonas and Celine are doing a great job—our website looks fantastic, communication is always professional and straightforward, and you can quickly see initial progress thanks to their strong commitment. We’re looking forward to continuing our collaboration and can’t wait to see what else will be achieved in the future.

Top Online Marketing Agency, Highly Recommended! At Provinzial Isiktekin & Ünlü, we were looking for an agency that could really boost our online presence—and that’s exactly what Sumaxx from Dortmund delivered. Quick implementation. No lengthy back-and-forth, no waiting. The project was carried out efficiently and in a structured manner. Professional consulting. From the very beginning, they addressed our industry and our goals, no cookie-cutter solutions, but genuine consulting on an equal footing. Tangible results. What matters in the end: We are demonstrably gaining more customers through the internet. That was exactly the goal.

I am extremely satisfied with Sumax's services. ⭐️⭐️⭐️⭐️⭐️ My visibility and conversion rates have improved significantly as a result of our collaboration—in some cases, they’ve even tripled or quintupled. Their work is professional, transparent, and, above all, successful. In my opinion, Sumax is definitely one of the best SEO agencies out there. I highly recommend them!

I am extremely satisfied with Sumax's work. Not only did everything Sebastian Jacobs promised me come true, but it actually exceeded my expectations.

I had a fantastic experience—I highly recommend it! Everything was extremely professional!