SUM Digital Reviews 27

Good experience and nice to collaborate as a trusted digital marketing partner!

the team has lots of experience and the projects moves forward in a very organised way!

We have been working together with SUM Digital for 3 years now. They have really helped us elevate our online marketing and strengthen our reach within our target audience. Their personal approach truly sets them apart, combined with a broad and versatile knowledge that enables them to test, optimize, and refine strategies effectively. We highly value the partnership. - BuurtKadoos

I’ve been part of several major projects, but the one led by SUM Digital was by far the smoothest. Their level of communication is outstanding, everyone knows exactly where they stand and what needs to be done. They make sure everyone is included and take the time to truly understand the company they’re working with. The combination of marketing expertise, creativity, and excellent communication makes this a five-star experience... they truly deliver the complete package.

Not often do you find a business-growth partner that DOES deliver results and that you enjoy working with.

ScaleUp Marketing has that 2-folded benefit of implementing strategies to increase online conversions and sales, while making the collaboration efficient, friendly and even fun.

I strongly advice companies struggling with lead generation, conversion and sales, or that simply want to improve their current results (even if they are already satisfactory), to reach out to Scale Up as they will sweat it out until goals are achieved.

SUM Digital takes strong ownership of the processes that we have agreed, and deliver according to plan. As a growth company we have frequent change requests that SUM Digital handles in a fast and constructive manner. They also dare to challenge us when we get stuck in our own ideas.

SUM Digital brought the clarity and structure we needed to scale. They helped us align sales and marketing, generate high-quality leads and grow into the leading platform in our industry.

We’re proud to be working with SUM Digital For several years now, they’ve been supporting us with our online marketing & sales.

We truly operate as partners. They work like real colleagues, side by side with us. They challenge us when needed, support us, move fast, and go the extra mile, all fully online!

We’re very happy with this collaboration.

Quick responses - professional work.

From the start, the onboarding process with Sum Digital for HubSpot Sales Professional Edition was marked by a high level of flexibility and a genuine willingness to think along with our specific needs. They didn’t just follow a fixed plan—they listened, adapted, and offered expert advice tailored to our workflows and business goals. Throughout the collaboration, it felt like they were an extension of our own team. The end result? A well-functioning HubSpot environment that supports our sales processes with clarity and ease. Thanks to smart setup and automation, we now benefit from increased operational efficiency and have unlocked new upselling opportunities through lead nurturing. We’re very satisfied with both the journey and the outcome, and we’d recommend Sum Digital to any company looking to get real value from their HubSpot investment.

SUM helped us a lot with launching a new digital platform to the world. They have plenty of knowledge and a lot of dedication to help us succeed.

Together we are building on a strong foundation to ensure a predictable and ongoing flow of prospects as the engine for our growth!

Working for SUM has been a great experience.I genuinely believe this is how every company in today's world should operate and care for their employees. The balance of freedom and responsibility they provide fosters a culture of ownership and accountability.

SUM Digital is a truly 360 degree marketing agency! It sounds cliche to say but they can basically do it all, and do it well which is super impressive and very rare. I highly recommend them. I worked in cooperation with SUM Digital to produce B2B leads for the company I was working for and it was a very smooth, collaborative and effective campaign. Together we bought in leads across various channels and markets. They also assisted us with a whole lot of backend implementation, from Wordpress to HubSpot, Meta and more. Amiël, Val and Diederik are really great guys and very good at what they do. I would not hesitate to use them again in the future.

We had a great experience working with SUM, first to implement Hubspot and now to scale up our Marketing. It's rare to find partners that can advise you strategically and, at the same time, get the work done. SUM provided us a very good combination of both and made us feel we have a partner we can trust on our side!

SUM Digital helped us start our travel agency in Chiang Mai in 2017. They built a beautiful, easy-to-use website and fine-tuned our Google Ads and Facebook marketing campaigns to help us grow into the successful travel business we are today. Seven years, and a lot of growth later, we are still working together with incredible results!

Thank you so much,

Pim and Miki - PM Tours

SUM Digital is our partner in Growth. They are action orientated which is what we need to scale quickly but also be ble to change direction

Knowledgeable, passionate and in general a great team to work with

SUM helped us gain control over our (complex) marketing infrastructure and learned us how to use seo, sea and email marketing. I really enjoyed our regular online meetings where they'd always share interesting insights, help us understand what was happening and showed us opportunities. They're great people too; smart, professional, and fun to work with. Would hire them again when the right job comes up.

We operate in the B2B market niche, our machines go to customers all over the world. After changes in our sales approach, the hunt began for a partner to assist us with scaling our sales and marketing activities in order to grow our business. SUM brought us on a journey of discovery in how to structure, scale and integrate our marketing activities, exploring systematically which approaches and tools worked best for us. Their professionalism, positivity and arsenal of tools is formidable. Thank you, SUM!

We’re selling industrial niche products to multinational companies worldwide - looking for a (online) marketing partner was a process of continuous disappointment. Until we met Jurre and Diederik of SUM Digital back in 2018. Since then we more than doubled our sales to 90 countries on 5 continents with their spot-on marketing. Thanks guys!