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Platinum Solutions Partner

SUM Digital

Remote
Contact business
Services we provide
  • Account based marketing
  • Conversational Marketing
  • CRM Implementation
  • CRM Migration
  • Customer Marketing
  • Email Marketing
  • Full Inbound Marketing Services
  • Help Desk Implementation
  • HubSpot Onboarding
  • Paid Advertising
  • Sales and Marketing Alignment
  • Sales Enablement
  • Search Engine Optimization
  • Social Media
  • Website Design
  • Website Development
  • Website Migration
Industries we specialize in
  • Banking/financial services
  • Consulting/advisory
  • Legal services
  • Real estate
  • Technology - software
Budgets we work with
    Any budget
Languages we support
  • English
  • Dutch
Regions we serve
  • EMEA

About SUM Digital

Welcome to SUM! From Amsterdam to everywhere. We're a 100% remote Growth Agency, bringing Dutch innovation to you, wherever you are! As proud partners with HubSpot, we're all about taking your business to new heights. 👉 What we believe? Growth is more than just getting bigger; it's about getting smarter and better. At SUM, we think differently. We know each business is unique, so we tailor our approach to fit you just right. 👉 Our team? Our team is a mix of smart strategists, creative minds, and tech whizzes. We work from all over, but we share one goal – to help your business grow in the best way possible. 👉 What we do? Using HubSpot's awesome tools, we offer services that are just right for your business. Whether you're in the thick of scaling up or actively expanding, we've got a team ready with the best tools and plans that really work. We focus on real results, not just talk. Think your business has what it takes to grow smarter and stronger? Let's prove it together 📞

Client Reviews for SUM Digital

Average rating

5.0

Based on 13 ratings

Total reviews

13

Number of reviews all-time

Overall rating

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13 Reviews


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5/5
  • Jun 23, 2025

Comprehensive onboarding

If as a company you want to start managing your entire marketing from HubSpot and you haven't worked with it yet, a good onboarding is important. The onboarding with SUM Digital is then a good choice, Through different projects you can go through different marketing tools at your own pace and you will learn what options are available. In addition, SUM is always ready to answer your questions or solve problems you run into. Thanks for all the help and valuable insights.

Services providedHubSpot Onboarding

Comprehensive onboarding

If as a company you want to start managing your entire marketing from HubSpot and you haven't worked with it yet, a good onboarding is important. The onboarding with SUM Digital is then a good choice, Through different projects you can go through different marketing tools at your own pace and you will learn what options are available. In addition, SUM is always ready to answer your questions or solve problems you run into. Thanks for all the help and valuable insights.

Services providedHubSpot Onboarding
  • van den Doel, M.

Translated from Nederlands. View original text
5/5
  • Jun 10, 2025

Top!

For our company, onboarding HubSpot was a challenge, especially since we needed a complex pipeline. SUM, did a fantastic job helping us with this. The staff at SUM took all the time to answer our questions and explained everything clearly. Boudewijn's expertise was nice and without his knowledge of the system, we really wouldn't have been able to pull this off on our own. What we especially appreciated were the efficient videos he sent. These were built step by step, so we knew exactly what to do. Moreover, they are super handy to watch back later if something is no longer completely clear. The cooperation with SUM and Boudewijn was not only professional, but also very pleasant. We definitely recommend them for anyone who wants to set up HubSpot, especially when it comes to complex processes!

Services providedHubSpot Onboarding

Top!

For our company, onboarding HubSpot was a challenge, especially since we needed a complex pipeline. SUM, did a fantastic job helping us with this. The staff at SUM took all the time to answer our questions and explained everything clearly. Boudewijn's expertise was nice and without his knowledge of the system, we really wouldn't have been able to pull this off on our own. What we especially appreciated were the efficient videos he sent. These were built step by step, so we knew exactly what to do. Moreover, they are super handy to watch back later if something is no longer completely clear. The cooperation with SUM and Boudewijn was not only professional, but also very pleasant. We definitely recommend them for anyone who wants to set up HubSpot, especially when it comes to complex processes!

Services providedHubSpot Onboarding
  • van Bemmel, P.

Translated from Nederlands. View original text
5/5
  • Apr 2, 2025

Smooth onboarding with real impact (Sales Professional)

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.

Services providedHubSpot Onboarding

Smooth onboarding with real impact (Sales Professional)

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.

Services providedHubSpot Onboarding
  • Cappelle, A.

5/5
  • Sep 24, 2024

Experts, personalized, and results-driven!

Working with Sum Digital has been a great experience! They’re true experts who know exactly what they’re doing, with a structured yet flexible approach that fits our company’s core business and audience. What I appreciated most is how they think with you and always ready to optimize and get the absolute best for their customers. Highly recommend them if you want a team that’s proactive, knowledgeable, and genuinely committed to your success!

Services providedCRM Implementation, Email Marketing, and HubSpot Onboarding

Experts, personalized, and results-driven!

Working with Sum Digital has been a great experience! They’re true experts who know exactly what they’re doing, with a structured yet flexible approach that fits our company’s core business and audience. What I appreciated most is how they think with you and always ready to optimize and get the absolute best for their customers. Highly recommend them if you want a team that’s proactive, knowledgeable, and genuinely committed to your success!

Services providedCRM Implementation, Email Marketing, and HubSpot Onboarding
  • Latrech, H.

  • Hospitality
  • 26 to 50 employees
5/5
  • Sep 11, 2024

HubSpot-onboarding in uitstekende handen bij SUM

SUM heeft ons geholpen bij HubSpot (sales hub) integratie. Boudewijn was geïnteresseerd, vroeg door naar de kern van ons probleem en was daarmee actief opzoek naar de vraag achter de vraag. Hierdoor konden wij zelf ook beter nadenken over onze processen en deze verbeteren of HubSpot aanpassen met een naadloze integratie als resultaat. Verder werd een duidelijke projectplanning bijgehouden en SUM is een partner die goed meedenkt in wat ons bedrijf nodig heeft zonder hierbij een eigen wil op het project te drukken of opdringerige sales technieken te gebruiken. Ik zou SUM zeker aanbevelen voor een HubSpot onboarding!

Services providedHubSpot Onboarding

HubSpot-onboarding in uitstekende handen bij SUM

SUM heeft ons geholpen bij HubSpot (sales hub) integratie. Boudewijn was geïnteresseerd, vroeg door naar de kern van ons probleem en was daarmee actief opzoek naar de vraag achter de vraag. Hierdoor konden wij zelf ook beter nadenken over onze processen en deze verbeteren of HubSpot aanpassen met een naadloze integratie als resultaat. Verder werd een duidelijke projectplanning bijgehouden en SUM is een partner die goed meedenkt in wat ons bedrijf nodig heeft zonder hierbij een eigen wil op het project te drukken of opdringerige sales technieken te gebruiken. Ik zou SUM zeker aanbevelen voor een HubSpot onboarding!

Services providedHubSpot Onboarding
  • Willems, D.

  • 6 to 10 employees
5/5
  • Jul 18, 2024

HubSpot implementation and training

We had a great experience working with SUM Digital on our HubSpot implementation. They were always very clear on the scope of work, the objectives and the next steps to get there. On top of that, they really get things done quickly and surpass expectations! If you are looking for a trusted partner that can advise strategically but also do the work professionally, look no further! We were so happy with them that we also chose them as our marketing partners

Services providedCRM Implementation, Customer Marketing, and HubSpot Onboarding

HubSpot implementation and training

We had a great experience working with SUM Digital on our HubSpot implementation. They were always very clear on the scope of work, the objectives and the next steps to get there. On top of that, they really get things done quickly and surpass expectations! If you are looking for a trusted partner that can advise strategically but also do the work professionally, look no further! We were so happy with them that we also chose them as our marketing partners

Services providedCRM Implementation, Customer Marketing, and HubSpot Onboarding
  • Redolfi, F.

  • Consulting/Advisory
  • 6 to 10 employees
5/5
  • Jul 10, 2024

Great experience working with SUM

I guess there will not be much more to say if I say my experience working with SUM (Bouwdewijn) could have not been better. Since day he showed a tremendous level of knowledge and was always able to guide us through the process. For me, trying to understand and use the platform it was more than an implementation but a couple of lessons where I learned what there is to do and how things are/ should be done. Now everything is in place and we are ready to move on, knowing they are there in case we need some more help. thanks SUM...Thanks Bouwdewijn!!!!

Services providedFull Inbound Marketing Services

Great experience working with SUM

I guess there will not be much more to say if I say my experience working with SUM (Bouwdewijn) could have not been better. Since day he showed a tremendous level of knowledge and was always able to guide us through the process. For me, trying to understand and use the platform it was more than an implementation but a couple of lessons where I learned what there is to do and how things are/ should be done. Now everything is in place and we are ready to move on, knowing they are there in case we need some more help. thanks SUM...Thanks Bouwdewijn!!!!

Services providedFull Inbound Marketing Services
  • Alvarez, D.

  • Telecom & Mobile Communications
  • 26 to 50 employees
5/5
  • Feb 20, 2024

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.

Services providedSocial Media, Website Design, Paid Advertising, Email Marketing, Full Inbound Marketing Services, and HubSpot Onboarding

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.

Services providedSocial Media, Website Design, Paid Advertising, Email Marketing, Full Inbound Marketing Services, and HubSpot Onboarding
  • Schmitz, J.

  • Manufacturing
  • 6 to 10 employees
5/5
  • Jan 25, 2024

SUM helped us develop and streamline our online marketing approach, with scalability the buzzword

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!

Services providedCRM Implementation, Social Media, Website Design, Paid Advertising, Sales and Marketing Alignment, Content Creation, HubSpot Onboarding, and Search Engine Optimization

SUM helped us develop and streamline our online marketing approach, with scalability the buzzword

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!

Services providedCRM Implementation, Social Media, Website Design, Paid Advertising, Sales and Marketing Alignment, Content Creation, HubSpot Onboarding, and Search Engine Optimization
  • Wientjens, O.

  • Manufacturing
  • 11 to 25 employees
5/5
  • Jan 17, 2024

Business partner die snapt wat er speelt

Vanaf het allereerste moment hebben we ervaren hoe waardevol partnerschap kan zijn. Het is verfrissend om met een bedrijf samen te werken dat niet alleen uitblinkt in professionaliteit, maar ook in het creëren van een warme en vriendelijke sfeer. Het team van SUM heeft bewezen dat partnerschap meer is dan alleen zakelijke transacties; het gaat om wederzijds begrip, respect en een gezamenlijk streven naar succes.

Services providedCRM Implementation, Website Design, Email Marketing, Customer Marketing, Website Development, and Account based marketing

Business partner die snapt wat er speelt

Vanaf het allereerste moment hebben we ervaren hoe waardevol partnerschap kan zijn. Het is verfrissend om met een bedrijf samen te werken dat niet alleen uitblinkt in professionaliteit, maar ook in het creëren van een warme en vriendelijke sfeer. Het team van SUM heeft bewezen dat partnerschap meer is dan alleen zakelijke transacties; het gaat om wederzijds begrip, respect en een gezamenlijk streven naar succes.

Services providedCRM Implementation, Website Design, Email Marketing, Customer Marketing, Website Development, and Account based marketing
  • Rottier, T.

  • Consulting/Advisory
  • 51 to 200 employees
Services we provide
  • Account based marketing
  • Conversational Marketing
  • CRM Implementation
  • CRM Migration
  • Customer Marketing
  • Email Marketing
  • Full Inbound Marketing Services
  • Help Desk Implementation
  • HubSpot Onboarding
  • Paid Advertising
  • Sales and Marketing Alignment
  • Sales Enablement
  • Search Engine Optimization
  • Social Media
  • Website Design
  • Website Development
  • Website Migration
Industries we specialize in
  • Banking/financial services
  • Consulting/advisory
  • Legal services
  • Real estate
  • Technology - software
Budgets we work with
    Any budget
Languages we support
  • English
  • Dutch
Regions we serve
  • EMEA