Growth marketing
Looking for a growth marketing agency that doesn't bet on one big idea but builds growth systematically? We set up a data-driven growth engine across your whole funnel and scale what works.
Tanguy De Keyzer Founder & digital strategist Last updated: 28 September 2026
Trusted by growing brands
Sound familiar?
We've had agencies before, but nobody made our growth genuinely predictable.
We do a bit of everything, and yet nothing really scales.
I don't know which agency will take us beyond one-off campaigns.
We want to grow, but not gamble with our budget.
How we help
As a growth marketing agency, we start from your numbers, not gut feeling. We map your funnel, run continuous experiments and only scale what demonstrably works, so growth becomes a system instead of a coincidence.
About Customer Impact
Customer Impact is a digital marketing agency founded by Tanguy De Keyzer. For more than 10 years we have been building the growth engine of startups, scale-ups and established companies.
No isolated campaigns, but an approach that fits your bigger growth picture, with strategy and execution under one roof. A small, senior team that steers on leads and revenue instead of vanity metrics.
What we stand for:
What we do
We map your entire funnel and pinpoint where the biggest, fastest growth opportunities sit.
A continuous stream of experiments, each with a hypothesis, a measurable outcome and a lesson.
Acquisition, activation, retention and referral. The fastest win often isn't more traffic, but better activation.
One clear growth metric the whole team steers on, with transparent numbers underneath it.
Your accounts, data and learnings stay yours. No black box, but shared visibility and decisions.
We find the channels that pay off for you and put them on an accelerated path to scale.
More and more ambitious companies aren’t looking for a standalone agency for a single campaign, but a partner that makes growth predictable. That is exactly what a growth marketing agency does: it builds a data-driven growth engine across your whole funnel, instead of betting on one big idea. See also our broader growth marketing service.
A traditional agency often stops at brand awareness and one-off campaigns. A growth marketing agency looks at every step of the funnel: how you attract people, activate them, retain them and bring them back. It works from hypotheses and experiments, measures everything, and only scales what demonstrably pays off.
You can build growth in-house, but that takes a team, tools and a proven process. A specialist agency brings that immediately, plus the discipline to keep measuring and adjusting. We make that trade-off honestly with you.
Growth marketing works best for startups, scale-ups and ambitious companies that want to grow fast and predictably, and are willing to experiment instead of betting on one big campaign.
The first step is a growth audit: where are your biggest, fastest growth opportunities? We map them and build an experiment roadmap that delivers results week after week. Contact us and hear where your opportunities are within 24 hours.
The difference between a good and an average growth marketing agency isn't the number of campaigns, but the discipline to measure, learn and only scale what genuinely works.
Tanguy De Keyzer Founder of Customer Impact and digital strategist No empty promises. This is what clients say about working with Customer Impact.
“I have been working with Customer Impact for a while now and it has been a breath of fresh air from the very start. The team complements itself perfectly, so you always have someone with very extensive knowledge of specific aspects of marketing, ranging from ads to web design and strategy. The hands-on approach means you can always get started right away, and the feedback is always clear and honest. No nonsense, just facts.”
Axel D.S.
Verified review via Google
“Customer Impact built a strong new website for us and set up a lead generation approach that truly delivers results.”
Janitor Waterschoot
Verified review via Google
“They do not just execute, they also think along strategically. Real B2B specialists. Recommended!”
Jack Daly
Verified review via Google
“Sharp and fast analysis of the problem, processes and possibilities. No complicated sales talk, fast, and a first setup that works well. A bit more attention to the fine tuning. Pleasant collaboration.”
Tandarts.nl
Verified review via Google
“Smooth communication, proactive thinking and everything neatly followed up.”
Claire Farrell
Verified review via Google
“Super professional and extremely creative! They managed to adjust and respond to all of our needs numerous times. Highly recommend ❤️”
Jovana Vakic
Verified review via Google
Compare your options
| Customer Impact | Large agency | Freelancer | In-house | |
|---|---|---|---|---|
| Approach | One system across the entire funnel | Often channel by channel | Loose tactics | Depends on your team |
| Channels | SEO, paid, CRO, content and lead generation | Often a different team per channel | Usually one or two | Limited to who you hire |
| Minimum term | 3 months | Often 6 months or longer | Per assignment | Employment contract |
| Steering on | Leads, customers and revenue | Often channel metrics | Often channel metrics | Depends on goals |
| Team | Small, senior team | Changing contacts | One person | Limited to who you hire |
| Response time | Reply within 24 hours on working days | Via an account manager | Depends on availability | Immediate |
These are typical traits per type of partner, not statements about specific agencies. Growth marketing only works when strategy and execution come together: we do both.
What to expect
Week 1 to 2
We map your funnel, channels and numbers and find the biggest levers.
Week 3 to 4
We set the goals and the first experiments run within weeks.
Month 2
Every experiment has a hypothesis and a measurable result; we learn what works without burning budget.
Month 3
We put volume behind what works and cut what doesn't.
Month 4 to 6
Small wins stack up into predictable growth across the entire funnel.
Case studies
Suivo wanted to depend less on events and grow more through inbound. We developed the go-to-market, channel strategy, website and lead generation. From 2024 to 2025 the pipeline via the web rose by 142%, and 85% of the total pipeline now comes in via the web.
Fashion label A.F.Vandevorst wanted to grow online in a highly competitive fashion industry. We brought Google Ads, Facebook, website optimization, email marketing and recovering abandoned carts together in one approach. Online revenue grew by 164%, the conversion rate by 17% and 25% of revenue came from email marketing.
Read the caseGet Driven wanted to grow fast in several markets. We combined branding, a new website and conversion optimization with a booking flow in three steps. Conversion rose from 1.8% to 7.3% and bookings by 287% in 3 months.
Read the caseIn all honesty
You have surprised me in multiple ways the last few weeks.What I'm seeing today on the screen is really cool. I think this is modern growth marketing.Contact us
Briefly tell us what it is about. You get a personal reply from Tanguy or someone from the team, not a call centre.
A growth marketing agency builds a data-driven growth engine instead of one-off campaigns. It optimizes every step of your funnel, from acquisition to retention, through continuous experiments, and steers on a clear growth metric instead of vanity numbers.
That depends on your ambition, market and starting position. We work with a clear scope after an initial audit, with no surprises afterwards. We walk through how pricing is built during the free intake.
A specialist agency brings a proven experimentation process, experience across multiple channels and the discipline to measure and adjust. You build a growth engine faster than figuring it all out yourself, and without hiring a full team.
Look for an agency that starts from your numbers and goals, reports transparently, respects ownership of your own accounts and data, and talks in pipeline and revenue rather than clicks. An agency that promises hard guarantees on a fixed number of clients is usually the real red flag.
The first experiments run within weeks. Because we iterate fast, small wins compound into real, lasting growth rather than a one-off spike.
More reach, leads and conversions at significantly lower costs.
Account-based marketing and fast social ad tests in the Benelux.
Organic traffic converted 38 times better than paid: positioning, topical SEO and paid in one growth engine.