Sd
Sander de Vries
Founder & Head of Growth · 11y exp
Built Cobalt after leading growth at two Amsterdam fintechs. Focuses on data-led organic and paid social for European tech.
★ ★ ★ ★ ★ What clients say
"Cobalt is the only agency that ever showed us a real attribution model. Our CAC dropped 32 percent inside two quarters."
Lukas Hendriks
CMO, Trendline Banking
"They run growth like an in-house team would. Numbers first, opinions second."
Anouk de Wit
Founder, Pacework SaaS
"We have referred Cobalt to four other Amsterdam founders. Every one of them stayed for over a year."
Bram Visser
CEO, Notabene Tools
CL
Cobalt Labs — TikTok Marketing Agency in Amsterdam
Conversion-focused TikTok ads for Dutch brands
Amsterdam, Netherlands · TikTok Ads with creative testing systems
28+
Clients served
2
Years active
4.7x
Average ROI
EUR 14M+ tracked
Revenue generated
78k+ purchases
Leads delivered
13
Active retainers
About Cobalt Labs
Cobalt Labs runs systematic creative tests at scale on TikTok. Their teams ship 30+ creative concepts per week per client and let the platform algorithm pick winners faster than manual selection ever could.
What sets them apart
Cobalt's whole operation is built around one belief: on TikTok, creative volume beats creative polish. They ship 30-40 concept variants per client per week through a structured 4-axis test grid (hook angle, format, talent type, offer framing), then prune ruthlessly using TikTok's Creative Center 3-second view-through and 6-second hold benchmarks. Their pixel architecture is unusually precise for the Dutch market, with deduplicated CAPI events and post-iOS modeling that lets them keep scaling when others lose attribution. Most clients are Dutch DTC brands hitting EUR 200k-2M MRR who have outgrown 1-3 manual variants per month.
Industries served
- DTC
- Subscription
- Apparel
Services
- TikTok Ads
- Creative testing
- Spark Ads
- Pixel architecture
Meet the team
The people who'll be running your account. Names with are Inflowave-verified.
EJ
Eva Janssen
Lead Analyst · 9y exp
Builds the attribution and reporting layer behind every Cobalt account. Background in product analytics at a Dutch SaaS unicorn.
TB
Tomas Bakker
Content Strategist · 7y exp
Owns the editorial calendar and LinkedIn ghostwriting for Cobalt's B2B clients. Former tech journalist.
Qualifications & certifications
TikTok Marketing Partner
TikTok · 2024
Meta Business Partner
Meta · 2024
Shopify Plus Partner
Shopify · 2025
Inflowave Verified Agency
Inflowave · 2026
Notable clients
- P Polder Athletics
- T Tulp Tea Co.
- V Vondel Skincare
- B Boomgaard Snacks
- K Kanaal Coffee Roasters
Case studies
Real client engagements with measurable outcomes — swipe or use the arrows.
Dutch activewear brand: 2.1x to 5.3x ROAS in 12 weeks via creative volume
Activewear / DTCClient: Polder Athletics
+152% ROAS
-38% CPM
2.4x ad spend
Challenge
A Dutch activewear brand was running 4 TikTok ad variants on a EUR 60k/month budget. CPMs had climbed to EUR 14, ROAS sat at 2.1x, and the in-house team could not produce more than 4 fresh assets monthly.
Approach
Cobalt deployed a 32-variant per week creative cell across 4 hook angles (problem-aware, athlete-led, before/after, fabric-tech). Built a TikTok-native test grid that killed any concept under 18% 3-second VTR after EUR 200 spend. Scaled only the top decile via Spark Ads with creator whitelisting.
Result
ROAS grew from 2.1x to 5.3x over 12 weeks. CPMs fell 38% as algorithm rewarded creative diversity. Brand 2.4x-d budget while improving margin per order.
Subscription tea brand: EUR 80k to EUR 410k MRR on TikTok-only stack
F&B subscriptionClient: Tulp Tea Co.
5.1x MRR growth
EUR 18 CAC
64% channel mix
Challenge
A Dutch tea subscription was growing slowly on Meta and had never tested TikTok seriously. Founder believed the audience was wrong for the platform.
Approach
Built a TikTok-native creative system with 28 weekly variants emphasizing the ritual angle (morning routines, cosy moments) over product specs. Layered a flavor-quiz funnel with deduplicated CAPI tracking. Tested 5 offer structures and locked in a free-sampler entry point.
Result
MRR grew from EUR 80k to EUR 410k in 9 months. TikTok now drives 64% of new subscribers at a EUR 18 CAC vs EUR 41 on Meta. Churn fell because quiz-matched first boxes had higher satisfaction.
Skincare DTC: cut creative production cost 56% while doubling output
Skincare / DTCClient: Vondel Skincare
12x output
-56% cost
stable 3.6x ROAS
Challenge
A premium Dutch skincare brand was paying EUR 28k/month to a studio for 8 polished ad variants. Performance was solid (3.4x ROAS) but volume was the ceiling and per-variant cost was crippling unit economics.
Approach
Replaced studio with a 22-creator UGC roster shooting in real bathrooms. Built a brief library of 40 hook structures tagged by skin concern. Shipped 24 variants per week with same-week turnaround instead of 8 every 4 weeks.
Result
Output rose from 8 to 96 variants/month. Production cost fell 56% to EUR 12.3k. ROAS held at 3.6x with much lower creative-fatigue risk going into Q4.
Frequently asked questions
How much does a tiktok marketing agency in Amsterdam cost? +
Cobalt Labs works on a performance retainer (eur 6k-18k/mo + 4-8% revenue share above target) model. Most tiktok marketing engagements in Amsterdam run as monthly retainers — request a quote for exact numbers based on your goals.
What does Cobalt Labs specialize in? +
Cobalt Labs is a Amsterdam, Netherlands agency specializing in TikTok Ads with creative testing systems. They serve DTC, Subscription, Apparel.
Is Cobalt Labs a good fit for my business? +
Cobalt Labs works best with DTC, Subscription, Apparel brands and has served 28+ clients. If you need tiktok ads, creative testing, spark ads, they're worth a conversation.
How is Cobalt Labs vetted? +
Every partner agency in the Inflowave directory is verified before listing. We confirm the business, its services, and its track record.
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