★ ★ ★ ★ ★ 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

Conversion-focused TikTok ads for Dutch brands

Amsterdam, Netherlands · TikTok Ads with creative testing systems

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G2 G2 4.9 (41) Clutch Clutch 4.8 (26) Google Google Reviews 4.9 (34)
Categories: Paid ads agencies E-commerce specialists
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

Case studies

Real client engagements with measurable outcomes.

Dutch activewear brand: 2.1x to 5.3x ROAS in 12 weeks via creative volume

Activewear / DTC

Client: 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 subscription

Client: 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 / DTC

Client: 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.

Meet the team

The people who'll be running your account. Names with are Inflowave-verified.

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.

LinkedIn
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.

LinkedIn
TB

Tomas Bakker

Content Strategist · 7y exp

Owns the editorial calendar and LinkedIn ghostwriting for Cobalt's B2B clients. Former tech journalist.

LinkedIn

Qualifications & certifications

TikTok

TikTok Marketing Partner

TikTok · 2024

Meta

Meta Business Partner

Meta · 2024

Shopify

Shopify Plus Partner

Shopify · 2025

Inflowave

Inflowave Verified Agency

Inflowave · 2026

Notable clients

  • Polder Athletics
  • Tulp Tea Co.
  • Vondel Skincare
  • Boomgaard Snacks
  • Kanaal Coffee Roasters

Want to work with Cobalt Labs?

Reach out directly at hello@example-cobaltlabs.com or visit their website to start a conversation.

Visit Cobalt Labs →