Founder stories
Email automation platform that helps businesses send targeted, behavior-triggered messages including email, push, and SMS.
How Colin acquired customers
Tools used to build Customer.io
Colin Nederkoorn started Customer.io with 5 customers paying $10/month and grew it to $70M ARR over 10 years through patient, methodical growth.
I grew up in Singapore watching my dad run an international shipping logistics company. That experience taught me patience and the value of long-term thinking.
We started with 5 customers paying $10/month. Not exactly the explosive growth you read about on TechCrunch. But we were building something sustainable.
It took us 18 months to hit $10K MRR. That felt slow at the time, but we were learning our customers deeply. Every feature was built based on real conversations.
Unlike many startups, we didn't chase hockey stick growth. We focused on product quality, customer success, and sustainable unit economics. The compound effect over a decade was massive.
Ten years later, Customer.io reached $70M ARR. We're now approaching $100M. The same principles that got us our first 5 customers still guide us today.
Slow early growth doesn't mean you won't build something big
Deep customer understanding compounds over time
Patient capital and long-term thinking beat quick exits
The journey from $10/month to $70M ARR takes a decade of focus
Inspired by Colin's journey? Generate a business idea in the Marketing space using AI and real founder data.
Colin achieved 3 milestones on the path to $100K ARR
$10,000
$120,000
The journey, decisions, and context behind this milestone
See the complete breakdown: launch strategy, validation methods, startup costs, expert analysis, replication playbook, and more actionable insights.
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