Customer.io
Behavior-based email and push for SaaS
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From $100/mo
Customer.io sends messages based on what users actually do in your product. Founded by Colin Nederkoorn, “fundstrapped” (took some money but runs like bootstrapped). Took 18 months to hit $10k MRR, now at $100M ARR. Great for SaaS doing product-led growth.
What's good
- Powerful segmentation
- Multi-channel (email, SMS, push)
- Great for product-led growth
Watch out for
- Expensive for small lists
- Steep learning curve