Customer.io sends targeted messages across email, SMS, and push notifications triggered by user behaviour and product data for SaaS companies.
Customer.io automates lifecycle messaging across email, SMS, and push based on product usage data and customer behaviour for product-led companies.
You need messaging tied directly to product behaviour, not just email opens and clicks, and want sophisticated segmentation based on what users actually do in-app.
€
1200
/ year
€
100
/ month
Sending onboarding emails based on product usage
Triggering upgrade prompts when usage hits limits
Re-engaging inactive users with targeted campaigns
SaaS companies automating onboarding, product-led growth teams improving activation, B2C apps engaging users based on in-app behaviour patterns.
Looking for other options? These are tools I've personally used with clients or tested extensively. Some might better suit your budget, tech stack, or team size. Consider this a shortlist if you need alternatives.
ActiveCampaign combines email marketing, CRM, and marketing automation with sophisticated workflows and lead scoring for B2B companies.
Brevo provides email marketing, SMS campaigns, and marketing automation with transactional email capabilities for growing businesses.
All in one CRM with marketing, sales and service, strong when you want one system that teams adopt.
Klaviyo provides email and SMS marketing built specifically for e-commerce with deep Shopify integration and revenue attribution.
Mailchimp provides email marketing with automation, landing pages, and basic CRM features designed for small businesses and beginners.
Tools like Zapier, n8n and Make.com are incredibly powerful, but they can feel overwhelming when you’re just getting started. Since you can connect almost anything, it’s hard to know where to begin.
No-code automation connecting 5,000+ apps to move data and trigger actions excellent for quick wins when you need integrations that just work.
Open-source automation with self-hosting ideal when you need complete control, want to own infrastructure, or have technical teams building workflows.
Visual automation platform with advanced logic and error handling more powerful than Zapier when you need control over complex, branching workflows.
Customer.io is the product-first messaging platform built for companies where product usage data drives communication strategy. The event-based triggers are more sophisticated than traditional email tools. The segmentation based on product behaviour is powerful. The A/B testing is solid. The deliverability is strong. Pricing is custom but expect several hundred pounds monthly minimum. Compare against: Intercom for more comprehensive product messaging, Braze for enterprise mobile-first, or ActiveCampaign if product data integration isn't critical. Choose Customer.io when your messaging strategy relies on product usage data, not just email engagement. The implementation requires developer resources to instrument events properly. Best for SaaS and product-led companies where lifecycle messaging tied to product behaviour drives retention and expansion.
My personal notes on how to use this tool.
This tool is part of tactical playbooks that walk you through every stage of this engine. Read the full guides to learn how to implement the framework, set up your infrastructure, and execute the tactics that drive results.
Your best leads go cold because you're not in their inbox when they're ready to buy. Nurture sequences solve the timing problem. Stay top of mind with automated follow-up that delivers value, handles objections, and keeps momentum alive between meetings, proposals, and decisions.
See playbook
Webflow builds custom websites visually without code, offering designer control, CMS capabilities, and hosting for professional web projects.
ActiveCampaign combines email marketing, CRM, and marketing automation with sophisticated workflows and lead scoring for B2B companies.
Outgrow creates calculators, quizzes, and assessments to engage visitors, capture leads, and personalise recommendations on websites.
Microsoft Clarity provides free session recordings, heatmaps, and user behaviour analytics without traffic limits or time restrictions.
Instapage builds post-click landing pages with A/B testing, personalisation, and collaboration features for paid advertising campaigns.
Email and automation aimed at ecommerce, can work for simple B2B funnels that need easy flows and segmentation.
