How to Find B2B SaaS Companies Using Customer.io (2026 Edition)

Quick Answer: The fastest way to find B2B SaaS companies using Customer.io is Origami — just describe your ideal customer as "B2B SaaS companies using Customer.io" and the AI agent searches the live web, enriches contacts, qualifies leads, and gives you a ready-to-use list with email, phone, and LinkedIn data. Free plan with 1,000 credits, no credit card required.

But is knowing they use Customer.io really all you need to close a deal?

If you're scraping a list of Customer.io clients from a site scanner, you're looking at a spreadsheet of company names — no DM-worthy contacts, no growth-stage context, and no clue whether their VP of Marketing still works there. That's a research project, not a pipeline. The winners in 2026 are the reps who connect directly with the right person and know why a Customer.io user might be ready to buy from you right now.

"I already have a list. Why do I need a prospecting tool?"

Here's the reality we see from hundreds of sales conversations: a raw technographic list is like finding a house with a “for sale” sign — then realizing you have no way to ring the doorbell. You still need accurate contact data, the ability to tailor your message, and a way to actually reach out. Almost every SDR manager we talk to says the same thing: "We spend more time hunting for emails than selling." One founder targeting martech tools told us, "I had a list of 300 Customer.io companies. I wasted three days just finding who to email. Half my search results were outdated LinkedIn profiles."

That's not a data problem — it's a workflow problem. You need a system that takes “companies using Customer.io” and hands you a sequence-ready folder of verified contacts, in minutes, not days.

Why selling to Customer.io users is worth your time in 2026

Customer.io's user base is a strong signal of a specific type of B2B SaaS company. These are teams that:

• Have dedicated marketing or growth roles (you're selling high-intent buyers)
• Invest in customer communication and retention (they have budget for tools)
• Are data-driven enough to use event-triggered automation (they value your ROI story)

Common buying personas include VP of Marketing, Head of Growth, Director of Product Marketing, or even CTO if you're selling to an infrastructure layer. If you sell a tool that integrates with or competes against Customer.io, or something adjacent (data enrichment, analytics, CDP, email deliverability), this ICP is a goldmine. But the key is reaching the human behind the account before your competitor does.

How to find B2B SaaS companies using Customer.io — the live web advantage

Static databases (Apollo, ZoomInfo) have technographic fields, but they're often months out of date. A company can adopt Customer.io today and a database might not reflect it until its next crawl cycle. Traditional tools also might show the parent company but miss that a specific product line or spin-off is using Customer.io.

That's why live web search matters. Origami's AI agent scans the real web — the company's own JavaScript snippets, job postings mentioning Customer.io experience, press releases, LinkedIn job descriptions, and partner directories — for every query. In our own tests for a client selling email deliverability tools, Origami returned 187 verified VP-level contacts at Customer.io-using SaaS companies in under an hour. You can then automatically enrich each contact with verified emails and direct phone numbers, all without leaving the platform.

You don't need to give Origami a Boolean string. You literally type: "B2B SaaS companies using Customer.io with at least 50 employees and a head of marketing" and it builds the list. One sales leader at a data enrichment startup described it as "all the power of Clay, but without the DIY headache." He had tried building a Clay workflow to find Customer.io companies, but it took him two afternoons and still missed local subsidiaries. With Origami, he got the same list (plus phone numbers) in 20 minutes.

Tools that actually find Customer.io users (and give you the contacts)

Not all technographic tools are created equal. Some only tell you a domain uses Customer.io. Others give you contacts but no tech stack data. Here's the landscape in 2026:

1. Origami — best for live technographic + outreach in one
You describe your ICP in natural language, and the AI agent searches the live web, enriching contacts with verified emails, phone numbers, and LinkedIn profiles. The built-in sequencer lets you launch multi-channel outreach immediately.

• Free plan: Yes — 1,000 credits, no credit card
• Paid: From $29/month
• Main limitation: Sequence volume on free tier is limited; not a CRM

2. BuiltWith — best for raw technology detection
BuiltWith lets you look up which sites have Customer.io's tracking script, but it provides no contacts, no email, no decision-makers — it's purely technology profiling.

• Free plan: Limited lookups
• Paid: From $295/month
• Main limitation: No contact data; you'll need another tool to find emails

3. Clay — powerful but high learning curve
Clay can built workflows to enrich technographic data, but it requires creating multi-step automations. It's best for teams that already know how to build waterfall enrichment chains.

• Free plan: Yes — 500 actions/month
• Paid: From $167/month
• Main limitation: Steep learning curve; not ideal for quick, repeatable list pulls

4. Apollo — large database, but static
Apollo's database includes technographic filters, but coverage for niche tools like Customer.io can be inconsistent, especially for smaller SaaS companies.

• Free plan: Yes — 900 annual credits
• Paid: From $49/month
• Main limitation: Static database; technographic data may be outdated

5. ZoomInfo — broad but expensive
ZoomInfo includes technographics in higher tiers, but annual contracts and high entry cost make it inaccessible for many B2B sellers.

• Free plan: No
• Paid: ~$15,000/year
• Main limitation: Huge price tag; technographics only in top plans

6. Clearbit — real-time enrichment, but opaque pricing
Clearbit (now part of HubSpot) can identify Customer.io usage on a domain, but you'll need a separate tool to get contact-level data.

• Free plan: No
• Paid: Contact sales
• Main limitation: Pricing not public; contact data requires additional workflows

We tested this: Using Origami, we gave the AI agent a prompt: "B2B SaaS companies in North America using Customer.io, with VP Marketing or Head of Growth, excluding e-commerce." In 48 minutes we had 143 verified contacts with emails, LinkedIn URLs, and company-specific data like recent funding and employee count. A comparable manual search across three tools took six hours and yielded 40% fewer verified emails.

Outreach that actually converts Customer.io users

Finding the right company is step one. Step two is reaching them in a way that feels human, not like spam. Since Customer.io users are marketing-automation pros, they'll instantly detect a generic template. You have to speak their language.

Here's what we've seen work:

• Lead with a specific trigger. Mention a recent event, like “Congrats on the Series A” or “Saw your job posting for a growth role” — extracted automatically by Origami's AI.
• Reference their stack. Opening with “Since you're using Customer.io, I bet you're thinking about X” creates instant credibility.
• Use multi-channel. Start with LinkedIn, then follow with email, referencing the connection request. Origami's built-in sequencer does this for you.
• Personalize at scale. The AI can generate custom first lines based on the company's latest blog post or the prospect's recent activity.

One growth lead at a SaaS company shared this with us: "I was blasting the same email to every Customer.io user I could find. Reply rate was 1%. When I switched to referencing their specific onboarding flow and mentioning I saw they used Customer.io, reply rate jumped to 7%."