All Live Klaviyo Sites List
Klaviyo has approximately 150,000 customers — predominantly e-commerce businesses using Shopify, WooCommerce, or Magento. Klaviyo is the dominant email and SMS marketing platform for mid-market e-commerce (merchants doing $500K-$50M in revenue).
Klaviyo — Market Intelligence
Klaviyo users are high-value e-commerce targets. Ideal products: e-commerce conversion rate optimisation (CRO) tools, loyalty and referral programmes, subscription box management, returns management platforms, 3PL and fulfilment services, and e-commerce accounting software. Klaviyo merchants are sophisticated and revenue-focused — they respond to ROI-specific pitches.
E-commerce Directors, Heads of Retention, and Marketing Managers control Klaviyo and adjacent tool purchasing. At smaller Shopify brands, the founder makes all decisions directly.
Platform Facts
- ▸ 150,000+ Klaviyo customers globally
- ▸ Klaviyo's IPO in 2023 valued the company at $9.2 billion
- ▸ Average Klaviyo e-commerce customer generates $1-10M in annual revenue
- ▸ Klaviyo drives 67%+ of its new customers through the Shopify App Store
Klaviyo Sites by Region
Site Traffic Tiers
| Monthly Traffic | % of Sites |
|---|---|
| High Traffic (>100K/mo) | 8% |
| Medium Traffic (10K–100K/mo) | 28% |
| Low/New (<10K/mo) | 64% |
What Is the All Live Klaviyo Sites List?
The All Live Klaviyo Sites List is a database of 380,086+ websites confirmed to be actively using Klaviyo. Compiled using BuiltWith technology intelligence, it provides direct access to website owners and administrators who are already users of the Klaviyo platform.
Unlike broad contact databases, this list is qualified by technology signal — making it uniquely relevant for companies selling complementary products, apps, themes, or services to Klaviyo users.
36% of listed sites are US-based. Email accuracy is 95%+, last verified Q3 2026.
What's Included
| Field | Status |
|---|---|
| Website URL | ✓ Verified |
| Owner/Admin Email | ✓ Included |
| Business Name | Where Available |
| Contact Name | Where Available |
| Country | ✓ Included |
| Traffic Tier | ✓ Estimated |
| Technology Confirmed | ✓ Klaviyo |
Who Uses This Database
Plugin & App Developers
Sell Klaviyo plugins, apps, and extensions to 380K+ active Klaviyo site owners directly.
Theme & Design Vendors
Reach Klaviyo website owners for theme sales, design services, and visual optimisation tools.
SaaS & Software
Sell complementary SaaS tools — analytics, marketing, CRM, automation — to Klaviyo users.
Agency Services
Offer SEO, PPC, and digital marketing services to 380K+ Klaviyo site owners needing help.
Cold Email Outreach
Launch targeted outreach to Klaviyo website owners — a highly specific, technology-qualified audience.
Competitive Intelligence
Identify businesses using competing or complementary technologies and reach them with targeted messaging.
Tools & Guides for Klaviyo Outreach
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Download the All Live Klaviyo Sites List — 380,086+ verified websites using Klaviyo with owner contact data.