Klaviyo vs Constant Contact: When to Outgrow Constant Contact
Constant Contact does broadcast email well. For ecommerce, the limits show up at automation, segmentation, and reporting. An honest comparison.
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Constant Contact has been around since 1995 and has built a reputation for broadcast email and small-business simplicity. The product does what it does well. The question for ecommerce brands is whether what it does is what you need.
This is an honest breakdown of where Constant Contact fits, where it stops fitting, and what changes when an ecommerce brand moves to Klaviyo.
Constant Contact Is Built for Broadcast; Klaviyo Is Built for Behaviour
The architectural difference is significant. Constant Contact treats email as a broadcast channel: you build a list, design an email, send it. The product has automation features but they’re bolted onto a broadcast-first foundation.
Klaviyo treats email as a behavioural channel: every contact is a profile with full event history (purchases, page views, cart events, predicted properties), and email/SMS is one expression of how you interact with that profile.
For ecommerce specifically, this difference matters because most email revenue comes from behavioural triggers, not broadcasts. Welcome series after signup. Abandoned cart after checkout abandonment. Post-purchase based on order date. Replenishment based on consumption cycles. Browse abandonment based on product views. None of these work properly in a broadcast-first architecture.
Pricing
Constant Contact prices on contacts: $35-95/month for the Standard tier (depending on contact count and features). Lite plan starts at $12/month for very small lists.
Klaviyo prices on active profiles you actually email: free up to 250 profiles, then scaling with list size. At 5,000 profiles Klaviyo runs about $100/month; at 25,000 about $400/month.
For most ecommerce lists, Klaviyo is similarly priced to Constant Contact’s mid-tier and includes meaningfully more functionality at the same cost.
Where Constant Contact Wins
Simplicity for non-technical users. The interface is straightforward, support is responsive, and the learning curve is minimal. For small businesses or solopreneurs running broadcast email a few times per month, Constant Contact’s UX advantage is real.
Event marketing tools. Constant Contact has dedicated tools for event invitations, registration, and follow-up that Klaviyo doesn’t have native equivalents for. For brands where in-person events are core to their marketing, Constant Contact’s event tooling is genuinely useful.
Local-business and B2B-light fit. Constant Contact is designed for small businesses generally, not ecommerce specifically. Restaurants, real estate agents, professional services, and similar businesses where the marketing motion is “broadcast updates to my list” find Constant Contact a comfortable fit.
Where Klaviyo Wins for Ecommerce
Native ecommerce platform integration. Klaviyo connects to Shopify, BigCommerce, WooCommerce, and major ecommerce platforms with deep bidirectional data sync. Order history, product catalogue, customer data, cart events, all flow into Klaviyo natively. Constant Contact integrates with these platforms but at a basic level: contact and order sync, no behavioural event triggers, no product catalogue for dynamic blocks.
Behavioural automation. Klaviyo’s flow library, welcome, abandoned cart, browse abandonment, post-purchase, replenishment, win-back, back-in-stock, is built around ecommerce customer lifecycles. Constant Contact’s automations exist but are limited to autoresponders triggered by basic events like signup or birthday.
Segmentation depth. Klaviyo segments on real-time behaviour, predictive properties, and combination logic that Constant Contact’s tag-based segmentation cannot replicate. The compounding effect on revenue per recipient is significant.
Predictive analytics. Predicted CLV, predicted churn, predicted next-order-date, all native to Klaviyo, none in Constant Contact.
A/B testing and optimisation. Klaviyo includes A/B testing, smart send time, and optimisation features built around ecommerce KPIs. Constant Contact has basic split testing but lacks the depth needed for systematic optimisation.
Reporting that maps to revenue. Klaviyo reports revenue per recipient, attributed orders, flow contribution, and segment-level performance. Constant Contact reports opens, clicks, and basic engagement, useful but doesn’t surface the metrics ecommerce brands need for resource allocation.
When to Stay on Constant Contact
Three scenarios where Constant Contact is the right choice:
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Non-ecommerce small business. Restaurants, professional services, B2B-light, event-driven businesses. The broadcast-first architecture fits these use cases well.
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Very small ecommerce lists with simple email needs. Under 1,000 active subscribers, no automation, weekly broadcasts. Constant Contact handles this cleanly and the migration cost outweighs the upgrade benefit.
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Events are your primary marketing channel. If you run regular in-person events, Constant Contact’s event tools genuinely help in ways Klaviyo cannot replicate.
For everyone else running ecommerce: the architecture mismatch shows up as you grow, and the cost of staying compounds over time.
When to Migrate to Klaviyo
Migrate when:
- You’re past 1,000 active subscribers and growing
- Email is contributing less than 20% of revenue and you suspect there’s more to capture
- You want to run abandoned cart, post-purchase, replenishment, or other behavioural flows that Constant Contact can’t properly support
- You’re spending real money on paid acquisition and want email retention to compound that investment
- Your reporting in Constant Contact doesn’t tell you what email is actually contributing to revenue
The migration is straightforward: 2-3 weeks for most accounts, with the work being template rebuild, automation rebuild, contact import, and authentication setup. We’ve covered the migration in detail on our Constant Contact to Klaviyo migration page.
Pricing Comparison at Scale
| Active subscribers | Constant Contact monthly | Klaviyo monthly |
|---|---|---|
| 1,000 | ~$45 | ~$30 |
| 5,000 | ~$80 | ~$100 |
| 10,000 | ~$110 | ~$150 |
| 25,000 | ~$215 | ~$400 |
| 50,000 | ~$330 | ~$720 |
Pricing crosses around 5,000-10,000 subscribers, with Klaviyo more expensive at higher list sizes. The justification for Klaviyo’s higher cost is the meaningfully greater revenue per subscriber it enables. For ecommerce brands at $500K+ revenue, Klaviyo typically pays back the cost difference within 90 days.
Practical Recommendation
For ecommerce brands at any meaningful scale: Klaviyo wins decisively. The behavioural architecture, native integrations, and ecommerce-specific reporting close gaps that Constant Contact’s broadcast-first design wasn’t built to fill.
For non-ecommerce small business or event-driven marketing: Constant Contact stays. It’s a good fit for what it’s designed for.
The transition point usually comes around the time a brand starts taking ecommerce email seriously as a revenue channel rather than a notification channel. At that point, Constant Contact’s architecture starts producing diminishing returns regardless of how well the team uses it. Migrating to Klaviyo is the structural answer.
If you’re on Constant Contact and wondering whether to migrate, book a free audit. We’ll review your current account and tell you honestly whether the migration is worth it for your specific situation.