Constant Contact vs Klaviyo
Side-by-side total cost of ownership: subscription fees, labor, hidden costs, and AI alternatives.
Published pricing
The subscription is only part of the cost.
| Constant Contact | Klaviyo | |
|---|---|---|
| Published rate | $12/seat/mo | $20/mo |
| Team size modeled | 5 | 5 |
| Annual subscription | $720/yr | $1,200/yr |
What the invoice doesn't show
Constant Contact
Constant Contact's pricing scales aggressively with contact count. The $12/mo Lite price is for 500 contacts. At 10,000 contacts, Lite jumps to $120/mo, Standard to $160/mo, and Premium to $300/mo. A 50,000-contact list costs $430/mo on Premium.
Lite plan limits email sends to 10x your contact count per month and blocks all automation. Even basic welcome sequences require Standard ($35/mo for 500 contacts). This means the '$12/mo' plan can't do what most businesses need email marketing for.
Constant Contact's email editor and templates are widely described as dated. Users report limited design flexibility, clunky drag-and-drop building, and templates that look like they haven't been updated since 2015.
Contract cancellation requires calling customer support. Users report being charged for months after requesting cancellation via email, with refunds requiring escalation to management.
Klaviyo
Active-profile billing punishes growth: 5K to 10K subscribers raises your bill 50%+ ($100 to $150/mo). As of February 2025, Klaviyo bills on 'active profiles' — explicitly suppressed and unsubscribed contacts do not count, but non-opted-in checkout contacts (people who gave their email without explicitly subscribing) do count. One agency client was paying for 20-30K profiles who had never opted in — $5,400/year wasted on contacts they could not legally market to.
SMS credits have hidden multipliers: add a single emoji and encoding changes make messages cost 2 credits instead of 1. MMS (images) = 3 credits. International SMS to UK = 5 credits. One client burned her entire monthly SMS budget in a single campaign because of emoji usage.
Klaviyo automatically upgrades your billing tier when contacts exceed a threshold but does not automatically downgrade when your list shrinks. No annual billing discount available — unusual for SaaS.
If monthly spend exceeds $10,000, brands are automatically enrolled in Klaviyo One with a mandatory 20% surcharge — $24,000/year extra added without opt-in. Professional support requires $5,000+/mo spend; below that, expect days-long ticket response times.
What teams are switching to
Replacing Constant Contact
Brevo (Sendinblue)
Free (300 emails/day), $9–$18/mo (5K-20K emails)
Pay-by-email-volume rather than contact count — store unlimited contacts for free. AI-powered send-time optimization and content generation. Includes CRM, SMS, and WhatsApp at no extra cost.
Kit (ConvertKit)
Free (10K subs), $39/mo (Creator), $79/mo (Creator Pro)
Creator-focused email platform with visual automation builder on all paid plans. AI subject line generator and content assistant included. Free plan supports up to 10,000 subscribers. Note: Kit raised prices 35% in September 2025.
MailerLite
Free (1K subs), $10/mo (Growing), $20/mo (Advanced)
Modern email marketing with AI writing assistant, smart sending, and advanced automation at a fraction of Constant Contact's price. 1,000 subscribers and 12,000 emails/month free.
Replacing Klaviyo
Brevo
Free (300 emails/day, unlimited contacts), from $29/mo
Pay per email sent, not per contact — fundamentally different cost structure. At 10K contacts, Brevo costs $29/mo vs Klaviyo's $150/mo (81% cheaper). AI content generator and per-contact send-time optimization included.
Omnisend
From $16/mo, Pro $59/mo+
At 25K contacts: $282/mo vs Klaviyo's $400/mo (30% cheaper). SMS credits included in Pro plan. 250+ templates. Users report $68 return per dollar spent.
Sender
From $10/mo
At 10K contacts: $40/mo vs Klaviyo's $150/mo (73% cheaper). Described as '79% cheaper than Klaviyo' overall. 24/7 human support included at all tiers.
StackCut doesn't sell or recommend any of these tools. We show them for context. The decision is yours.
Total Cost of Ownership
Subscription fees plus labor and error costs, modeled at $50/hr loaded rate (BLS ECEC).
| Cost Component | Constant Contact | Klaviyo |
|---|---|---|
| Annual subscription | $720 | $1,200 |
| Labor cost | $9,000 | $9,000 |
| Error & rework cost | $1,200 | $1,200 |
| Total Cost of Ownership | $10,920/yr | $11,400/yr |
| Est. AI alternative | $5,088/yr | $5,088/yr |
Labor rate based on BLS ECEC June 2025 ($45.65/hr private industry total compensation, rounded to $50). Team sizes differ because each vendor targets different market segments. Your actual numbers depend on team size, role mix, and usage. Run it with your own data.
Which one fits your team?
Both Constant Contact and Klaviyocost more than their published pricing suggests. The right choice depends on your team size and how you weigh each tool's trade-offs.
Constant Contact starts at $12/seat/mo , but watch for Constant Contact's pricing scales aggressively with contact count. The $12/mo Lite price is for 500 contacts. At 10,000 contacts, Lite jumps to $120/mo, Standard to $160/mo, and Premium to $300/mo. A 50,000-contact list costs $430/mo on Premium.
Klaviyo starts at $20/mo , but watch for Active-profile billing punishes growth: 5K to 10K subscribers raises your bill 50%+ ($100 to $150/mo). As of February 2025, Klaviyo bills on 'active profiles' — explicitly suppressed and unsubscribed contacts do not count, but non-opted-in checkout contacts (people who gave their email without explicitly subscribing) do count. One agency client was paying for 20-30K profiles who had never opted in — $5,400/year wasted on contacts they could not legally market to.
An AI-native alternative may replace the workflow at a fraction of the TCO.
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