Klaviyo vs Mailchimp
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.
| Klaviyo | Mailchimp | |
|---|---|---|
| Published rate | $20/mo | $13/mo |
| Team size modeled | 5 | 5 |
| Annual subscription | $1,200/yr | $780/yr |
What the invoice doesn't show
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.
Mailchimp
Mailchimp counts ALL contacts toward your billing tier — subscribed, unsubscribed, and non-opted-in. Unsubscribed contacts remain billable unless you manually archive them. A company with 10,000 'contacts' might have 3,000 active subscribers but pays the 10,000-tier rate.
Mailchimp deprecated the Classic Automation Builder in June 2025, pushing multi-step automations exclusively into the Standard plan ($20/mo minimum). Organizations running basic welcome sequences on Free or Essentials were forced to upgrade overnight.
When you exceed your contact or send limit, Mailchimp automatically adds extra email blocks and charges your next invoice — without an upgrade prompt or warning. The exact overage pricing isn't publicly listed, making costs impossible to predict.
Since Intuit acquired Mailchimp for $12B in 2021, pricing has increased 20-30% across paid tiers (Essentials from $9 to $13, Standard from $14 to $20), the free plan was gutted from 2,000 contacts to 250 — an 87.5% reduction — and an additional 11-13% increase was implemented in April 2026, pushing Premium's base to $375+/mo.
What teams are switching to
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.
Replacing Mailchimp
Brevo
Free (300 emails/day), Starter $9/mo, Business $18/mo
Charges by emails sent, not contacts stored. Unlimited contacts on all plans including free. Includes transactional email, SMS, and WhatsApp in one platform. A 50,000-contact list sending 50K emails/mo costs ~$35/mo vs Mailchimp's $450+.
Kit (formerly ConvertKit)
Free (10K subscribers), Creator $39/mo
Creator-focused with visual automation builder on all paid plans. Free plan supports up to 10,000 subscribers — 40x Mailchimp's free tier. No charge for unsubscribed contacts.
Loops
Free (1K contacts), $49/mo (5K contacts, unlimited sends)
Built for SaaS companies. One flat tier with all features — no feature gating at all. Includes marketing, transactional, and product emails in one platform. Unlimited sends on all paid plans.
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 | Klaviyo | Mailchimp |
|---|---|---|
| Annual subscription | $1,200 | $780 |
| Labor cost | $9,000 | $9,000 |
| Error & rework cost | $1,200 | $1,200 |
| Total Cost of Ownership | $11,400/yr | $10,980/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 Klaviyo and Mailchimpcost more than their published pricing suggests. The right choice depends on your team size and how you weigh each tool's trade-offs.
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.
Mailchimp starts at $13/mo , but watch for Mailchimp counts ALL contacts toward your billing tier — subscribed, unsubscribed, and non-opted-in. Unsubscribed contacts remain billable unless you manually archive them. A company with 10,000 'contacts' might have 3,000 active subscribers but pays the 10,000-tier rate.
An AI-native alternative may replace the workflow at a fraction of the TCO.
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