ConvertKit 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.
| ConvertKit | Klaviyo | |
|---|---|---|
| Published rate | $39/seat/mo | $20/mo |
| Team size modeled | 1 | 5 |
| Annual subscription | $468/yr | $1,200/yr |
What the invoice doesn't show
ConvertKit
Kit's Newsletter plan (free) supports up to 10,000 subscribers but blocks visual automations, sequences, and third-party integrations. The features that make email marketing effective require Creator ($39/mo, up 35% since September 2025) or Creator Pro ($79/mo).
Pricing scales steeply with subscriber count after the September 2025 increase. At 25,000 subscribers, Creator costs $99/mo and Creator Pro $166/mo. At 55,000 subscribers, Creator Pro hits $340/mo — well into enterprise tool pricing for what remains a creator-focused platform.
Kit lacks built-in A/B testing for email content (only subject lines). There's no send-time optimization, no multivariate testing, and limited segmentation compared to marketing automation platforms at similar price points.
Kit's visual automation builder, while praised for simplicity, can't handle complex conditional logic. Users report needing to build workarounds with tags and segments for workflows that tools like ActiveCampaign handle natively.
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 ConvertKit
Beehiiv
Free (2.5K subs), $49/mo (Scale), $99/mo (Max)
Newsletter platform built for growth with AI writing tools, built-in referral program, and ad network for monetization. Free plan includes unlimited sends and up to 2,500 subscribers. Designed for the creator economy Kit pioneered.
MailerLite
Free (1K subs), $10/mo (Growing), $20/mo (Advanced)
Full visual automation on paid plans starting at $10/mo vs Kit's $29/mo. AI writing assistant, A/B testing (not just subject lines), and send-time optimization included. More features at a lower price point.
Buttondown
Free (100 subs), $9/mo (Basic), $29/mo (Professional)
Minimalist newsletter tool for writers who want clean design without bloat. Markdown-native editor, built-in analytics, and paid subscription support. Free for up to 100 subscribers.
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 | ConvertKit | Klaviyo |
|---|---|---|
| Annual subscription | $468 | $1,200 |
| Labor cost | $9,000 | $9,000 |
| Error & rework cost | $1,200 | $1,200 |
| Total Cost of Ownership | $10,668/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 ConvertKit 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.
ConvertKit starts at $39/seat/mo , but watch for Kit's Newsletter plan (free) supports up to 10,000 subscribers but blocks visual automations, sequences, and third-party integrations. The features that make email marketing effective require Creator ($39/mo, up 35% since September 2025) or Creator Pro ($79/mo).
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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