Klaviyo vs Resend
They differ on 6 of the 13 things buyers in this category actually ask about. Here is where, and what each one asks you to give up.
Klaviyo
UsageEcommerce lifecycle marketing with revenue attribution per flow.
Strongest argument
Attributes revenue to individual flows, so spend is defensible
Biggest objection
Expensive at larger list sizes
Built around ecommerce — a poor fit for B2B or content newsletters.
Resend
UsageDeveloper-first email API with React-based templates and a light broadcast layer.
Strongest argument
Templates authored in React and versioned in your repo
Biggest objection
Marketing teams cannot ship a campaign without a developer
Engineering owns email here — there is no rich marketer-facing builder.
The differences that matter
Where they actually diverge
Only the rows where the two disagree. Everything they both do is listed below.
Cost
What each costs at 50 people
List price only. It ignores add-ons, seat minimums and the cost of the move itself — all of which routinely dwarf the difference below.
Prices are unverified estimates — useful for comparing orders of magnitude, not for budgeting. Confirm the current figure with the vendor before you commit to anything.
Common ground
What both of them do
These will not help you choose — which is exactly why they are worth knowing about before a vendor pitches one as a differentiator.
- Transactional sendingYes
- SOC 2Yes
- EU data residencyNo
- Self-hostableNo
- Open sourceNo
- Public APIYes
- Native mobile appsNo
In full
Every pro and con, both sides
Klaviyo
- Attributes revenue to individual flows, so spend is defensible
- Behavioural segmentation on real store data
- Email and SMS in one platform with shared profiles
- Expensive at larger list sizes
- Wasted on teams without a store to attribute against
- Steeper learning curve than general-purpose senders
Resend
- Templates authored in React and versioned in your repo
- Clean API and excellent deliverability tooling
- Very cheap at moderate volume
- Marketing teams cannot ship a campaign without a developer
- Automation and segmentation are minimal
- Younger product with a smaller integration surface
Questions
Klaviyo vs Resend, answered
Klaviyo or Resend — which is better?
Neither, in the abstract. Klaviyo suits you if attributes revenue to individual flows, so spend is defensible matters most; Resend if templates authored in React and versioned in your repo does. The honest trade-offs are: Klaviyo — Built around ecommerce — a poor fit for B2B or content newsletters. Resend — Engineering owns email here — there is no rich marketer-facing builder.
Is Klaviyo cheaper than Resend?
At least one of them is priced on usage rather than headcount, so there is no honest like-for-like figure. Model both against your own volume — contacts, events or tickets — before comparing, because the headline numbers measure different things.
Can we migrate from Klaviyo to Resend?
Usually yes, and the difficulty depends on history, integrations and headcount far more than on the two products. Data export quality is the thing to check first: ask both vendors what you can take with you before you commit to either. Our questionnaire produces a scoped estimate for the move.
What else should we consider besides Klaviyo and Resend?
In email marketing the other credible options are Brevo, Kit (ConvertKit), Mailchimp. Narrowing to two before you have written down your requirements is the most common way to end up with the wrong one.