Klaviyo is built for ecommerce, ConvertKit — now Kit — is built for creators, and Mailchimp is built for general small business. Each is excellent at the job it was designed for and mediocre outside it, which makes "which is best" the wrong question and "which is this business" the right one.
Pricing at scale, automation depth, and segmentation power all follow from that design choice rather than varying independently.
What each platform was built to do
| Klaviyo | Mailchimp | ConvertKit (Kit) | |
|---|---|---|---|
| Designed for | Ecommerce stores | General small business | Creators, writers, course sellers |
| Core strength | Behavioural segmentation on purchase data | Breadth of features and integrations | Simplicity and creator-specific tooling |
| Automation model | Flows built on store events | Customer journeys | Visual sequences and rules |
| Pricing driver | Contacts, with a lower free ceiling | Contacts, with tiered feature gates | Subscribers, with automation on paid tiers |
| Weakest at | Non-ecommerce use cases; cost at scale | Automation depth relative to price | Ecommerce data and product-level flows |
Klaviyo's advantage is data, not email. It ingests store events — products viewed, carts abandoned, orders placed, lifetime value, purchase frequency — and makes them segmentable. A store using Klaviyo without connecting that data is paying ecommerce prices for a general-purpose newsletter tool.
Mailchimp's advantage is breadth. Landing pages, forms, a website builder, ads, and a large integration catalogue. For a business that needs several tools and wants one bill, that breadth is the product.
Kit's advantage is fit. Tagging rather than lists, sequences that read like a writer's workflow, and creator-specific features such as recommendations and paid newsletters. A writer or course seller finds it does what they need without configuration.
Automation depth
| Capability | Klaviyo | Mailchimp | Kit |
|---|---|---|---|
| Welcome sequence | Yes | Yes | Yes |
| Cart abandonment on store events | Native, deep | Available, shallower | Requires integration |
| Browse abandonment | Native | Limited | Not native |
| Post-purchase flows by product | Native | Limited | Limited |
| Branching on behaviour | Extensive | Moderate | Moderate |
| Split testing inside flows | Yes | Limited by tier | Limited |
| Predictive segments | Yes | Limited by tier | No |
The gap that matters is store-event triggering. Cart and browse abandonment, post-purchase flows keyed to what was bought, and win-back windows based on purchase frequency all require the platform to understand orders as data rather than as a webhook payload. That is Klaviyo's whole design, and it is why an ecommerce store outgrows the other two.
For non-ecommerce senders the gap mostly disappears. A welcome sequence, a nurture flow, and a re-engagement campaign — the sequences that matter for most businesses, described in email automation: the sequences that make money — are well within all three.
Segmentation
Klaviyo segments on behaviour and purchase history. Customers who bought category A twice in six months and have not opened in thirty days is one segment definition, computed live.
Mailchimp segments on stored fields, tags, and campaign activity. Adequate for most businesses, and it starts to strain when conditions need combining across purchase behaviour and time.
Kit segments on tags and sequence membership. Deliberately simple, and it suits a business whose subscribers differ by interest rather than by transaction history.
The honest framing: segmentation power only matters to the degree you will use it. A business that sends one newsletter to everyone gains nothing from predictive segments, and the most common way to overpay in this category is buying segmentation depth to do a job that tagging already handled.
Deliverability
No platform delivers your mail for you. Sender reputation attaches primarily to your sending domain, and the domain moves with you between platforms — which is why switching rarely fixes a placement problem, explained in why authenticated emails still land in spam.
What differs between the three is narrower than the marketing suggests:
| Factor | Reality across all three |
|---|---|
| Custom domain authentication | All three support it through a guided wizard. All three default to signing under their own domain until you complete it |
| Shared IP pools | All three, with dedicated IPs available to high-volume senders |
| Automatic bounce suppression | All three |
| Diagnostic depth | Summary-level on all three; none offer message-level logs comparable to a transactional provider |
The one deliverability decision that genuinely differs is enforcement policy — how aggressively each platform removes customers with poor list practice, which determines shared-pool quality. That is not published by any of them, and it is the question to ask support before committing. Vague answers are an answer.
The structural comparison across platform tiers, including transactional providers, is in which email service actually delivers.
Pricing at scale
Published pricing changes too often to reproduce reliably, and the shape of each pricing model is stable and more useful than the numbers.
All three price primarily on contact or subscriber count, which means cost rises with list size regardless of how many people you actually mail. That has one consequence worth internalising: the sunset policy described in re-engagement emails reduces your bill as well as improving your placement.
Three model differences:
Klaviyo bills on active profiles and is generally the most expensive of the three at equivalent list sizes. The justification is the ecommerce revenue attribution — a store that can attribute revenue to flows can evaluate the cost directly, and a business that cannot is paying for capability it is not measuring.
Mailchimp gates features by tier as well as by contact count, so a growing business hits feature paywalls and contact paywalls separately. Checking which tier contains the automations you need is the pricing question that catches people out.
Kit charges on subscriber count with automation available on paid plans, and its free tier historically extends further than the other two for a sender who only needs broadcasts.
Verify current pricing on each vendor's own page before deciding. Any figure published in a comparison article, including this one, dates within a quarter.
Which one to pick
| Situation | Choose | Reasoning |
|---|---|---|
| Ecommerce store, revenue attributable to flows | Klaviyo | Store-event triggering and purchase segmentation are the product |
| Ecommerce store under early revenue, few flows | Mailchimp or Kit | Klaviyo's cost is not yet justified by the data you are using |
| Writer, newsletter, course seller | Kit | Creator tooling and tag-based simplicity fit the workflow |
| Small business needing forms, pages, and email in one bill | Mailchimp | Breadth is the reason to buy it |
| B2B with a CRM already in place | None of the three by default | Check what your CRM's native email can do first |
| Currently in a deliverability crisis | Stay where you are | Fix the list and the domain first; migration adds a warm-up on top |
The last row is the one worth dwelling on. A platform switch during a placement problem reproduces the problem on a new bill and adds a warm-up period — the migration protocol is in which email service actually delivers.
How to switch without burning reputation
Migration compresses two risks into one week: an unwarmed sending path and an unproven configuration.
Complete authentication first. Custom domain authentication on the new platform, verified, before a single campaign goes out. Confirm DKIM signs under your own domain rather than the platform's — the check is in email authentication.
Clean before you import. Migrating a list moves its problems too. Remove hard bounces and run the sunset policy before the export, not after the import.
Start with the most engaged segment. Thirty-day openers first, then widen over two to three weeks, watching complaint rate at each step.
Keep the old platform live until the new one shows stable delivery. Cutting the old account on day one removes the fallback at exactly the moment it is most likely to be needed.
Rebuild automations rather than exporting them. Flow logic rarely translates cleanly between platforms, and a migration is the cheapest opportunity to delete the sequences nobody was maintaining.
What's in the book, not here. The full migration checklist and the platform-switch reputation protocol are in The Email Deliverability Playbook.
Frequently asked questions
Is Klaviyo worth it for a small store?
Klaviyo is worth its higher cost when the store is actively using purchase data — cart and browse abandonment, post-purchase flows keyed to products, and segments built on purchase frequency. A store running only a welcome sequence and a newsletter is paying ecommerce prices for general-purpose capability.
Which email platform is best for creators?
ConvertKit, now Kit, is built for writers, newsletter publishers, and course sellers, with tag-based organisation rather than lists and creator-specific features such as recommendations and paid newsletters. Its simplicity is the product rather than a limitation.
Is Mailchimp still good in 2026?
Mailchimp remains a reasonable choice for general small businesses that want forms, landing pages, and email under one bill. Its weakness relative to price is automation depth, and its pricing gates features by tier as well as by contact count, so the automations you need may sit above the tier you expected.
Does switching email platforms improve deliverability?
Rarely. Sender reputation attaches primarily to your sending domain, which moves with you, so list-quality and complaint problems reproduce on the new platform with a warm-up period added. Switch for features, cost, or support rather than as a reputation reset.
What is the difference between Klaviyo and Mailchimp?
Klaviyo is built around ecommerce store events and segments on purchase behaviour, while Mailchimp is a general-purpose platform with broader non-email features and shallower automation. Klaviyo generally costs more at equivalent list sizes, justified only when the store data is actually being used.
Do all three platforms support SPF, DKIM, and DMARC?
All three support custom domain authentication through a guided setup, and all three default to signing under their own domain until that setup is completed. An incomplete setup is the most common cause of DMARC alignment failure regardless of which platform is in use.
How do I migrate between email platforms safely?
Complete custom domain authentication on the new platform first, clean the list before exporting rather than after importing, start sending to the most engaged segment, widen over two to three weeks while watching complaint rate, and keep the old platform live until delivery is stable.
What to do next
Answer one question before comparing features: is purchase behaviour something you will actually segment on? A yes points at Klaviyo, and a no makes its price difficult to justify.
If you are considering a switch because of deliverability, run the diagnostic in email deliverability first. Most senders shopping for a new platform have a list problem that will migrate with them.
Free: The 60-Minute Email Authentication Fix — the checklist to run on any new platform before the first send.
Go deeper: The Email Deliverability Playbook — the migration checklist and the platform-switch reputation protocol.
Related guides
- Email automation: the sequences that make money — what you are buying a platform to run
- Which email service actually delivers? — the structural comparison across all tiers
- Abandoned cart emails: why timing beats discounts — the flow that most needs store-event triggering
- Re-engagement emails: the risk nobody warns you of — the sunset policy that lowers your bill
- Email authentication: SPF, DKIM, DMARC and BIMI — the first thing to configure on any platform
- Why authenticated emails still land in spam — check before switching anything
Free: The 60-Minute Email Authentication Fix
A no-fluff checklist to set up SPF, DKIM & DMARC correctly and pass Gmail & Yahoo's sender requirements.
Muhammad Basim has worked in digital marketing since 2013, focused on email deliverability and AI-assisted content production. He is the author of the Email Deliverability Playbook and the Email Copywriting Playbook, and has run 100+ email campaigns for ecommerce brands, coaches, and B2B senders. He writes about email, SEO, WordPress, and AI — with a bias toward what can be tested over what sounds good.
Related Articles
How to Read Google Postmaster Tools
Google Postmaster Tools is a free dashboard reporting how Gmail treats mail from your domain, and since 2025 it no longer reports a reputation grade — it reports compliance, spam rate, and a plain-language verdict on whether Gmail's users want your email. No third-party checker carries the same authority, because no third party is making […]
Email Verification Tools: Which Are Worth Paying For
Email verification checks whether an address can receive mail, and it cannot tell you whether anyone behind it wants yours. That distinction decides whether the spend is worth it, because a verified address that never opens damages your reputation exactly as much as it did before you paid to confirm it exists. Verification solves one […]
Email Spam Traps: How to Find and Remove Them
A spam trap is an email address that exists only to catch senders with poor list practice, and no tool can tell you whether one is on your list. Traps accept mail silently. They do not bounce, they do not complain, and they do not appear in any report until the damage is already done. […]