Mailchimp holds the higher mean on campaign and automation (7.0 vs 6.0; 5 judges lean Mailchimp, 1 tie), deliverability (6.8 vs 3.8; 6 lean Mailchimp), list data control (7.0 vs 4.7; 6 lean Mailchimp), integrations (7.7 vs 5.8; 5 lean Mailchimp, 1 tie) and pricing transparency (5.3 vs 2.0; 6 lean Mailchimp). Klaviyo's higher mean is sovereignty, 1.8 vs 1.5, with 2 judges leaning Klaviyo, 0 leaning Mailchimp and 4 ties; Klaviyo's data residency reads EU optional against Mailchimp's US default. Consent and proof is the genuine split: 5.2 vs 5.5 with 3 judges leaning each way. The weighted totals the table lists — CRM manager 5 vs 6.7, deliverability engineer 5.2 vs 6.3, data-protection officer 3.8 vs 4.6, integrator 4.3 vs 6.2, skeptic 3.3 vs 5.7 — put the higher figure on Mailchimp's side. No overall winner is declared: the lean differs by criterion, and that difference is the answer.
Choose Klaviyo if
You need the option to keep contact data in the EU — Klaviyo's data residency is recorded as EU optional, Mailchimp's as US default.
Your contract terms must allow hosting wherever the vendor or its subprocessors maintain facilities — Klaviyo's processing agreement permits that, while Mailchimp's captured pages show US hosting as the fixed default with no EU option on those pages.
You weight sovereignty heavily in your scoring — Klaviyo's sovereignty mean is 1.8 against Mailchimp's 1.5, with 2 judges leaning Klaviyo, 0 leaning Mailchimp and 4 ties.
Your legal screen flags vendors whose subprocessor exposure is recorded as US Cloud Act — Mailchimp's attribute reads US Cloud Act; Klaviyo's is recorded as unknown.
Choose Mailchimp if
You need deliverability you can check before committing — deliverability means run 6.8 vs 3.8, with 6 judges leaning Mailchimp and 0 leaning Klaviyo.
You must be able to take your whole list with you — Mailchimp documents a whole-account export as a zip, and list data control runs 7.0 vs 4.7 with 6 judges leaning Mailchimp.
You need published plan prices before signing — the captured Klaviyo pages state no paid prices, only scaling by contact count and channels with a custom enterprise quote; pricing transparency runs 5.3 vs 2.0 with 6 judges leaning Mailchimp.
Your stack runs on Salesforce — Mailchimp states a two-way Salesforce sync among its 300+ integrations, and integrations leans 5 judges to Mailchimp with 1 tie.
You build branching customer journeys — Mailchimp's journey builder offers conditional and percentage splits, and campaign and automation runs 7.0 vs 6.0 with 5 judges leaning Mailchimp and 1 tie.
Read this comparison as one judge. Each weighs the same scores by what they care about.
The Shop Owner
Runs a shop where the newsletter is a revenue channel. Wants the shop connected properly — orders, carts, products flowing in, abandoned-cart and post-purchase flows out — and revenue attributed per campaign. Judges price against contribution, not against a competitor's tier.
Klaviyo
Mailchimp
This judge's pick
Criterion by criterion
Campaigns & automation
Klaviyo
The segmentation is genuinely built for a shop — purchase history, browsing behaviour, RFM groupings and predictive values like churn risk and next order date, with real-time updates and unlimited conditions — plus 'über 60 vorkonfigurierte Flows', more than 150 email templates and a drag-and-drop editor. We found no public information on a visual journey builder with branching, send-time optimisation or A/B testing of any kind, which is a real gap when the newsletter is a revenue channel.
Mailchimp
The journey builder is real: a visual flow map with conditional and percentage splits, wait-for-trigger steps, up to three triggers filterable by segmenting conditions, and abandoned-cart, product-retargeting and follow-up workflows wired straight to e-commerce carts, with e-commerce data in the reports I would bill against. Dynamic content and the bigger flow budgets sit in paid tiers only, and we found no public information on send-time optimisation or testing that reports significance, which holds it a step below the top of the scale.
Deliverability infrastructure
Klaviyo
There is a real deliverability guide covering bounce types in the product, spam traps, blacklists and sending infrastructure, a documented dedicated-IP warm-up of '30 days', and the guidance that 1 complaint per 1,000 messages already marks complaint levels as elevated. We found no public information on SPF, DKIM or DMARC setup, custom sending domains or automatic hard-bounce suppression, so the documented picture sits between the basics and proper infrastructure.
Mailchimp
Authentication is documented end to end — two CNAME records for DKIM and a TXT record for DMARC on a domain I own, with an automated setup route and nudges at the right moments — plus dedicated IPs with a roughly thirty-day warm-up and automatic soft/hard bounce categorisation that factors in engagement. We found no public information on complaint-loop handling, inbox-placement testing or reputation monitoring surfaced to the customer, so the top of the scale is not evidenced.
Consent, proof & tracking limits
Klaviyo
We found no public information on double opt-in as the documented default, one-click unsubscribe for my subscribers, or any way to limit or switch off open and click tracking, so the proof side is stronger than the arrival and tracking side.
Mailchimp
Consent is provable, which matters when a regulator writes: a plain-text version of the signup form's GDPR wording is recorded and viewable on each contact's profile, double opt-in runs per audience with a customisable confirmation mail, and formal data-subject-request processes plus a contact export to answer access requests are documented. Double opt-in can only be enabled for their own signup forms, and we found no public information on switching open and click tracking off per campaign, on unsubscribe honoured across lists, or on retention rules for inactive subscribers.
List ownership, import & exit
Klaviyo
Per-person export and per-profile deletion are built in, deletion is evidenced by a kept list of deleted profiles, and the data-processing agreement commits to deleting all copies 'innerhalb von 90 Tagen' after the contract ends with return on request. We found no public information on bulk or full-account export, whether engagement history and unsubscribe state travel with the subscribers, or on import and any export throttling, so I cannot confirm the list and its history remain fully mine on the way out.
Mailchimp
Exit is nearly a feature: a full account export as a zip covering audiences, campaign and template content, contact events and granular reporting, per-contact CSVs including opens, clicks, campaign interactions and consent data, and permanent per-member deletion is documented. The metering is real though — one export at a time and only one per 24-hour period, with contact exports per audience only — so leaving with a large account is slowed rather than priced out, but it stops this short of the top.
Integrations & API
Klaviyo
This is where a shop gets connected: a native Shopify integration with Klaviyo as 'der bevorzugte E-Mail-Plattform-Partner von Shopify' used by 'über 117.000 Shopify-Kunden', more than 350 prebuilt integrations, and developer tools spanning APIs, webhooks, SDKs and warehouse syncs. It stops short of the top because rate limits are 'set and enforce... in our sole discretion' rather than documented, we found no public information on webhook retries or a sandbox, and the API terms reserve the right to modify or terminate API access at any time without notice.
Mailchimp
This is the connection surface I want behind my counter: named connectors for Shopify, Square, Stripe and Lightspeed, a two-way Salesforce sync, an e-commerce store API feeding carts and orders into abandoned-cart journeys, list and batch webhooks with full management endpoints, batch operations, and both marketing and transactional sending on documented, versioned APIs with a stated rate limit on the search endpoint. We found no public information on a sandbox or on documented webhook retries, which is what keeps this just under the next rung.
European sovereignty
Klaviyo
The contracting entity is Klaviyo, Inc. of Boston, the API terms run under Massachusetts law, and the data-processing agreement permits storing and processing customer data wherever Klaviyo or its subprocessors maintain facilities, with transfers carried on the EU-U.S. Data Privacy Framework and standard contractual clauses. A published subprocessor list with 15 days' notice and transfer-impact-assessment support lift this above the bottom, but we found no public information on any EU hosting option or EU contracting entity, and as a buyer who weighs this heavily that decides it.
Mailchimp
Everything contractual points west: Intuit Inc. and The Rocket Science Group are the entities, storage sits in the US, and we found no public information on an EU hosting option or a published subprocessor list for the platform — the privacy statement instead names US services such as FullStory, Medallia and Google-hosted export files touching my subscribers' behaviour. The Standard Contractual Clauses in the data processing addendum and the Data Privacy Framework certification give a stated legal basis for the transfer, which is the only thing lifting this off the floor for me; as a buyer who weighs this heavily, it is disqualifying for a list I actually own.
Pricing transparency
Klaviyo
The free tier is fully quantified — 'Bis zu 250 aktive Profile', '500 E-Mails pro Monat', 'Mobiles Messaging im Wert von 5 $/Monat' — and the paid model is described as scaling on contact count and channels, with AI-agent add-ons at '− 30 %'. But we found no public information on paid-tier prices, overage rates or VAT treatment, so I cannot compute the real invoice for my list size and send volume from public pages alone.
Mailchimp
Headline prices, send limits and a plan comparison are public — free under 250 contacts, Essentials from €11.34 /Monat on one captured page and €11.50 /Monat on another, Standard likewise €17.45 and €17.68, with 5,000 / 6,000 / 150,000 monthly sends across the paid tiers — but the captured pages give different figures for the same plans, overage is announced without a rate, and contact sales is required above 200,000 contacts on one page and 250,000 on another. With SMS sold as an unpriced, approval-gated add-on, automation gated to higher tiers and no VAT treatment or invoice calculator stated, I cannot compute my real monthly invoice from these pages alone.
Sovereignty, side by side
Dimension
Klaviyo
Mailchimp
Legal entity
Not determined
Not determined
Ownership
Not determined
Foreign-controlled
Data residency
Not determined
Not determined
Subprocessors
Not determined
Not determined
Facts, side by side
Only facts both products carry under the same definition — anything else would not be a fair row.