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Switch from Klar to Causality Engine

Klar uses pixel-based MTA, MMM and geo tests. Causality Engine uses causal inference on your GA4 export. There is nothing to migrate: the first read takes 1 to 2 minutes, and you can run both side by side.

Get your first finding freeOr book a 30-min call.

€99 once, excl. VAT. Keep Klar running while you compare.

Klar and Causality Engine, side by side.

Short answer: Keep Klar. Causality Engine is not a replacement for it: it installs nothing and reads the GA4 export you already have, so it adds a read of what each channel caused on top of Klar's pixel-based MTA, MMM and geo tests, for €99.

Scroll the table sideways for every column.

Causality Engine compared with Klar: data, measurement, buying, company and reviews. Vendor facts read 12 October 2026, each with its source below the table.
Compared onCausality EngineThe layer on topKlarAttribution and insights software for eCommerce
Compatible with Causality EngineIt is the layerReads your GA4 exportYesKeep Klar, add the read
Pay once, no subscriptionYes€99 per read; Pro at €299 a month is optionalSubscription€200/mo
Price stays flat as you growYes€99 a read, whatever your revenue or ad spendNoPriced on your revenue
Money back if it does not helpYesFull refund within 30 days, no questions askedNot stated
MethodCausal inference on your GA4 exportPixel-based MTA, MMM and geo tests
Starting price€99 once, excl. VAT€200/mogetklar.com/pricing, read
Pricing model€99 per read, or Pro at €299 a monthTwo plans priced on last-12-month net revenue: Core from €200/month and Core + Attribution from €400/month; monthly (cancel monthly) or annual (rate locked 12 months); no set-up costs
SetupUpload a GA4 export; results in 1 to 2 minutes1-click shop and ad integrations plus Klar tracking script; vendor says onboarding within about 2 hours
Best forEcommerce brands on GA4 spending on two or more channelseCommerce brands with at least €1M annual net revenue
How it gets your data
Needs its own pixel, tag or SDKNoNothing to installYes1
Works with Google Analytics 4YesA GA4 export is the inputYes2
Native store integrationsAny store that runs GA4Shopify, WooCommerce, Shopware, Magento or a custom buildShopify, WooCommerce, Magento / Adobe Commerce, Amazon3
Server-side tracking or conversion APIsNoIt reads data you already collectYes4
What it measures
Multi-touch attributionNoCausal attribution: what each channel causedYes1
Marketing mix modellingNoYes5
Incrementality or holdout testsNoNo test to runYes6
Post-purchase surveysNoNot stated
How you buy it
Self-serve sign-upYesUpload at /startNot stated
Free trial or free planFirst finding freeThe €99 read is refundable within 30 days14-day free trial7
Billing termsNone for the readPro is billed monthly, cancel any timeMonthly or annual8
Who makes it
HeadquartersUtrecht, NetherlandsMunich, Germany9
Founded2023202110
States EU data hostingYesPrimary infrastructure in the EU, per our privacy policyYes11
What reviewers say
G2Not listed yetNot stated
CapterraNot listed yetNot stated
Shopify App StoreNo appNothing to installNot stated

Causality Engine installs nothing on your site. It reads the GA4 export you already have, so it runs on top of any tool here without touching its setup. The one condition: GA4 runs on your store too. “Not stated” means we could not find it on the vendor's own pages or listings on 12 October 2026; it does not mean the feature is missing.

Sources, read 12 October 2026

  1. 1. getklar.com/features/multi-touch-attribution: “Klar's first-party tracking pixel and Multi-Touch Attribution (MTA) reveal the true revenue impact of each touchpoint in real time.”
  2. 2. getklar.com/set-up: “Google Analytics Pull all your GA data into Klar easily by using your property ID.”
  3. 3. getklar.com/pricing: “It connects natively to your shop system (Shopify, Shopware, Magento, WooCommerce, Centra, Amazon), or to any other shop system via API.”
  4. 4. help.getklar.com/en/articles/10981661-setting-up-the-klar-pixel-via-serverside-tracking: “Instead of deploying a JS tracking script, you send events directly to Klar's server-side endpoint via HTTP POST requests.”
  5. 5. getklar.com/features/unified-marketing-measurement: “Klar's Marketing Mix Model (MMM) uncovers how brand awareness and other upper-funnel influences translate into conversions.”
  6. 6. getklar.com/features/incrementality: “Klar runs incrementality tests through geo-based holdouts”
  7. 7. getklar.com/pricing: “Yes. 14 days free trial starts after your account is completely set up.”
  8. 8. getklar.com/pricing: “You can pick the monthly option which allows you to cancel each month. You can instead also pick the annual option”
  9. 9. getklar.com/imprint: “Klar Insights GmbH, Marktstraße 18, 80802 München, Deutschland.”
  10. 10. linkedin.com/company/getklar: “Headquarters Munich, Bavaria Type Public Company Founded 2021”
  11. 11. getklar.com: “We are fully compliant with GDPR and ISO 27001 certified to keep your information safe, hosting your data in Europe only.”

Every tool we track, on every fact · The same facts as JSON

Competitor pricing is each vendor's publicly listed pricing as read on the date shown, and it changes without notice: verify on the vendor's own site before relying on it. Vendors without a public price are marked as such. Comparisons set Causality Engine's one-time €99 analysis against subscription models.

How to switch, in five steps.

  1. No cancellation required yet

    Keep Klar running. Causality Engine reads your GA4 CSV export, so nothing conflicts and no data moves between the two.

  2. Upload your GA4 CSV (no integration required)

    Export 12 months or more of GA4 data and upload it. Longer reads better. No OAuth, no pixel, no code, no DNS changes. Shopify native is on the roadmap.

  3. Run your first analysis

    What each channel caused, next to last-click, with a data-health score on each, 1 to 2 minutes after the upload. Compare it with what Klar was telling you.

  4. Evaluate side by side

    Run both for a month and compare them channel by channel. Where they disagree is where a budget decision is at stake.

  5. Cancel Klar when ready

    Only if the side-by-side says you should. Nothing in Causality Engine depends on Klar being gone.

Keep reading

Four named Dutch brands and our own store, with the figures they let us publish: the case studies.

GA4 export uploadNo pixel1–2 minutes to a first read30-day refund, no questions asked

Your platforms guess.
We run the math.

Upload a GA4 export and see what each channel caused, next to last-click, in 1–2 minutes. The read is yours to keep.

Get your first finding free

Free, in your browser: your file is not uploaded. The full read is €99, refundable within 30 days. Prices exclude VAT.
Or book a 30-min call.