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Windsor.ai vs Causality Engine

Windsor.ai is best for small businesses wanting affordable MTA with data connectors. Choose Causality Engine when you need a defensible per-channel read before a budget decision, from the GA4 export you already have.

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€99 once, excl. VAT. Keep Windsor.ai; use us as the causal second opinion.

Side by side. Every fact sourced.

Short answer: Keep Windsor.ai. 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 Windsor.ai's rules-based and data-driven MTA, for €99.

Scroll the table sideways for every column.

Causality Engine compared with Windsor.ai: data, measurement, buying, company and reviews. Vendor facts read 12 October 2026, each with its source below the table.
Compared onCausality EngineThe layer on topWindsor.aiMulti-touch attribution with data integration
Compatible with Causality EngineIt is the layerReads your GA4 exportYesKeep Windsor.ai, add the read
Pay once, no subscriptionYes€99 per read; Pro at €299 a month is optionalSubscriptionFree plan; paid from $19/mo billed annually
Price stays flat as you growYes€99 a read, whatever your revenue or ad spendNot stated
Money back if it does not helpYesFull refund within 30 days, no questions askedNo refunds; all sales are final1
MethodCausal inference on your GA4 exportRules-based and data-driven MTA
Starting price€99 once, excl. VATFree plan; paid from $19/mo billed annuallywindsor.ai/pricing, read
Pricing model€99 per read, or Pro at €299 a monthFree after a 30-day trial; Basic $19 to Professional $499 a month billed annually ($23 to $598 monthly); Enterprise quoted
SetupUpload a GA4 export; results in 1 to 2 minutes30 minutes
Best forEcommerce brands on GA4 spending on two or more channelsSmall businesses wanting affordable MTA with data connectors
How it gets your data
Needs its own pixel, tag or SDKNoNothing to installNo2
Works with Google Analytics 4YesA GA4 export is the inputYes3
Native store integrationsAny store that runs GA4Shopify, WooCommerce, Shopware, Magento or a custom buildShopify, WooCommerce, BigCommerce, Magento / Adobe Commerce, Amazon4
Server-side tracking or conversion APIsNoIt reads data you already collectNot stated
What it measures
Multi-touch attributionNoCausal attribution: what each channel causedNot stated
Marketing mix modellingNoNot stated
Incrementality or holdout testsNoNo test to runNot stated
Post-purchase surveysNoNot stated
How you buy it
Self-serve sign-upYesUpload at /startYes5
Free trial or free planFirst finding freeThe €99 read is refundable within 30 days30-day free trial, then Forever Free plan6
Billing termsNone for the readPro is billed monthly, cancel any timeMonthly or annual (annual paid upfront)7
Who makes it
HeadquartersUtrecht, NetherlandsZürich, Switzerland8
Founded202320179
States EU data hostingYesPrimary infrastructure in the EU, per our privacy policyYes10
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. windsor.ai/terms-of-service: “All sales are final, and Windsor.ai will not issue refunds, including for prepaid monthly fees.”
  2. 2. windsor.ai/connectors/shopify: “Forget CSVs. Stop copy/paste. Connect data in minutes. No code required.”
  3. 3. windsor.ai/pricing: “data sources, including Google Analytics 4 (GA4), Facebook Ads, Google Ads, LinkedIn Ads, etc.”
  4. 4. windsor.ai/data-integration: “Automatically transfer data from 350+ sources - marketing platforms, CRMs, eCommerce sites, and more … Amazon Seller Central (Amazon SP) … BigCommerce … Magento … Shopify … WooCommerce”
  5. 5. windsor.ai/pricing: “There are no setup or hidden onboarding fees with any of our plans. Subscribe and start using Windsor.ai right away.”
  6. 6. windsor.ai/pricing: “30-day free trial period ... Forever Free plan (after 30-day trial)”
  7. 7. windsor.ai/pricing: “For annual plans, the full year is paid upfront.”
  8. 8. linkedin.com/company/windsor.ai: “Headquarters Zürich, Zürich”
  9. 9. windsor.ai/about: “That's why I founded Windsor.ai in 2017. I started in Zurich”
  10. 10. windsor.ai/pricing: “Our servers are hosted in a world-class data center in Germany.”

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.

Where Windsor.ai falls short

  • Low-cost tier is severely limited
  • Rules-based models are subjective
  • No causal inference methodology
  • Accuracy degrades with iOS privacy changes

What Causality Engine does differently

  • No pixel and no tag. It reads the GA4 export you already have, where Windsor.ai needs its own tracking on the store.
  • What each channel caused, next to what last-click gave it, with a data-health score on every channel.
  • The first number 1 to 2 minutes after the upload, on whatever GA4 history you export; 12 months or more reads best.
  • €99 once, excl. VAT. Pro is €299 a month, billed monthly, cancel any time.
  • Full refund within 30 days, no questions asked. You keep the read.

Windsor.ai and Causality Engine: questions

  • What does Windsor.ai cost?
    Windsor.ai's pricing page lists Free plan; paid from $19/mo billed annually.Source: windsor.ai/pricing, read .
  • How does Windsor.ai measure, and how does Causality Engine?
    Windsor.ai: Rules-based and data-driven MTA. Causality Engine: causal inference on your GA4 export, showing what each channel caused next to what last-click gave it.
  • Does Windsor.ai need a pixel or tracking script?
    No, according to windsor.ai. Causality Engine needs none: nothing to install.Source: windsor.ai/connectors/shopify, read .
  • What does Causality Engine cost?
    The first finding is free and runs in your browser before any signup. The full read is €99 once, excl. VAT, refundable within 30 days, no questions asked. Pro is €299 a month, billed monthly, cancel any time. The price does not rise with revenue, ad spend, orders or traffic.
  • Can I use Causality Engine together with Windsor.ai?
    Yes. 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.

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.

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The free finding runs in your browser. Your file never leaves it. The full read is €99, refundable within 30 days, no questions asked. Prices exclude VAT.