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Switch from Fairing to Causality Engine

Fairing uses post-purchase attribution surveys. 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 Fairing running while you compare.

Fairing and Causality Engine, side by side.

Short answer: Keep Fairing. 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 Fairing's post-purchase attribution surveys, for €99.

Scroll the table sideways for every column.

Causality Engine compared with Fairing: data, measurement, buying, company and reviews. Vendor facts read 12 October 2026, each with its source below the table.
Compared onCausality EngineThe layer on topFairingAttribution surveys to measure your marketing
Compatible with Causality EngineIt is the layerReads your GA4 exportYesKeep Fairing, add the read
Pay once, no subscriptionYes€99 per read; Pro at €299 a month is optionalSubscriptionFree plan; paid from $49/mo
Price stays flat as you growYes€99 a read, whatever your revenue or ad spendNoPriced on your order volume
Money back if it does not helpYesFull refund within 30 days, no questions askedFees are non-refundable1
MethodCausal inference on your GA4 exportPost-purchase attribution surveys
Starting price€99 once, excl. VATFree plan; paid from $49/mofairing.co/pricing, read
Pricing model€99 per read, or Pro at €299 a monthFree up to 200 transactions a month; Core priced by monthly transaction volume from $49/month; Enterprise (30,000+ transactions) custom; paid add-ons (Advanced Attribution from $99/month, Data Sync $299/month)
SetupUpload a GA4 export; results in 1 to 2 minutesShopify app install (other sites: script or GTM install); vendor says most customers are live in under 10 minutes
Best forEcommerce brands on GA4 spending on two or more channelsDTC and Shopify brands measuring marketing channels
How it gets your data
Needs its own pixel, tag or SDKNoNothing to installNo
Works with Google Analytics 4YesA GA4 export is the inputNot stated
Native store integrationsAny store that runs GA4Shopify, WooCommerce, Shopware, Magento or a custom buildShopify2
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 modellingNoNo3
Incrementality or holdout testsNoNo test to runNot stated
Post-purchase surveysNoYes4
How you buy it
Self-serve sign-upYesUpload at /startYes5
Free trial or free planFirst finding freeThe €99 read is refundable within 30 daysFree plan (up to 200 transactions/mo); 14-day free trial on Core6
Billing termsNone for the readPro is billed monthly, cancel any timeMonthly (Shopify billing every 30 days)7
Who makes it
HeadquartersUtrecht, NetherlandsNew York, United States8
Founded2023Not stated
States EU data hostingYesPrimary infrastructure in the EU, per our privacy policyNot stated
What reviewers say
G2Not listed yetNot stated
CapterraNot listed yetNot stated
Shopify App StoreNo appNothing to install5.0 stars (196 reviews)9

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. fairing.co/terms: “All payments made are non-refundable and non-transferable except as expressly provided in this Agreement.”
  2. 2. docs.fairing.co/docs/shopify: “Create a new account here or install us directly from Shopify's App Store .”
  3. 3. fairing.co/product/advanced-attribution: “Does this replace my attribution tool or MMM? It works alongside them.”
  4. 4. fairing.co: “Deploy across any platform - from one-click Shopify post-purchase surveys to custom consumer & B2B applications.”
  5. 5. fairing.co: “Free plan · No credit card required · On Shopify? Install in minutes.”
  6. 6. fairing.co/pricing: “Free Monthly volume: 0 - 200 transactions Free Get started for free … 14-Day Free Trial. No Credit Card Required.”
  7. 7. apps.shopify.com/fairing: “Recurring and usage-based charges are billed every 30 days.”
  8. 8. linkedin.com/company/fairing: “Headquarters New York, NY Type Privately Held Founded 2020”
  9. 9. apps.shopify.com/fairing: “Rating 5.0 (196)”

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 Fairing 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 Fairing 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 Fairing when ready

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