Fairing vs Causality Engine
Fairing is best for DTC and Shopify brands measuring marketing channels. Choose Causality Engine when you need a defensible per-channel read before a budget decision, from the GA4 export you already have.
€99 once, excl. VAT. Keep Fairing; use us as the causal second opinion.
Side by side. Every fact sourced.
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.
| Compared on | Causality EngineThe layer on top | FairingAttribution surveys to measure your marketing |
|---|---|---|
| Compatible with Causality Engine | It is the layerReads your GA4 export | YesKeep Fairing, add the read |
| Pay once, no subscription | Yes€99 per read; Pro at €299 a month is optional | SubscriptionFree plan; paid from $49/mo |
| Price stays flat as you grow | Yes€99 a read, whatever your revenue or ad spend | NoPriced on your order volume |
| Money back if it does not help | YesFull refund within 30 days, no questions asked | Fees are non-refundable1 |
| Method | Causal inference on your GA4 export | Post-purchase attribution surveys |
| Starting price | €99 once, excl. VAT | Free plan; paid from $49/mofairing.co/pricing, read |
| Pricing model | €99 per read, or Pro at €299 a month | Free 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) |
| Setup | Upload a GA4 export; results in 1 to 2 minutes | Shopify app install (other sites: script or GTM install); vendor says most customers are live in under 10 minutes |
| Best for | Ecommerce brands on GA4 spending on two or more channels | DTC and Shopify brands measuring marketing channels |
| How it gets your data | ||
| Needs its own pixel, tag or SDK | NoNothing to install | No |
| Works with Google Analytics 4 | YesA GA4 export is the input | Not stated |
| Native store integrations | Any store that runs GA4Shopify, WooCommerce, Shopware, Magento or a custom build | Shopify2 |
| Server-side tracking or conversion APIs | NoIt reads data you already collect | Not stated |
| What it measures | ||
| Multi-touch attribution | NoCausal attribution: what each channel caused | Not stated |
| Marketing mix modelling | No | No3 |
| Incrementality or holdout tests | NoNo test to run | Not stated |
| Post-purchase surveys | No | Yes4 |
| How you buy it | ||
| Self-serve sign-up | YesUpload at /start | Yes5 |
| Free trial or free plan | First finding freeThe €99 read is refundable within 30 days | Free plan (up to 200 transactions/mo); 14-day free trial on Core6 |
| Billing terms | None for the readPro is billed monthly, cancel any time | Monthly (Shopify billing every 30 days)7 |
| Who makes it | ||
| Headquarters | Utrecht, Netherlands | New York, United States8 |
| Founded | 2023 | Not stated |
| States EU data hosting | YesPrimary infrastructure in the EU, per our privacy policy | Not stated |
| What reviewers say | ||
| G2 | Not listed yet | Not stated |
| Capterra | Not listed yet | Not stated |
| Shopify App Store | No appNothing to install | 5.0 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. fairing.co/terms: “All payments made are non-refundable and non-transferable except as expressly provided in this Agreement.”
- 2. docs.fairing.co/docs/shopify: “Create a new account here or install us directly from Shopify's App Store .”
- 3. fairing.co/product/advanced-attribution: “Does this replace my attribution tool or MMM? It works alongside them.”
- 4. fairing.co: “Deploy across any platform - from one-click Shopify post-purchase surveys to custom consumer & B2B applications.”
- 5. fairing.co: “Free plan · No credit card required · On Shopify? Install in minutes.”
- 6. fairing.co/pricing: “Free Monthly volume: 0 - 200 transactions Free Get started for free … 14-Day Free Trial. No Credit Card Required.”
- 7. apps.shopify.com/fairing: “Recurring and usage-based charges are billed every 30 days.”
- 8. linkedin.com/company/fairing: “Headquarters New York, NY Type Privately Held Founded 2020”
- 9. apps.shopify.com/fairing: “Rating 5.0 (196)”
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 Fairing falls short
- Survey answers depend on what buyers remember and choose to say
What Causality Engine does differently
- No pixel and no tag. It reads the GA4 export you already have.
- 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.
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.
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.