What they remember. Or what actually caused the sale.
Choose Fairing when your channel mix has dark-social, podcast, influencer, or offline components that pixels and last-click can't see, and you want the customer's own answer about discovery. Stack Causality Engine alongside when the question is quantitative: what did each channel actually cause, next to what last-click gave it.
€99 once, excl. VAT. Keep Fairing; use us as the causal second opinion.
Same question, different answer. Often the opposite answer.
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.
Compatible with Causality Engine: Yes. It installs nothing on your site; the one condition is GA4.
- Fairing answers
- What does the customer remember?Post-purchase survey on the thank-you page
- Causality Engine answers
- What actually caused the sale?Causal inference, next to last-click
| Compared on | Causality Engine | Fairing |
|---|---|---|
| Method | Quantitative causal inference on a GA4 export | Self-reported post-purchase survey |
| Surfaces dark / offline channels? | No: a GA4 export has no offline data; Direct is split back to tracked channels | Yes, directly (survey response) |
| Install | None | Survey widget on thank-you page |
| Price | €99 per read · €299/mo ProExcl. VAT | Plans by order volume; quote on fairing.co |
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.
Every fact, sourced. And why you can keep Fairing.
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)”
The short version. What each one is for.
Fairing (previously Enquire Labs) runs zero-party post-purchase surveys on the Shopify thank-you page. 'How did you hear about us?' lands a self-reported answer that pixels and platforms can't see: dark social, podcasts, word of mouth, an influencer five weeks ago. For brands acquiring through channels their pixel doesn't track, that signal is uniquely valuable.
What it isn't: a statistical measurement of incremental impact. Reviewers consistently flag recency bias and recall error, and Fairing's own guidance frames it as a complement, not a replacement. Pricing is by order volume; the published plan prices render only in the browser, so none are quoted here.
Which one is the right call for your situation.
Choose Fairing when
your channel mix has dark-social, podcast, influencer, or offline components that pixels and last-click can't see, and you want the customer's own answer about discovery. That qualitative signal is uniquely Fairing's lane.
Stack Causality Engine alongside when
the question is quantitative: what did each channel actually cause, next to what last-click gave it. Self-reported survey answers and causal inference are different evidence; many brands run both and triangulate.
Take it to your CFO.
Not the same question. Surveys recover signal pixels can't see; causal inference quantifies what would have happened anyway. Run both; the budget decision sits on the causal side.
The questions buyers ask about us vs Fairing.
Is Causality Engine a Fairing alternative?
Not directly. Fairing captures customer self-reports; we quantify causal incrementality from your data. Brands often run both.Do you measure dark social or offline?
Indirectly. The causal model surfaces unexplained spend or residual variance the platforms can't account for. For named-channel discovery, Fairing's survey is the direct tool.
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.
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.