Same question, opposite method.
Choose Cometly when you're a SaaS or subscription advertiser whose core problem is feeding cleaner conversion events back to Meta and Google for in-platform optimization, and you want Stripe-tied MRR and LTV attribution on top of pixel-grade tracking. Choose Causality Engine when the question is what each channel caused, not better click credit.
€99 once, excl. VAT. Keep Cometly; use us as the causal second opinion.
Same question, different answer. Often the opposite answer.
Short answer: Keep Cometly. 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 Cometly's first-party pixel + server-side tracking, for €99.
Compatible with Causality Engine: Yes. It installs nothing on your site; the one condition is GA4.
- Cometly answers
- Which touch gets the credit?Pixel + CAPI + rule-based model
- Causality Engine answers
- Which spend was actually incremental?Causal inference, next to last-click
| Compared on | Causality Engine | Cometly |
|---|---|---|
| Method | Causal inference on a GA4 export | Pixel + CAPI + MTA models |
| Install | None (CSV upload) | Comet Pixel + server-side + CAPI |
| Price | €99 per read · €299/mo ProExcl. VAT | Usage-based, quoted on a call; Core from $750/mocometly.com/affiliates, read |
| Best for | GA4 ecommerce budget decisions, with a data-health score per channel | Subscription/SaaS advertisers wanting better CAPI signal |
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 Cometly.
Short answer: Keep Cometly. 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 Cometly's first-party pixel + server-side tracking, for €99.
Scroll the table sideways for every column.
| Compared on | Causality EngineThe layer on top | CometlyAttribution built for B2B SaaS |
|---|---|---|
| Compatible with Causality Engine | It is the layerReads your GA4 export | YesKeep Cometly, add the read |
| Pay once, no subscription | Yes€99 per read; Pro at €299 a month is optional | Subscription$750/mo |
| Price stays flat as you grow | Yes€99 a read, whatever your revenue or ad spend | NoPriced on your traffic or events |
| 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 | First-party pixel + server-side tracking |
| Starting price | €99 once, excl. VAT | $750/mocometly.com/affiliates, read |
| Pricing model | €99 per read, or Pro at €299 a month | Usage-based on monthly pageviews and quoted on a call, with Core starting at $750/mo; monthly or annual billing; no free trial |
| Setup | Upload a GA4 export; results in 1 to 2 minutes | Guided onboarding (no self-serve trial) |
| Best for | Ecommerce brands on GA4 spending on two or more channels | B2B SaaS teams (Stripe- and CRM-native), not primarily ecommerce |
| How it gets your data | ||
| Needs its own pixel, tag or SDK | NoNothing to install | Yes2 |
| 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 | Shopify, WooCommerce, BigCommerce, Magento / Adobe Commerce, Wix3 |
| Server-side tracking or conversion APIs | NoIt reads data you already collect | Yes4 |
| What it measures | ||
| Multi-touch attribution | NoCausal attribution: what each channel caused | Yes5 |
| Marketing mix modelling | No | Not stated |
| Incrementality or holdout tests | NoNo test to run | Not stated |
| Post-purchase surveys | No | Not stated |
| How you buy it | ||
| Self-serve sign-up | YesUpload at /start | Not stated |
| Free trial or free plan | First finding freeThe €99 read is refundable within 30 days | No free trial6 |
| Billing terms | None for the readPro is billed monthly, cancel any time | Monthly or annual7 |
| Who makes it | ||
| Headquarters | Utrecht, Netherlands | Newtown, United States8 |
| Founded | 2023 | 20219 |
| 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 | Not 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. cometly.com/terms: “All fees, including subscription fees, overage charges, and Add-On fees, are non-refundable unless otherwise required by applicable law or expressly agreed in writing by Cometly.”
- 2. help.cometly.com/en/articles/10340439-install-verify-cometly-pixel: “This pixel must be placed in the <head> section of every website that you want to track.”
- 3. cometly.com/integrations: “Shopify … WooCommerce … Track Wix form submissions and store purchases … Pipe BigCommerce orders into Cometly attribution … Track Magento purchases”
- 4. cometly.com/pricing: “Both plans include unlimited connections to Meta, Google, LinkedIn, TikTok, Microsoft, Reddit, and Snapchat, including server-side Conversion API.”
- 5. cometly.com/pricing: “Core … Pixel Server-Side Tracking Multi-Touch Attribution Events”
- 6. cometly.com/pricing: “We don't run a free trial because attribution requires CRM and ad-platform setup to be useful.”
- 7. cometly.com/pricing: “Core and Enterprise are both available on monthly or annual billing. Pay annually and save 20%.”
- 8. linkedin.com/company/cometly: “Headquarters Newtown, Pennsylvania”
- 9. linkedin.com/company/cometly: “Founded 2021”
The short version. What each one is for.
Cometly is a polished, Stripe-native pixel + CAPI multi-touch attribution tool. One-line install, high Meta CAPI match quality, MRR and LTV attribution for subscription and SaaS advertisers. If your central problem is feeding cleaner conversion events back to Meta and Google for in-platform optimization, Cometly is genuinely good at that.
But it's a touch-crediting tracker (first / last / linear / U-shaped / data-driven), not a causal model. It tells you which click to thank inside the model it picked. It doesn't tell you which sales wouldn't have happened anyway, and it doesn't report confidence intervals. Different question entirely.
Which one is the right call for your situation.
Choose Cometly when
you're a SaaS or subscription advertiser whose core problem is feeding cleaner conversion events back to Meta and Google for in-platform optimization, and you want Stripe-tied MRR and LTV attribution on top of pixel-grade tracking. That's its home turf.
Choose Causality Engine when
the question is what each channel caused, not better click credit. You want it set next to what last-click gave each channel, on your existing GA4 history, for €99. No pixel, no session metering, no quote process.
Take it to your CFO.
Zero pixel install, no per-seat or per-session metering, no quote process. A €99 credit-card read versus a vendor quote on usage tiers.
The questions buyers ask about us vs Cometly.
Is Causality Engine a Cometly alternative?
For the question of what each channel caused, yes, and a no-pixel one. For Stripe-tied MRR or LTV attribution on subscription businesses, Cometly is purpose-built.Do I need the Comet Pixel installed?
No. We run on your existing GA4 export. Nothing on your pages.Can I run both?
Yes. Many brands use a pixel-based MTA tool for in-platform optimization and Causality Engine as the independent causal check on budget reallocation.
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.