Attribution · After iOS 14.5
Marketing Mix Modeling never used pixels. It reads your spend and revenue data directly — iOS updates are irrelevant.
Free tier: two channels, two analyses per month, full Bayesian engine — no pixel required.
April 2021
ATT prompt launches
Apple removes cross-app tracking without explicit opt-in. Meta pixel loses 40–60% of signal overnight.
2022–2024
Modeled conversions
Platforms backfill missing data with statistical guesses. Accuracy continues to degrade as iOS adoption grows.
2025+
Cookie deprecation
Third-party cookies follow the pixel. Web-based attribution loses the rest of its deterministic signal.
What actually changed in 2021
In April 2021, Apple removed the ability to track users across apps without explicit opt-in. Roughly 40–60% of the tracking signal that Meta's pixel, Google Tag Manager, and third-party attribution tools relied on disappeared overnight — and has continued shrinking as iOS adoption grows and browser cookie support contracts.
The platforms responded with modeled conversions, aggregated event measurement, and blended ROAS figures that became progressively harder to audit. If your attribution tool works by placing a pixel on your website or reading a conversion API, it is solving a problem that keeps getting harder to solve.
What works now
Marketing Mix Modeling is a different approach entirely: instead of following individual users, it measures the statistical relationship between your weekly spend across channels and your weekly revenue.
No cookies. No pixels. No user-level data. MMM was the industry standard before digital tracking existed — P&G, Unilever, and Coca-Cola have run this methodology for sixty years — and it is precisely the right methodology for a world where digital tracking is degrading.
MixLift delivers it in five minutes, for $299/month, through a Claude conversation. Full PyMC-Marketing, 4-chain MCMC, 90% credible intervals on every estimate. Upload a CSV, get channel-level incremental ROAS, saturation curves, and a budget optimizer.
What you get
01 · Pixel-free
Works from CSV. No tracking code.
Upload weekly spend and revenue per channel. No API integration. No pixel install. No platform credentials. The model does not need any of it.
02 · Bayesian
Full MCMC. Credible intervals on every estimate.
4-chain MCMC on PyMC-Marketing. Posterior distributions on channel-level ROAS, not point estimates. You see the uncertainty range, not a single number that hides it.
03 · Battle-tested
Sixty years of Fortune 500 use.
The methodology predates the web by decades. It was built for a world without cookies or cross-app identifiers — precisely the world iOS 14.5 and cookie deprecation are returning us to.
04 · Fast
Results in minutes. $299/month.
Same methodology enterprise vendors charge $1,500+/month for, delivered through a Claude conversation. Month-to-month. No onboarding call. No annual contract.
Two channels, two analyses per month, the full Bayesian engine. If your current attribution tool lost the thread after iOS 14.5, MixLift gives you a measurement path that does not depend on tracking at all.