← Back to Blog

Meta's Andromeda Update Broke Your Shopify Ads — Here's What Actually Happened

April 2026 · 6 min read

If you run a Shopify store and advertise on Meta, you've probably noticed your ads getting more expensive and less effective. ROAS dropped. The audiences that used to work stopped working. Most brands blamed creative fatigue or increased competition. The real problem was deeper — Meta fundamentally changed how its ad delivery algorithm works with a system called Andromeda, which began rolling out in late 2024 and completed its full deployment by October 2025.

What Is Andromeda?

Andromeda is Meta's ad retrieval system — the first stage of deciding which ads to show to which people. Built on NVIDIA Grace Hopper Superchips, it increased Meta's ad ranking model capacity by 10,000×. The system can now evaluate up to 100,000 ads per person per auction, compared to a much smaller pool before. Meta reported an 8% improvement in ad quality and a 6% improvement in recall after the rollout.

More ads evaluated per auction sounds like it should help. But with dramatically more competition per auction, the algorithm became far more dependent on signal quality to pick winners. Andromeda also shifted from audience-first matching to creative-first matching — it clusters similar creatives using Entity IDs and evaluates them together. For most Shopify stores relying on basic pixel data, this shift has been brutal.

The Signal Problem

Your Shopify pixel fires a handful of standard events — PageView, ViewContent, AddToCart, Purchase. That's maybe 5-7 signals per visitor session. But Andromeda's ad ranking system rewards advertisers who provide richer, more frequent conversion signals.

When your competitor sends Meta 70 behavioral signals per visitor and you send 5, the algorithm doesn't just prefer their ads — it learns faster who to show them to. Your campaigns are essentially training the algorithm with a fraction of the data they need.

iOS 14.5 Made It Worse

If Andromeda raised the bar for signal quality, iOS 14.5 cut the signal at the knees. Apple's App Tracking Transparency saw roughly 75% of iOS users opt out of tracking, and IDFA availability dropped to around 6%. Meta lost visibility into what users do after clicking an ad.

For Shopify stores, the browser pixel now misses an estimated 25-40% of conversion events depending on audience composition — higher for stores with iOS-heavy traffic. Every missed event is a missed training signal for the algorithm. Your campaigns are optimizing on incomplete data, and the 20-40% underreporting gap means Meta can't properly attribute conversions or optimize delivery.

What To Do About It

The fix isn't another app or a new bidding strategy. The fix is fundamentally better data.

• Server-side tracking (CAPI) — fire conversion events from your server, not the browser. No ad blockers, no cookie restrictions, no ITP. Read our complete CAPI guide for Shopify.
• Behavioral signals beyond standard events — track scroll depth, product interaction time, comparison behavior, size selection patterns, review reading, and dozens of other high-intent signals the pixel ignores.
• Intent scoring — not all visitors are equal. Sending Meta a "ViewContent" for someone who bounced in 3 seconds and someone who spent 4 minutes reading reviews is the same signal for very different intent. Score them differently.
• Suppression signals — tell Meta who NOT to show ads to. Low-intent visitors, serial returners, bot traffic. Reducing wasted impressions is as valuable as improving targeting.

This is exactly what KAK Cortex was built to solve — it captures 70+ behavioral signals, scores every visitor by purchase intent, and fires smart CAPI events that give Andromeda what it needs to rank your ads higher.