Andromeda Algorithm
Meta's AI-powered ad retrieval engine that matches ads to users based on creative signals rather than audience targeting settings.
Your audience settings in Meta Ads Manager still work. They no longer direct delivery. A retrieval layer called Andromeda now reads your creative first - format, hook, visual tone - and uses those signals to predict which users should see it.
Meta announced Andromeda in December 2024. The full rollout across all objectives completed by October 2025.
How it shows up in the wild
Foxwell Digital (post-rollout account analysis, 2025 - via Nethority): Brands testing 20+ new ads per month see 65% higher ROAS than those testing fewer than 10, per Foxwell Digital’s post-rollout analysis. Andromeda clusters similar-looking ads into a single retrieval entity. A hundred variations of the same hook perform no better than ten distinct concepts.
Meta Engineering (official announcement, December 2024): Advertisers switching from interest-based targeting to Advantage+ creative saw 22% higher ROAS in Meta’s internal tracking of the rollout. Andromeda processes tens of millions of active ads per auction, narrowing them to thousands of candidates per user. The system represents a 10,000× increase in model complexity over the previous delivery infrastructure.
Taxfix (four-market Meta campaign, 2025–2026 - via SuperScale AI): Taxfix ships 15 to 40+ new ad variants per week across four markets and three languages. Audience constraints are minimal. On Meta UK, the result: +45% CTR and a 20% drop in CPA.
Why it matters
Under Andromeda, your creative brief is also your media plan. The audiences Meta finds are shaped by what your ad contains: format, hook, subject matter. Accounts with small, undifferentiated creative sets saw measurable declines in ROAS and top-funnel efficiency after the October 2025 rollout. My hunch is that the gap between high-volume creative accounts and low-volume ones will keep widening as Andromeda accumulates more signal to work with.
Related terms
- Dynamic Creative Optimization
- Meta Advantage+ Shopping Campaigns
- Creative Testing
- Lookalike Audience
Frequently asked questions
Does Andromeda replace audience targeting entirely? Your audience inputs still exist. They now act as guardrails, not delivery signals. Within those guardrails, Andromeda matches users to ads based on creative signal. Broad targeting with minimal constraints gives it the most room to work - which is why Meta now recommends Advantage+ campaigns with no manual audience restrictions for most objectives.
What counts as “distinct” creative to Andromeda? Andromeda clusters similar-looking ads into a single retrieval entity. Two ads with the same hook but different colors read as nearly identical signals. Distinct means different formats, different problems being addressed, different tones - not production variations of a single concept.
Is Andromeda the same thing as GEM? No. Andromeda handles retrieval - it narrows tens of millions of eligible ads to thousands of candidates per user before the auction starts. GEM (Generative Ads Recommendation Model) runs inside the auction and makes the final placement decision. Andromeda sets the shortlist; GEM picks from it.