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What is Meta Andromeda, and how does it decide who sees your ads?

the short answer

Meta Andromeda is the retrieval engine inside Meta's ad system that uses roughly the first 3 seconds of a creative to decide who sees it; near-identical hooks collapse into a single auction slot, so near-duplicate ads in the same set cannibalise each other's delivery.

Andromeda is the retrieval layer in Meta's ad-delivery stack, the stage that decides which of your creatives is even eligible to enter a given auction. It reads roughly the first 3 seconds of a creative, the hook, and uses that signal to match an ad to a person. The practical consequence is the part most marketers miss: when two creatives open the same way, Andromeda treats them as effectively the same entity and collapses them into a single auction slot.

That collapsing is why uploading ten variations of one hook rarely buys you ten times the reach. The retrieval engine cannot tell them apart, so they queue behind one slot and split the delivery that a single creative would have won. Omniscia scores how ready a creative set is for Andromeda and shows you exactly which of your ads are competing for the same slot before you spend into the overlap.

first 3 secondsof a creative Andromeda uses to decide delivery
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Why the first three seconds carry so much weight

Retrieval happens before optimisation. Before Meta's auction tries to find your lowest CPA, Andromeda has already decided which creatives are in the running, and it makes that call from the opening of the creative rather than the whole asset. A strong, distinct hook gets you into more auctions; a hook that mirrors another of your ads gets folded into theirs.

This is why hook variety, not production volume, is the lever. Six creatives that open with six genuinely different angles, a problem callout, a curiosity gap, a bold claim, a question, a visual shock, a testimonial opener, give Andromeda six distinct entities to place. Six creatives that all open on the same talking-head intro give it one.

What Omniscia surfaces about Andromeda

Omniscia computes an Andromeda readiness score for a set, then groups your ads into Entity ID clusters: which creatives share an auction slot and why they collapsed together. It reports an efficiency figure, the percentage of your creatives that are redundant in retrieval terms, so you can see at a glance how much of your set is fighting itself.

It also surfaces Untapped Branches: hook, angle, and format combinations you have not covered yet, each with a 'how to fill this gap' tip. Instead of guessing whether you have enough variety, you get a map of where your coverage is thin and where it is wastefully dense.

how it works

  1. 01

    analyse the set

    Run your live ad set through Omniscia to get its Andromeda readiness score and Entity ID clusters.

  2. 02

    find the collapses

    Read the clusters to see which creatives share an auction slot, and check the efficiency figure for how much of the set is redundant.

  3. 03

    diversify the openings

    Rework or pause near-duplicate hooks so each remaining creative opens with a distinct angle Andromeda can tell apart.

  4. 04

    fill the branches

    Use the Untapped Branches list to add the hook and format combinations you haven't covered, following each gap tip.

frequently asked

What exactly is Meta Andromeda?
It is the retrieval engine in Meta's ad-delivery system that decides which creatives are eligible for a given auction. It reads roughly the first 3 seconds of a creative and matches it to an audience before the auction optimises for cost.
Why do my similar ads not all get delivery?
Because Andromeda collapses near-identical hooks into a single auction slot. Variations that open the same way are treated as one entity, so they share delivery rather than multiplying it.
How does Omniscia measure Andromeda readiness?
It produces a readiness score for the set, groups your ads into Entity ID clusters that share a slot, reports an efficiency figure for how much is redundant, and lists Untapped Branches you haven't covered.
Does a higher creative count help with Andromeda?
Not by itself. What helps is variety across hooks, angles and formats. Many near-duplicate creatives collapse into one slot, so distinct openings matter more than raw volume.

Last updated June 6, 2026

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