AEO for vector databases: AI search visibility ranking
How AI search engines rank vector databases by visibility and citations. 20 brands measured quarterly across Google AI Mode: which brands the AI names in answers, which domains it cites as sources, and how the leaders compare. Vector databases used to store embeddings, run similarity search, and support retrieval-heavy AI applications and semantic discovery. Composite score: 70% visibility (% of AI answers naming the brand) + 30% citation rate (% citing the brand's domain). Full methodology →
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When it comes to Vector databases, AI engines frequently name pgvector as the top choice, achieving a visibility score of 37.5 percent. Pinecone and Milvus follow closely as other leading brands. This ranking reflects how often these brands are mentioned in response to buyer questions about AI-driven database solutions.
The rankings are shaped by prominent online sources like Google and YouTube, which serve as major citation points for AI engines. These are often aggregator or review sites, meaning they reflect a consensus opinion rather than individual experiences. This broadens the impact of these brands' visibility among potential buyers.
For a buyer, the key takeaway is to consider how frequently AI engines reference recent reviews and third-party validations. Brands with higher rankings typically exhibit strong topical authority and credibility in the vector database subcategory, indicating a potentially more reliable and well-regarded choice.
At a glance
What we observed in this category
pgvector and Pinecone share the top rank with identical visibility scores of 37.5% and composite scores of 26.2, well above the category average visibility of 9.4%. The next tier, Milvus and MongoDB Atlas, sits at 25.0% visibility, creating a meaningful gap between the top two and the rest. Below rank four, visibility collapses to 12.5% or zero, meaning the majority of the 20 brands tracked have almost no presence in Google AI Mode responses for this category.
A sharp divergence between visibility and citation defines the AEO landscape here. Milvus is the only brand carrying any citation share at 12.5%, despite ranking third on visibility. pgvector and Pinecone, the two most visible brands, hold 0.0% citation each, meaning Google AI Mode names them frequently but does not link back to their domains. This named-but-not-trusted pattern is common across the top five and points to a structural weakness in how these brands are referenced by the AI.
The top cited sources in this category are third-party domains including youtube.com, encore.dev, zenml.io, and reddit.com, rather than any brand's own domain. Google AI Mode appears to anchor its answers on tutorial content, community discussion, and integration guides hosted outside vendor sites. MongoDB Atlas is the standout mover, jumping from rank 18 to rank 4 with a 25.0 percentage point visibility gain, while Qdrant fell sharply, losing 37.5 points of visibility and 12.5 points of citation from the previous period.
Movers & shakers since last refresh
Biggest visibility risers
-
MongoDB Atlas 0% → 25% · rank #18 → #4+25pp
-
Milvus 12% → 25% · rank #7 → #3+12pp
-
Elastic 0% → 12% · rank #10 → #8+12pp
Biggest visibility fallers
-
Qdrant 50% → 12% · rank #3 → #5-38pp
-
pgvector 62% → 38% · rank #1 → #1-25pp
-
Weaviate 38% → 12% · rank #4 → #6-25pp
The AEO ranking
| # | Brand | Visibility | Citation | Top engine |
|---|---|---|---|---|
| 1 |
pgvector.org
|
38% | 0% | Google AI Mode |
pgvector ties Pinecone at 37.5% visibility and a composite score of 26.2, nearly four times the category average visibility, but holds zero citation share. |
||||
| 2 |
pinecone.io
|
38% | 0% | Google AI Mode |
Pinecone matches pgvector exactly at 37.5% visibility and 0.0% citation, indicating high mention frequency in Google AI Mode with no direct domain referral. |
||||
| 3 |
milvus.io
|
25% | 12% | Google AI Mode |
Milvus is the only top-five brand with any citation share at 12.5%, making it the sole brand currently earning referral-level trust from Google AI Mode in this category. |
||||
| 4 |
mongodb.com
|
25% | 0% | Google AI Mode |
MongoDB Atlas rose from rank 18 to rank 4, gaining 25.0 percentage points of visibility, the largest single-period improvement recorded across all 20 tracked brands. |
||||
| 5 |
qdrant.tech
|
12% | 0% | Google AI Mode |
Qdrant dropped from rank 3 to rank 5, shedding 37.5 points of visibility and 12.5 points of citation, the steepest combined decline in the current audit period. |
||||
| 6 |
weaviate.io
|
12% | 0% | Google AI Mode |
| 7 |
trychroma.com
|
12% | 0% | Google AI Mode |
| 8 |
elastic.co
|
12% | 0% | Google AI Mode |
| 9 |
vespa.ai
|
12% | 0% | Google AI Mode |
| 10 |
redis.io
|
0% | 0% | Google AI Mode |
| 11 |
zilliz.com
|
0% | 0% | Google AI Mode |
| 12 |
couchbase.com
|
0% | 0% | Google AI Mode |
| 13 |
neo4j.com
|
0% | 0% | Google AI Mode |
| 14 |
singlestore.com
|
0% | 0% | Google AI Mode |
| 15 |
lancedb.com
|
0% | 0% | Google AI Mode |
| 16 |
datastax.com
|
0% | 0% | Google AI Mode |
| 17 |
vald.vdaas.org
|
0% | 0% | Google AI Mode |
| 18 |
marqo.ai
|
0% | 0% | Google AI Mode |
| 19 |
typesense.org
|
0% | 0% | Google AI Mode |
| 20 |
oracle.com
|
0% | 0% | Google AI Mode |
Sources AI engines trust in this category
Across the 8 buyer-intent queries we ran on vector databases, these are the domains Google AI Mode cited most often. If you're not on this list — or if your competitors are — that's a concrete PR / linkbuilding target.
How to read this AEO ranking
Four things worth knowing before you act on the numbers above. These are the same definitions across every industry page — for category-specific observations, see the What we observed section above (where available) and the per-brand insights inline in the ranking.
Visibility = being named
A brand's visibility % is the share of AI answers that mention it by name in the response prose. This is who AI engines actively recommend to the buyer. More on visibility →
Citation rate = being trusted
Citation rate is the share of AI answers that include the brand's domain as a clickable source link. This is what the AI treats as authoritative evidence, different from being named. More on citation rate →
Top engine differs by brand
The "top engine" column shows which AI surface each brand performs best on. Big gaps between a brand's score across engines usually points to specific content or schema gaps. How AI engines pick sources →
AEO rankings move month to month
AI engines re-crawl and re-rank on shorter cycles than classical search. We re-audit every brand on this list at least every 90 days and refresh this page automatically. How AI search ranking works →
Run an AEO audit on your own vector databases brand
The brands above were curated from public market-leader lists. Want the same answer engine optimisation measurement against your own brand — including the queries you appear on, which competitors get named instead, and a prioritised fix list? Run a free preview.
Frequently asked about AEO for vector databases
Who leads AEO in the Vector databases category?
pgvector and Pinecone share the top position with identical visibility scores of 37.5% and composite scores of 26.2, both significantly above the category average of 9.4%.
Which Vector databases brand earns the most citations from Google AI Mode?
Milvus is the only brand in the top five with a non-zero citation rate, at 12.5%, while all other leading brands including pgvector and Pinecone hold 0.0% citation share.
What sources does Google AI Mode anchor on when answering Vector databases queries?
The top cited sources are third-party domains including youtube.com, encore.dev, zenml.io, and reddit.com, suggesting the AI draws primarily from tutorials and community content rather than vendor sites.
Which brand has shown the biggest AEO improvement in the Vector databases category?
MongoDB Atlas jumped from rank 18 to rank 4, recording a visibility gain of 25.0 percentage points, the largest positive movement in the current audit period.
Why do high-visibility Vector databases brands still show zero citation rates?
Brands like pgvector and Pinecone are frequently named in Google AI Mode answers but are not being linked back to their own domains, a pattern indicating they are referenced as known entities rather than as cited sources.
Which previously strong brands have lost AEO ground in Vector databases?
Qdrant lost 37.5 points of visibility and 12.5 points of citation from the previous period, and Weaviate fell 25.0 points of visibility, both dropping two positions in rank.