pgvector vs Vespa.ai:Which is more popular?
In September 2026, pgvector had more branded searches than Vespa.ai among vector search platforms worldwide. pgvector had about 27,100 branded searches, while Vespa.ai had 1,490. pgvector made up 16.8% of all vector search platform searches we track, and Vespa.ai accounted for 0.92%. When we asked ChatGPT and Google AI Overviews about vector search platforms, pgvector appeared in all five answers and Vespa.ai in none.
Who do people search for more?
pgvector, about 18 searches for every 1 for Vespa.ai
Who does AI mention more?
pgvector, mentioned in every answer we collected
Who does AI recommend more?
pgvector, the only one of the two named
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Top vector search platforms in ChatGPT and Google AI Overviews
In three ChatGPT questions and two Google AI Overviews, pgvector appeared in all five answers. Vespa.ai did not appear in any of the five answers.
Most recommended by AI
Brands get a higher ranking if they are mentioned earlier in the answers.
Mentioned by AI
Each dot is one answer, filled in when that answer mentions the brand.
Qdrant5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
Pinecone5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers- pgvector5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
Weaviate5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
Milvus4 of 5Named in 2 of 3 ChatGPT answersNamed in 2 of 2 Google answers
Chroma3 of 5Named in 1 of 3 ChatGPT answersNamed in 2 of 2 Google answers
Elastic0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
Vespa.ai0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
See every answer about vector search platforms
5 answers
Asked ChatGPT
“Which vector search platform should I use?”
Asked ChatGPT
“What are the best vector search platforms?”
Asked ChatGPT
“What's the best vector search platform for ai search apps?”
Searched Google, AI Overview
“best vector search”
Searched Google, AI Overview
“vector search engine”
Brands are shown in the order each answer named them. The survey took place in the United States on October 21, 2026.
Is pgvector or Vespa.ai more popular in search?
This chart shows how often people search Google for pgvector and Vespa.ai by name. Each line represents a brand's share of searches for all eight vector search platforms we track, month by month, from English-language searches worldwide.
Share of searches by month for pgvector, Vespa.ai. The figures are in the table below the chart.
View monthly share of searches table
| Month | Qdrant | Pinecone | pgvector | Milvus | Weaviate | Chroma | Elastic | Vespa.ai |
|---|---|---|---|---|---|---|---|---|
| Oct 2025 | 34.3% | 4.9% | 14.1% | 23.3% | 12.5% | 6.3% | 3.4% | 1.2% |
| Nov 2025 | 34.2% | 4.7% | 14.1% | 23.3% | 12.4% | 6.3% | 3.4% | 1.6% |
| Dec 2025 | 37.2% | 6.2% | 15.3% | 20.7% | 10.9% | 5.6% | 3.1% | 1.1% |
| Jan 2026 | 35.8% | 8.5% | 14.7% | 20.4% | 10.5% | 5.4% | 3.6% | 1% |
| Feb 2026 | 35.1% | 12.1% | 14.2% | 19.2% | 10.3% | 5.2% | 2.9% | 0.98% |
| Mar 2026 | 34.6% | 14.6% | 14.2% | 19.3% | 8.5% | 5.2% | 2.9% | 0.81% |
| Apr 2026 | 33.6% | 13.9% | 16.6% | 18.4% | 8.1% | 6.1% | 2.7% | 0.79% |
| May 2026 | 32.9% | 16.6% | 16.2% | 18% | 7.9% | 4.9% | 2.7% | 0.92% |
| Jun 2026 | 37.9% | 19% | 15.3% | 14.2% | 6.2% | 4.6% | 2% | 0.76% |
| Jul 2026 | 36.3% | 18.2% | 14.7% | 16.2% | 6.1% | 5.4% | 2.4% | 0.83% |
| Aug 2026 | 32.3% | 19.7% | 15.9% | 17.3% | 6.4% | 4.8% | 2.6% | 0.9% |
| Sep 2026 | 34% | 20.9% | 16.8% | 14.7% | 5.5% | 5% | 2.2% | 0.92% |
How has the pgvector and Vespa.ai comparison changed over the last 12 months?
3 findings
- pgvector was ahead of Vespa.ai in every measured month of the 12 months ending September 2026.
- Across the 12 months ending September 2026, pgvector’s share of searches among vector search platforms worldwide moved from 14.1% to 16.8%, and its estimated monthly branded searches held steady at 27.1K.
- Across the 12 months ending September 2026, Vespa.ai’s share of searches among vector search platforms worldwide moved from 1.2% to 0.92%, and its estimated monthly branded searches moved from 2.2K to 1.5K.
How did search popularity change for vector search platforms worldwide in September 2026?
2 changes
In September 2026, pgvector overtook Milvus to rank 3rd among vector search platforms worldwide, with 16.8% of the searches.
Estimated monthly branded searches for Vespa.ai worldwide fell 33.5% over 12 measured months, from 2.2K to 1.5K in September 2026.
How are branded searches counted?
4 search terms
Brandwave collects information about searches that people make online using pgvector’s and Vespa.ai’s names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading.
Other head-to-heads among vector search platforms
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