Vespa vs Weaviate: who uses which
Customers, public proof and the companies that use both.
On usedby, 14 companies use Vespa and 60 use Weaviate. No company is listed with both yet. Weaviate leads among the Artificial Intelligence companies on usedby that use either tool.Latest check Oct 7, 2026: 63 of 74 public lines checked. Counts include every proof level, job-post signals included. Companies named on both have a confirmed or observed line on each side.
Who uses Vespa, Weaviate, or both
Every company with a public proof for at least one of the two tools.
14
use only Vespa
0
companies use both
60
use only Weaviate
14 companies use only Vespa, 60 use only Weaviate and 0 use both, out of the 74 companies on usedby that use at least one of them.
Where it lands
Newest customers
No new customer since tracking started on October 7, 2026.
Where it lands
Newest customers
We have not started tracking changes for Weaviate yet.
Who uses both
Companies with a confirmed or observed line on both tools.
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use Vespa, Weaviate or both: a share of the companies on usedby, not of the market.
Vespa onlyBothWeaviate only
More common with Weaviate
- Artificial Intelligence5 of the 6 Artificial Intelligence companies on usedby that use either tool use Weaviate.
- Fintech & Payments5 of the 5 Fintech & Payments companies on usedby that use either tool use Weaviate.
Source: confirmed and observed usedby lines. Job-post signals, the weakest proof level, are left out of these shares.
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
VespaWeaviateWhat customers report
Results as the vendor or the customer published them, with the source and the date.
Vespa
No reviewed story for Vespa yet.
Weaviate
Weaviate outperformed OpenSearch by 20x at scale and with 40% lower operational costs
Booking.com
Vendor case study, weaviate.io, captured Oct 2, 2026
Delegance holds $20M in premium under management across 40 accounts
Delegance
Vendor case study, weaviate.io, captured Oct 2, 2026
Questions about Vespa and Weaviate
Which is used more, Vespa or Weaviate?
Weaviate has more customers on usedby: 60 against 14 for Vespa.
Do companies use both Vespa and Weaviate?
usedby has not found a company with a confirmed or observed line on both Vespa and Weaviate yet.
Who uses Vespa?
14 companies on usedby, each with the public page that shows it. See who uses Vespa.
Who uses Weaviate?
60 companies on usedby, each with the public page that shows it. See who uses Weaviate.
How does usedby count customers?
A company counts when a public page shows it: a vendor's customer page, a case study, a press release or a job post, most saved with a dated capture. Every line is a customer, at one of three proof levels: confirmed, observed or signal (a job post, the weakest). A company is named as using both tools when its lines on both are confirmed or observed.