Braintrust vs Langchain: who uses which
Customers, public proof and the companies that use both.
On usedby, 39 companies use Braintrust and 32 use Langchain. No company is listed with both yet. Braintrust leads among the DevTools & Infrastructure companies on usedby that use either tool, Langchain among the HR & Recruiting companies.Latest check Oct 7, 2026: 71 of 71 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 Braintrust, Langchain, or both
Every company with a public proof for at least one of the two tools.
39
use only Braintrust
0
companies use both
32
use only Langchain
39 companies use only Braintrust, 32 use only Langchain and 0 use both, out of the 71 companies on usedby that use at least one of them.
Where it lands
Newest customers
We have not started tracking changes for Braintrust yet.
Where it lands
Newest customers
No new customer since tracking started on October 3, 2026.
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 Braintrust, Langchain or both: a share of the companies on usedby, not of the market.
Braintrust onlyBothLangchain only
More common with Braintrust
- DevTools & Infrastructure10 of the 11 DevTools & Infrastructure companies on usedby that use either tool use Braintrust.
- Fintech & Payments4 of the 7 Fintech & Payments companies on usedby that use either tool use Braintrust.
More common with Langchain
- HR & Recruiting4 of the 5 HR & Recruiting companies on usedby that use either tool use Langchain.
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.
BraintrustLangchainWhat customers report
Results as the vendor or the customer published them, with the source and the date.
Braintrust
Continuous signal, 30-min fix cycles
Rex
Vendor case study, braintrust.dev, captured Oct 6, 2026
Langchain
No reviewed story for Langchain yet.
Questions about Braintrust and Langchain
Which is used more, Braintrust or Langchain?
Braintrust has more customers on usedby: 39 against 32 for Langchain. Braintrust leads among the DevTools & Infrastructure companies on usedby that use either tool, Langchain among the HR & Recruiting companies.
Do companies use both Braintrust and Langchain?
usedby has not found a company with a confirmed or observed line on both Braintrust and Langchain yet.
Who uses Braintrust?
39 companies on usedby, each with the public page that shows it. See who uses Braintrust.
Who uses Langchain?
32 companies on usedby, each with the public page that shows it. See who uses Langchain.
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.