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LLM observability & evals tools used by Technology & Connectivity companies

Each line links its public proof and the date usedby last checked it.

60

Technology & Connectivity companies use LLM observability & evals tools

17 confirmed 43 observed

The most used: Braintrust (23), LangSmith (13), and Galileo (10).Data as of Oct 25, 2026

Ranking

Tools ranked by the Technology & Connectivity companies that use them. Ties go to the stronger proof.

Largest and best-proven users

Two labelled views of the same companies. Neither is a score.

Largest companies

By employee range. Size known for 35 of 60.

  • NTT DataConfirmed10,001+ employeesChecked Oct 21, 2026
  • AT&TObserved10,001+ employeesChecked Oct 25, 2026
  • InfosysObserved10,001+ employeesChecked Oct 25, 2026

Strongest proof

Confirmed or declared: 17 of 60. This view filters what you read, never what is counted.

  • PagerDutyConfirmed1,001–5,000 employeesChecked Oct 25, 2026
  • LG UplusConfirmedChecked Oct 25, 2026
  • BubbleConfirmedChecked Oct 25, 2026

Who uses each tool

Strongest proof first. A job post is a signal, the weakest proof.

  1. 1Braintrust23 companies · Checked Oct 25, 202623
    9 confirmed 14 observed

    Braintrust profile

    Show 13 more companies
  2. 2LangSmith13 companies · Checked Oct 23, 202613
    0 confirmed 13 observed

    LangSmith profile

    Show 3 more companies
  3. 3Galileo10 companies · Checked Oct 6, 202610
    0 confirmed 10 observed

    Galileo profile

  4. 4Arize AI9 companies · Checked Oct 25, 20269
    2 confirmed 7 observed

    Arize AI profile

  5. 5Comet Opik7 companies · Checked Oct 21, 20267
    5 confirmed 2 observed

    Comet Opik profile

  6. 6Fiddler AI2 companies · Checked Oct 6, 20262
    1 confirmed 1 observed

    Fiddler AI profile

How usedby counts

17 confirmed 43 observed

A company counts once per tool, at its strongest proof: confirmed (a case study, a named testimonial, a press release or the company's own account), declared (the company told usedby), observed (a vendor logo wall or customers page) or signal (a job post). Counts cover the companies on usedby, never the whole market.

No software vendor had to be left out.

Data as of October 25, 2026.

Questions

Which LLM observability & evals tools do Technology & Connectivity companies use most?

Braintrust leads: 23 of the 60 Technology & Connectivity companies on usedby that use LLM observability & evals tools use it. Next: LangSmith (13), Galileo (10), Arize AI (9), and Comet Opik (7). See Braintrust.

How many Technology & Connectivity companies use LLM observability & evals tools?

60 Technology & Connectivity companies on usedby use at least one of 6 LLM observability & evals tools. It counts the companies usedby tracks.

What proof backs these lines?

Of the 60 companies, each counted at its strongest proof: 17 confirmed, 0 declared, 43 observed and 0 known from a job post.

How does usedby build this ranking?

usedby counts each Technology & Connectivity company once per tool, from public proof: case studies, press releases, the company's own site or its declaration to usedby, vendor customer pages and job posts. Every line shows its proof and the date usedby last checked it.

LLM observability & evals in other industries

LLM observability & evals by industry within Technology & Connectivity