# LLM observability & evals tools used by Technology & Connectivity companies

usedby lists 60 Technology & Connectivity companies using 6 LLM observability & evals tools. The most used is Braintrust: 23 of the 60 Technology & Connectivity companies on usedby, every proof level counted. These are counts of the companies usedby tracks, not a market share. Data as of 2026-10-25.

## 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.

| Company | Proof | Employees | Tools | Last check |
|---|---|---|---|---|
| [NTT Data](https://www.usedby.ai/companies/ntt-data.md) | Confirmed | 10,001+ | Comet Opik | 2026-10-21 |
| [AT&T](https://www.usedby.ai/companies/att.md) | Observed | 10,001+ | Arize AI | 2026-10-25 |
| [Infosys](https://www.usedby.ai/companies/infosys.md) | Observed | 10,001+ | Arize AI | 2026-10-25 |

### Strongest proof

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

| Company | Proof | Employees | Tools | Last check |
|---|---|---|---|---|
| [PagerDuty](https://www.usedby.ai/companies/pagerduty.md) | Confirmed | 1,001–5,000 | Arize AI | 2026-10-25 |
| [LG Uplus](https://www.usedby.ai/companies/lg-uplus.md) | Confirmed | Unknown | Arize AI | 2026-10-25 |
| [Bubble](https://www.usedby.ai/companies/bubble.md) | Confirmed | Unknown | Braintrust | 2026-10-25 |

## Ranking

Tools ranked by the companies of the 60 Technology & Connectivity companies on usedby that use them. Each company counts once per tool, at its strongest proof. Ties go to more confirmed, then declared, then observed companies.

| # | Tool | Companies | Confirmed | Declared | Observed | Job posts only | Last check |
|---|---|---|---|---|---|---|---|
| 1 | [Braintrust](https://www.usedby.ai/tools/braintrust.md) | 23 | 9 | 0 | 14 | 0 | 2026-10-25 |
| 2 | [LangSmith](https://www.usedby.ai/tools/langsmith.md) | 13 | 0 | 0 | 13 | 0 | 2026-10-23 |
| 3 | [Galileo](https://www.usedby.ai/tools/galileo.md) | 10 | 0 | 0 | 10 | 0 | 2026-10-06 |
| 4 | [Arize AI](https://www.usedby.ai/tools/arize-ai.md) | 9 | 2 | 0 | 7 | 0 | 2026-10-25 |
| 5 | [Comet Opik](https://www.usedby.ai/tools/comet-opik.md) | 7 | 5 | 0 | 2 | 0 | 2026-10-21 |
| 6 | [Fiddler AI](https://www.usedby.ai/tools/fiddler-ai.md) | 2 | 1 | 0 | 1 | 0 | 2026-10-06 |

## Customers per tool

Every line is a customer, at one of three proof levels: confirmed (a case study, a named quote, a press release, or the company's own public account of using the tool (its own site, or a post by one of its executives, VP or above)), observed (the vendor shows the company on its own pages) or signal (a job post shows the company's employees use the tool, the weakest proof). A line the company declared to usedby itself, or that it lists as a sub-processor on its own legal page, is marked declared. A signal is never a case study or a vendor listing. Strongest proof first. "Last check" is the later of the line's re-verification and its latest capture.

| Tool | Company | Proof | Source | Last check |
|---|---|---|---|---|
| Braintrust | [Cloudflare](https://www.usedby.ai/companies/cloudflare.md) | Confirmed | [braintrust.dev](https://www.braintrust.dev/customers/cloudflare), captured 2026-10-06 | 2026-10-25 |
| Braintrust | [Dropbox](https://www.usedby.ai/companies/dropbox.md) | Confirmed | [braintrust.dev](https://www.braintrust.dev/customers/notion), captured 2026-10-25 | 2026-10-25 |
| Braintrust | [Notion](https://www.usedby.ai/companies/notion.md) | Confirmed | [braintrust.dev](https://www.braintrust.dev/customers/notion), captured 2026-10-25 | 2026-10-25 |
| Braintrust | [Retool](https://www.usedby.ai/companies/retool.md) | Confirmed | [braintrust.dev](https://www.braintrust.dev/customers/retool), captured 2026-10-06 | 2026-10-25 |
| Braintrust | [Box](https://www.usedby.ai/companies/box.md) | Confirmed | [braintrust.dev](https://www.braintrust.dev/customers/notion), captured 2026-10-25 | 2026-10-25 |
| Braintrust | [Browserbase](https://www.usedby.ai/companies/browserbase.md) | Confirmed | [braintrust.dev](https://www.braintrust.dev/customers/browserbase), captured 2026-10-09 | 2026-10-25 |
| Braintrust | [Bubble](https://www.usedby.ai/companies/bubble.md) | Confirmed | [braintrust.dev](https://www.braintrust.dev/customers/bubble), captured 2026-10-25 | 2026-10-25 |
| Braintrust | [Rex](https://www.usedby.ai/companies/rex.md) | Confirmed | [braintrust.dev](https://www.braintrust.dev/customers/rex), captured 2026-10-06 | 2026-10-25 |
| Braintrust | [Graphite](https://www.usedby.ai/companies/graphite.md) | Confirmed | [braintrust.dev](https://www.braintrust.dev/customers/graphite), captured 2026-10-06 | 2026-10-25 |
| Braintrust | [MongoDB](https://www.usedby.ai/companies/mongodb.md) | Observed | [braintrust.dev](https://www.braintrust.dev/pricing), captured 2026-10-25 | 2026-10-25 |
| Braintrust | [Airtable](https://www.usedby.ai/companies/airtable.md) | Observed | [braintrust.dev](https://www.braintrust.dev/pricing), captured 2026-10-25 | 2026-10-25 |
| Braintrust | [Mixpanel](https://www.usedby.ai/companies/mixpanel.md) | Observed | [braintrust.dev](https://www.braintrust.dev/pricing), captured 2026-10-25 | 2026-10-25 |
| Braintrust | [Vercel](https://www.usedby.ai/companies/vercel.md) | Observed | [braintrust.dev](https://www.braintrust.dev/pricing), captured 2026-10-25 | 2026-10-25 |
| Braintrust | [Replit](https://www.usedby.ai/companies/replit.md) | Observed | [braintrust.dev](https://www.braintrust.dev/pricing), captured 2026-10-25 | 2026-10-25 |
| Braintrust | [Augment Code](https://www.usedby.ai/companies/augment-code.md) | Observed | [braintrust.dev](https://www.braintrust.dev/pricing), captured 2026-10-25 | 2026-10-25 |
| Braintrust | [Dialpad](https://www.usedby.ai/companies/dialpad.md) | Observed | [braintrust.dev](https://www.braintrust.dev/pricing), captured 2026-10-25 | 2026-10-25 |
| Braintrust | [Greptile](https://www.usedby.ai/companies/greptile.md) | Observed | [braintrust.dev](https://www.braintrust.dev/pricing), captured 2026-10-25 | 2026-10-25 |
| Braintrust | [Semgrep](https://www.usedby.ai/companies/semgrep.md) | Observed | [braintrust.dev](https://www.braintrust.dev/pricing), captured 2026-10-25 | 2026-10-25 |
| Braintrust | [Suno](https://www.usedby.ai/companies/suno.md) | Observed | [braintrust.dev](https://www.braintrust.dev/pricing), captured 2026-10-25 | 2026-10-25 |
| Braintrust | [Superhuman](https://www.usedby.ai/companies/superhuman.md) | Observed | [braintrust.dev](https://www.braintrust.dev/pricing), captured 2026-10-25 | 2026-10-25 |
| Braintrust | [Tolan](https://www.usedby.ai/companies/tolan.md) | Observed | [braintrust.dev](https://www.braintrust.dev/customers), captured 2026-10-25 | 2026-10-25 |
| Braintrust | [Granola](https://www.usedby.ai/companies/granola.md) | Observed | [braintrust.dev](https://www.braintrust.dev/pricing), captured 2026-10-25 | 2026-10-25 |
| Braintrust | [Lovable](https://www.usedby.ai/companies/lovable.md) | Observed | [braintrust.dev](https://www.braintrust.dev/pricing), captured 2026-10-25 | 2026-10-25 |
| LangSmith | [Nvidia](https://www.usedby.ai/companies/nvidia.md) | Observed | [langchain.com](https://www.langchain.com/langsmith/observability), captured 2026-10-23 | 2026-10-23 |
| LangSmith | [Cisco](https://www.usedby.ai/companies/cisco.md) | Observed | [langchain.com](https://www.langchain.com/customers), captured 2026-10-23 | 2026-10-23 |
| LangSmith | [Autodesk](https://www.usedby.ai/companies/autodesk.md) | Observed | [langchain.com](https://www.langchain.com/langsmith/observability), captured 2026-10-23 | 2026-10-23 |
| LangSmith | [ServiceNow](https://www.usedby.ai/companies/servicenow.md) | Observed | [langchain.com](https://www.langchain.com/langsmith/observability), captured 2026-10-23 | 2026-10-23 |
| LangSmith | [Elastic](https://www.usedby.ai/companies/elastic.md) | Observed | [langchain.com](https://www.langchain.com/langsmith/observability), captured 2026-10-23 | 2026-10-23 |
| LangSmith | [GitLab](https://www.usedby.ai/companies/gitlab.md) | Observed | [langchain.com](https://www.langchain.com/langsmith/customers) | Not dated |
| LangSmith | [Vanta](https://www.usedby.ai/companies/vanta.md) | Observed | [langchain.com](https://www.langchain.com/langsmith/observability), captured 2026-10-23 | 2026-10-23 |
| LangSmith | [Cogent](https://www.usedby.ai/companies/cogent.md) | Observed | [langchain.com](https://www.langchain.com/langsmith/observability), captured 2026-10-23 | 2026-10-23 |
| LangSmith | [Exa](https://www.usedby.ai/companies/exa.md) | Observed | [langchain.com](https://www.langchain.com/langsmith/observability), captured 2026-10-23 | 2026-10-23 |
| LangSmith | [Factory](https://www.usedby.ai/companies/factory.md) | Observed | [langchain.com](https://www.langchain.com/customers), captured 2026-10-23 | 2026-10-23 |
| LangSmith | [Harmonic](https://www.usedby.ai/companies/harmonic.md) | Observed | [langchain.com](https://www.langchain.com/langsmith/observability), captured 2026-10-23 | 2026-10-23 |
| LangSmith | [Listen](https://www.usedby.ai/companies/listen.md) | Observed | [langchain.com](https://www.langchain.com/langsmith/observability), captured 2026-10-23 | 2026-10-23 |
| LangSmith | [Serval](https://www.usedby.ai/companies/serval.md) | Observed | [langchain.com](https://www.langchain.com/langsmith/observability), captured 2026-10-23 | 2026-10-23 |
| Galileo | [Nvidia](https://www.usedby.ai/companies/nvidia.md) | Observed | [galileo.ai](https://galileo.ai/), captured 2026-10-06 | 2026-10-06 |
| Galileo | [Cisco](https://www.usedby.ai/companies/cisco.md) | Observed | [galileo.ai](https://galileo.ai/), captured 2026-10-06 | 2026-10-06 |
| Galileo | [HP](https://www.usedby.ai/companies/hp.md) | Observed | [galileo.ai](https://galileo.ai/), captured 2026-10-06 | 2026-10-06 |
| Galileo | [Comcast](https://www.usedby.ai/companies/comcast.md) | Observed | [galileo.ai](https://galileo.ai/case-studies), captured 2026-10-06 | 2026-10-06 |
| Galileo | [MongoDB](https://www.usedby.ai/companies/mongodb.md) | Observed | [galileo.ai](https://galileo.ai/), captured 2026-10-06 | 2026-10-06 |
| Galileo | [Twilio](https://www.usedby.ai/companies/twilio.md) | Observed | [galileo.ai](https://galileo.ai/case-studies), captured 2026-10-06 | 2026-10-06 |
| Galileo | [Five9](https://www.usedby.ai/companies/five9.md) | Observed | [galileo.ai](https://galileo.ai/), captured 2026-10-06 | 2026-10-06 |
| Galileo | [CrewAI](https://www.usedby.ai/companies/crewai.md) | Observed | [galileo.ai](https://galileo.ai/), captured 2026-10-06 | 2026-10-06 |
| Galileo | [NTT](https://www.usedby.ai/companies/ntt.md) | Observed | [galileo.ai](https://galileo.ai/), captured 2026-10-06 | 2026-10-06 |
| Galileo | [Satisfi Labs](https://www.usedby.ai/companies/satisfi-labs.md) | Observed | [galileo.ai](https://galileo.ai/), captured 2026-10-06 | 2026-10-06 |
| Arize AI | [PagerDuty](https://www.usedby.ai/companies/pagerduty.md) | Confirmed | [arize.com](https://arize.com/customers/pagerduty-ai-agent-quality-monitoring/), captured 2026-10-16 | 2026-10-25 |
| Arize AI | [LG Uplus](https://www.usedby.ai/companies/lg-uplus.md) | Confirmed | [arize.com](https://arize.com/customers/how-lg-uplus-is-building-better-agents-with-evaluation-driven-development-and-arize-ax/), captured 2026-10-16 | 2026-10-25 |
| Arize AI | [Microsoft](https://www.usedby.ai/companies/microsoft.md) | Observed | [arize.com](https://arize.com/customers) | Not dated |
| Arize AI | [AT&T](https://www.usedby.ai/companies/att.md) | Observed | [arize.com](https://arize.com/customers/), captured 2026-10-25 | 2026-10-25 |
| Arize AI | [Atlassian](https://www.usedby.ai/companies/atlassian.md) | Observed | [arize.com](https://arize.com/customers/), captured 2026-10-25 | 2026-10-25 |
| Arize AI | [Infosys](https://www.usedby.ai/companies/infosys.md) | Observed | [arize.com](https://arize.com/customers/), captured 2026-10-25 | 2026-10-25 |
| Arize AI | [Cohere](https://www.usedby.ai/companies/cohere.md) | Observed | [arize.com](https://arize.com/customers) | Not dated |
| Arize AI | [LG U+](https://www.usedby.ai/companies/lg-u.md) | Observed | [arize.com](https://arize.com/customers/), captured 2026-10-25 | 2026-10-25 |
| Arize AI | [Snorkel AI](https://www.usedby.ai/companies/snorkel-ai.md) | Observed | [arize.com](https://arize.com/customers/), captured 2026-10-25 | 2026-10-25 |
| Comet Opik | [NTT Data](https://www.usedby.ai/companies/ntt-data.md) | Confirmed | [comet.com](https://www.comet.com/site/customers/ntt-data-group/), captured 2026-10-07 | 2026-10-21 |
| Comet Opik | [Ancestry](https://www.usedby.ai/companies/ancestry.md) | Confirmed | [comet.com](https://www.comet.com/site/customers/ancestry/), captured 2026-10-07 | 2026-10-21 |
| Comet Opik | [AssemblyAI](https://www.usedby.ai/companies/assemblyai.md) | Confirmed | [comet.com](https://www.comet.com/site/customers/assemblyai/), captured 2026-10-07 | 2026-10-21 |
| Comet Opik | [Pento.ai](https://www.usedby.ai/companies/pento-ai.md) | Confirmed | [comet.com](https://www.comet.com/site/customers/pentoai/), captured 2026-10-07 | 2026-10-21 |
| Comet Opik | [Zencoder](https://www.usedby.ai/companies/zencoder.md) | Confirmed | [comet.com](https://www.comet.com/site/customers/zencoder-ai-code-generator/), captured 2026-10-07 | 2026-10-21 |
| Comet Opik | [Autodesk](https://www.usedby.ai/companies/autodesk.md) | Observed | [comet.com](https://www.comet.com/site/), captured 2026-10-21 | 2026-10-21 |
| Comet Opik | [Stability AI](https://www.usedby.ai/companies/stability-ai.md) | Observed | [comet.com](https://www.comet.com/site/), captured 2026-10-21 | 2026-10-21 |
| Fiddler AI | [Nielsen](https://www.usedby.ai/companies/nielsen.md) | Confirmed | [fiddler.ai](https://www.fiddler.ai/customers/leading-financial-services-institution), captured 2026-10-06 | 2026-10-06 |
| Fiddler AI | [Curinos](https://www.usedby.ai/companies/curinos.md) | Observed | [fiddler.ai](https://www.fiddler.ai/), captured 2026-10-06 | 2026-10-06 |

## Method

Public customer lines of active LLM observability & evals tools at companies classified in Technology & Connectivity. No software vendor had to be left out. Company mix by strongest proof: 17 confirmed, 0 declared, 43 observed and 0 signals.

## 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).

### 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 by industry within Technology & Connectivity: [DevTools & Infrastructure](https://www.usedby.ai/companies/industry/devtools-infrastructure/llm-observability-evals.md) (17) · [Artificial Intelligence](https://www.usedby.ai/companies/industry/artificial-intelligence/llm-observability-evals.md) (15)

Industry page: https://www.usedby.ai/companies/industry/technology-connectivity.md · Category page: https://www.usedby.ai/tools/category/llm-observability-evals.md

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Source: https://www.usedby.ai/companies/industry/technology-connectivity/llm-observability-evals · How we check: https://www.usedby.ai/methodology