# LLM Ops & Frameworks: the tools companies use

257 companies on usedby use at least one of the 14 tools in this category with a public customer. LangSmith leads with 43 companies. Counts are of companies on usedby, not of the whole market. Latest check 2026-10-07: 295 of 307 public lines checked.

> Tools to orchestrate, observe, and deploy LLM applications

Family: [Engineering & Data](https://www.usedby.ai/tools/category/engineering-data.md)

## Ranking

Public customers count every public line, job-post signals included; ties share a rank.

| Rank | Tool | Public customers | Confirmed | Observed | Signals |
|---|---|---|---|---|---|
| 1 | [LangSmith](https://www.usedby.ai/tools/langsmith.md) | 43 | 11 | 31 | 1 |
| 2 | [Braintrust](https://www.usedby.ai/tools/braintrust.md) | 39 | 15 | 24 | 0 |
| 3 | [Arize AI](https://www.usedby.ai/tools/arize-ai.md) | 35 | 9 | 26 | 0 |
| 4 | [Langchain](https://www.usedby.ai/tools/langchain.md) | 32 | 13 | 16 | 3 |
| 5 | [TrueFoundry](https://www.usedby.ai/tools/truefoundry.md) | 27 | 23 | 4 | 0 |
| 6 | [E2B](https://www.usedby.ai/tools/e2b.md) | 23 | 15 | 8 | 0 |
| 7 | [Portkey](https://www.usedby.ai/tools/portkey.md) | 22 | 12 | 10 | 0 |
| 8 | [Comet Opik](https://www.usedby.ai/tools/comet-opik.md) | 17 | 13 | 4 | 0 |
| 9 | [Mem0](https://www.usedby.ai/tools/mem0.md) | 16 | 0 | 16 | 0 |
| 10 | [CrewAI](https://www.usedby.ai/tools/crewai.md) | 13 | 8 | 5 | 0 |
| 10 | [Flowise](https://www.usedby.ai/tools/flowise.md) | 13 | 2 | 11 | 0 |
| 10 | [Galileo](https://www.usedby.ai/tools/galileo.md) | 13 | 8 | 5 | 0 |
| 13 | [Fiddler AI](https://www.usedby.ai/tools/fiddler-ai.md) | 10 | 1 | 9 | 0 |
| 14 | [Contextual AI](https://www.usedby.ai/tools/contextual-ai.md) | 4 | 2 | 2 | 0 |

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Source: https://www.usedby.ai/tools/category/llm-ops-frameworks · How we check: https://www.usedby.ai/methodology