# AgentMail vs Braintrust: who uses which

On usedby, 13 companies use AgentMail and 44 use Braintrust. 2 companies use both, including Replit and Eve. Counts include every proof level, job-post signals included; each company keeps its proof level on each side. Latest check 2026-10-25: 57 of 57 public lines checked.

## Side by side

|  | [AgentMail](https://www.usedby.ai/tools/agentmail.md) | [Braintrust](https://www.usedby.ai/tools/braintrust.md) |
|---|---|---|
| Public customers | 13 | 44 |
| Confirmed | 0 | 13 |
| Observed | 13 | 30 |
| Signals (job posts) | 0 | 1 |
| Top industries of customers (every proof level) | DevTools & Infrastructure (2), Sales Tech & CRM (2), Artificial Intelligence (1) | DevTools & Infrastructure (12), Artificial Intelligence (5), Fintech & Payments (5) |
| Category | Agent frameworks & AI gateways | LLM observability & evals |
| Security | — | SOC 2 Type II ([trust.braintrust.dev](https://trust.braintrust.dev/), checked 2026-10-22) |
| Data processing terms | — | A data processing agreement is available. ([braintrust.dev](https://www.braintrust.dev/legal/dpa), checked 2026-10-22) |
| Free trial | — | Free trial or free plan available. ([braintrust.dev](https://www.braintrust.dev/pricing), checked 2026-10-22) |
| Integrations | — | Vercel AI SDK, Claude Agent SDK, OpenAI Agents SDK, LlamaIndex, CrewAI, LangChain, LangGraph, OpenTelemetry, Mastra, Pydantic AI, DSPy, Pytest ([braintrust.dev](https://www.braintrust.dev/docs/integrations), checked 2026-10-22) |
| Pricing | — | Starter: $0 / month; Pro: $249 / month; Enterprise: contact sales ([braintrust.dev](https://www.braintrust.dev/pricing), checked 2026-10-22) |

## Companies that use both

Every proof level counts; the proof level of each side is shown, strongest proofs first. The first public proof is not an adoption date.

| Company | Proof, AgentMail | Proof, Braintrust | First public proof, Braintrust |
|---|---|---|---|
| [Replit](https://www.usedby.ai/companies/replit.md) | Observed | Observed | On or before April 2025 |
| [Eve](https://www.usedby.ai/companies/eve.md) | Observed | Confirmed | On or before August 2026 |

## Published results

Reviewed stories only; usedby did not measure the figures.

- Braintrust: [Browserbase](https://www.usedby.ai/case-studies/browserbase-braintrust.md): **100,000s**: “100,000s of public eval dashboard views” (captured by usedby 2026-10-09)
- Braintrust: [Rex](https://www.usedby.ai/case-studies/rex-braintrust.md): **30-min**: “Continuous signal, 30-min fix cycles” (captured by usedby 2026-10-06)

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Source: https://www.usedby.ai/compare/agentmail-vs-braintrust · How we check: https://www.usedby.ai/methodology