# Braintrust vs Browserbase: who uses which

On usedby, 42 companies use Braintrust and 19 use Browserbase. 3 companies use both, including Ramp, Vercel and Lovable. Counts include every proof level, job-post signals included; each company keeps its proof level on each side. Latest check 2026-10-14: 61 of 61 public lines checked.

## Side by side

|  | [Braintrust](https://www.usedby.ai/tools/braintrust.md) | [Browserbase](https://www.usedby.ai/tools/browserbase.md) |
|---|---|---|
| Public customers | 42 | 19 |
| Confirmed | 12 | 0 |
| Observed | 29 | 19 |
| Signals (job posts) | 1 | 0 |
| Top industries of customers (every proof level) | DevTools & Infrastructure (12), Fintech & Payments (5), Artificial Intelligence (4) | Artificial Intelligence (7), Fintech & Payments (3), Data & Analytics (2) |
| Category | LLM observability & evals | Agent frameworks & AI gateways |
| Security | SOC 2 Type II ([trust.braintrust.dev](https://trust.braintrust.dev/), checked 2026-10-07) | SOC 2 Type II, HIPAA ([trust.browserbase.com](https://trust.browserbase.com/), checked 2026-10-07) |
| Data processing terms | A data processing agreement is available. ([trust.braintrust.dev](https://trust.braintrust.dev/), checked 2026-10-07) | — |
| Free trial | Free trial or free plan available. ([braintrust.dev](https://www.braintrust.dev/pricing), checked 2026-10-07) | Free trial or free plan available. ([browserbase.com](https://www.browserbase.com/pricing), checked 2026-10-07) |
| Integrations | OpenTelemetry, Vercel AI SDK, Claude Agent SDK, OpenAI Agents SDK, LlamaIndex, CrewAI, AgentScope, LangChain, LangSmith, LangGraph ([braintrust.dev](https://www.braintrust.dev/docs/integrations), checked 2026-10-07) | — |
| Pricing | Starter: $0 / month; Pro: $249 / month; Enterprise: contact sales ([braintrust.dev](https://www.braintrust.dev/pricing), checked 2026-10-07) | — |

## 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, Braintrust | Proof, Browserbase | First public proof, Browserbase |
|---|---|---|---|
| [Ramp](https://www.usedby.ai/companies/ramp.md) | Observed | Observed | On or before October 2026 |
| [Vercel](https://www.usedby.ai/companies/vercel.md) | Observed | Observed | On or before February 2026 |
| [Lovable](https://www.usedby.ai/companies/lovable.md) | Observed | Observed | On or before October 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/braintrust-vs-browserbase · How we check: https://www.usedby.ai/methodology