Braintrust vs PromptLens
Braintrust
braintrust.devPromptLens
promptlens.ioSide by side
| Figure | Braintrust | PromptLens |
|---|---|---|
| Price from | $249/mo | $99/mo |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | — |
| Self-hosted | Yes | — |
| Plans published | 4 | 3 |
| Spec score · Prompt Management Software | 9.2 (#2) | 7.8 (#16) |
| Spec score · AI Prompt Management Software | 9.2 (#2) | 7.8 (#16) |
| Observability | The platform captures agent traces, prompts, responses and tool calls, with search across logs plus latency, cost and quality tracking. | The site says its observability product traces production model calls, tools, and retrieval, including timing, errors, usage, and cost. |
| Security | Braintrust states that it is SOC 2 Type II certified and GDPR and HIPAA compliant, and offers SSO, RBAC, and hybrid deployment options. | The privacy policy says sensitive data is encrypted at rest, data is transmitted over HTTPS, and access to user data is restricted to authorized personnel. |
| Support | The pricing page lists community support, priority support, and shared Slack channel support across its plans. | The Free plan includes email support, Pro includes priority email support, and Teams includes dedicated support. |
| What it does | Braintrust is an observability and evaluation platform for instrumenting, understanding and improving AI agents in production. | PromptLens provides prompt management, evaluations, and observability for teams shipping production LLM workflows. |
Plans
In their own words
Braintrust
Braintrust is an observability platform for teams running AI agents in production. It lets teams inspect agent traces and tool calls while tracking latency, cost, and quality in real time. Users can evaluate datasets, compare prompts and models, and score outputs with LLMs, code, or human reviewers. Discovery tools surface patterns in production traces to help investigate agent behavior, and the Loop agent can run evaluations, generate test cases, and iterate on prompts autonomously. Braintrust lists native SDKs for Python, TypeScript, Go, Ruby, C#, and more, and its MCP server lets coding agents query logs, run evaluations, and update prompts from an IDE. Security options listed include SSO, RBAC, and hybrid deployment; Braintrust states that it is SOC 2 Type II certified and GDPR and HIPAA compliant. Starter is free, with 1 GB processed data, 10,000 scores, and 14-day retention. Pro costs $249.00 per month; Enterprise pricing is custom.
PromptLens
PromptLens has no write-up on Specifiction yet; its figures are above.