LangSmith alternatives (2026): Best tools for LLM tracing, evals, and prompt iteration

Braintrust is positioned as a leading alternative to LangSmith for production teams that require comprehensive evaluation-to-production workflows with integrated CI/CD quality gates, structured evaluations, and controlled release mechanisms. Unlike LangSmith, which is tightly integrated with LangChain, Braintrust offers broader framework compatibility, allowing teams to utilize their existing infrastructure without needing to adopt specific orchestration frameworks. It converts production failures into regression tests and ensures evaluation results directly influence release decisions, thus preventing regressions from reaching users. While LangSmith provides visibility into model performance, it relies on manual review to act on evaluation results. In contrast, Braintrust enforces quality standards automatically before deployment, facilitating collaboration between product and engineering teams within the same environment and offering a shared playground for testing prompt changes. This approach is favored by companies such as Notion and Stripe, which have improved their issue identification and resolution capabilities by employing Braintrust's workflow. Braintrust’s model supports unlimited collaborators in its free tier, providing cost-effective scaling for teams focused on enhancing evaluation practices.