Agent Evaluation / Agent Tracing
The Best LangSmith Alternatives
Compare LangSmith alternatives by when to choose each option, when it is not ideal, and what to consider before switching.
When to consider an alternative
Use LangSmith when agent quality needs an operating loop, not just ad hoc debugging screenshots.
Last reviewed
June 23, 2026
Alternatives reviewed
3
Alternative tools
Langfuse
Best when teams want self-hostable observability with datasets, scores, and prompt management in one stack.
Choose Langfuse if...
- self-hosted agent tracing
- production eval loops
- prompt versioning with traces
Not ideal if...
- teams that only need a hosted LangChain-native workflow
- projects with no appetite to operate observability infrastructure
Arize Phoenix
Best when the team needs observability that connects prompt debugging, agent traces, and evaluation in one open-source tool.
Choose Arize Phoenix if...
- agent tracing
- LLM observability
- evals
Not ideal if...
- teams that already have a paid observability contract
- projects where traces are only needed for debugging, not evaluation
Braintrust
Best when product and engineering teams need fast experiment comparison across prompts, models, and tool paths.
Choose Braintrust if...
- experiment-driven agent iteration
- LLM-as-judge eval workflows
- cross-team quality review
Not ideal if...
- teams that only need lightweight trace viewing
- workloads that cannot use a hosted eval platform
What to consider
- Does the alternative solve the same agent layer, or is it a lower-level building block?
- Will switching improve observability, permission boundaries, state control, or evaluation coverage?
- Can the team validate the migration with one real agent task before replacing the current tool?