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A data-grounded look at how these two coding & development tools stack up — to help you pick the right coding & development tool in 2026.
Quick verdict
There's barely a point between Keploy and LangSmith on our Editor Score. Pick Keploy if you want eBPF traffic capture with zero code changes; choose LangSmith for step-by-step agent tracing and debugging. On pricing, each has a free or freemium plan, so cost isn't the deciding factor here.
| Pricing | Freemium | Freemium |
| Free tier | ||
| Best for | eBPF traffic capture with zero code changes | step-by-step agent tracing and debugging |
Open-source AI testing from real API traffic
Observability and evaluation for LLM agents
Choose Keploy if…
Choose LangSmith if…
It comes down to fit, not a single winner: Keploy leans into eBPF traffic capture with zero code changes, while LangSmith is built for step-by-step agent tracing and debugging. Weigh features and pricing for your workflow. Both have a free or freemium tier, so spin up each and keep the one that clicks.
Neither is universally better — it depends on your budget and which features matter most. The side-by-side breakdown above shows where each one wins.
Keploy (freemium) is best for eBPF traffic capture with zero code changes, while LangSmith (freemium) is best for step-by-step agent tracing and debugging. See the full feature and pricing comparison above.
Both have paid plans — pricing depends on your usage tier. Open each tool's review for current prices, and watch for free trials.
Keploy is usually the easier starting point thanks to a lower barrier to entry. Beginners should favour a free tier and a simple interface over raw power.
Other head-to-heads in the same category.
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Daniel reviews AI tools the slow way — by actually using them on real projects. His reviews cover what works, what breaks, and who each tool is genuinely a good fit for.
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Last updated August 2026. Comparisons are ranked by our Editor Score (features, value and pricing, blended with verified user reviews where a tool has them) — see our methodology.