LangSmith's own row in our catalog: LangSmith Developer plan: 5,000 base traces/month (14-day retention), 1 seat, core tracing + evals. Verified 2026-09-16. Full caveats.
Free API paths in our catalog from other providers:
Langfuse Cloud Hobby plan (Langfuse): 50,000 units/month, 30-day data access, 2 users, all platform features with limits. Verified 2026-09-16. Full caveats.
Braintrust Starter plan (Braintrust): $10 model credits/month, 1 GB processed data/month, 10K scores/month, 14-day data retention, unlimited users, projects, datasets, playgrounds and experiments; no credit card. Verified 2026-09-16. Full caveats.
Inference.net Pay as you go plan (Inference.net): Pay as you go plan at "$0+ usage", including "1M included Gateway requests" and "1M / mo Tracing spans", 14-day data retention, 1 seat, 30 req/min. Verified 2026-10-08. Full caveats.
Not affiliated with LangSmith or any provider named here; names are their owners' marks.