AI Observability Tools pricing across 6 tracked products: entry-tier median $0, top-tier median $1,000. Cheapest: Arize Phoenix. Most premium: LangSmith. Updated April 2026.
AI observability (tracing, evals, guardrails) uses usage-based pricing on traces plus seat fees. Teams typically pay $50-300/user/month on team tiers.
Entry-tier median is $0, top-tier median $1,000. Negotiated enterprise deals typically land 15-40% below list.
| Product | Entry | Median | Top | Unit |
|---|---|---|---|---|
| Arize Phoenix | $0 | $50 | $1,000 | month |
| Braintrust | $0 | $249 | $1,000 | month |
| Helicone | $0 | $79 | $2,000 | month |
| Humanloop | $0 | $0 | $0 | month |
| Langfuse | $0 | $199 | $2,499 | month |
| LangSmith | $0 | $39 | $500 | month |
Low is the entry-tier price (often a free or starter plan). Median is the middle price across published tiers. High is the top published tier — enterprise contracts with negotiated discounts usually land 15-40% below the published high.
Across 6 tracked products, the entry-tier median is $0 and the top-tier median is $1,000. Individual products vary significantly — see the per-product table above.
Arize Phoenix has the lowest entry-tier price in our tracked set.
LangSmith has the highest top-tier list price among tracked products.
Prices are sourced from vendor pricing pages and automatically re-checked. Any tier marked 'custom' has no public list price; negotiated deals aren't shown here.