Compare · llm & agent observability
Arize vs Langfuse pricing
At 1M traces/month: Arize Contact sales, Langfuse $451.
| Arize | Langfuse | |
|---|---|---|
| Free tier | AX Free: 25K spans/month, 1 GB ingestion, 15-day retention. Phoenix OSS is free to self-host. | Hobby: 50K units/month free, no credit card. Self-hosting the MIT-licensed core is free. |
| Billing unit (LLM & agent observability) | spans | units |
| First paid plan | AX Pro: $50/mo | Core: $29/mo |
| Pricing data | Partially published | Published pricing |
| Company status | Acquired | Acquired |
| Open source / self-host | Yes / Yes | Yes / Yes |
| Last checked | 2026-10-19 | 2026-10-19 |
LLM & agent observability: estimated monthly cost
| traces / month | Arize | Langfuse |
|---|---|---|
| 100K | Contact sales | $69.00 Core |
| 1M | Contact sales | $451 Core |
| 10M | Contact sales | $3,931 Core |
Estimate, check vendor page. Figures are list prices computed from publicly posted pricing on the "last checked" date. They exclude taxes, discounts, add-ons, seats and contract terms unless stated. Always confirm on the vendor's own pricing page.
Plans side by side
| Arize | |
|---|---|
| AX Free | $0 25K spans, 1 GB |
| AX Pro | $50/mo 50K spans, 10 GB, 30-day retention |
| AX Enterprise | Contact sales |
| Langfuse | |
|---|---|
| Hobby | $0 50K units/month |
| Core | $29/mo 100K units included, then $8/100K (lower with volume) |
| Pro | $199/mo 100K units included, same unit rates |
| Teams add-on | $300/mo |
| Enterprise | $2,499/mo |
Recent news
Sources
- Arize pricing page retrieved 2026-10-19
- Langfuse pricing page retrieved 2026-10-19