Compare · llm & agent observability
Arize vs PostHog pricing
At 1M traces/month: Arize Contact sales, PostHog $450.
| Arize | PostHog | |
|---|---|---|
| Free tier | AX Free: 25K spans/month, 1 GB ingestion, 15-day retention. Phoenix OSS is free to self-host. | 1M analytics events, 5K session recordings, 100K AI-observability events, 1M feature-flag requests per month (resets monthly). |
| Billing unit (LLM & agent observability) | spans | AI events |
| First paid plan | AX Pro: $50/mo | Pay-as-you-go: $0 base + usage |
| Pricing data | Partially published | Published pricing |
| Company status | Acquired | Active |
| 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 | PostHog |
|---|---|---|
| 100K | Contact sales | $68.00 Pay-as-you-go |
| 1M | Contact sales | $450 Pay-as-you-go |
| 10M | Contact sales | $3,930 Pay-as-you-go |
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 |
| PostHog | |
|---|---|
| Free | $0 Usage stops at free-tier limits. |
| Pay-as-you-go | $0 base + usage Per-product graduated rates above the free allowance; billing limits per product. |
Recent news
Sources
- Arize pricing page retrieved 2026-10-19
- PostHog pricing page retrieved 2026-10-19
- PostHog pricing data (page-data JSON) retrieved 2026-10-19