Compare · llm & agent observability
LangSmith vs PostHog pricing
At 1M traces/month, PostHog is the cheaper list price ($450 vs $4,989).
| LangSmith | PostHog | |
|---|---|---|
| Free tier | Developer: $0, 1 seat, 5K base traces/month, then pay-as-you-go. | 1M analytics events, 5K session recordings, 100K AI-observability events, 1M feature-flag requests per month (resets monthly). |
| Billing unit (LLM & agent observability) | traces | AI events |
| First paid plan | Plus: $39 / seat / mo | Pay-as-you-go: $0 base + usage |
| Pricing data | Published pricing | Published pricing |
| Company status | Active | Active |
| Open source / self-host | No / No | Yes / Yes |
| Last checked | 2026-10-19 | 2026-10-19 |
LLM & agent observability: estimated monthly cost
| traces / month | LangSmith | PostHog |
|---|---|---|
| 100K | $489 Plus (1 seat) | $68.00 Pay-as-you-go |
| 1M | $4,989 Plus (1 seat) | $450 Pay-as-you-go |
| 10M | $49,989 Plus (1 seat) | $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
| LangSmith | |
|---|---|
| Developer | $0 / seat Max 1 seat, 5K base traces/mo |
| Plus | $39 / seat / mo 10K traces included, then 0.005 LSU ($0.005) per additional base trace |
| 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. |
Sources
- LangSmith pricing page retrieved 2026-10-19
- PostHog pricing page retrieved 2026-10-19
- PostHog pricing data (page-data JSON) retrieved 2026-10-19