Free
$0/mo
Run your first real experiment and see the difference proof makes.
- 50k events/mo
- 1 seat
- Latency, cost & business metrics
- 7-day raw-event retention
- All 3 SDKs (Python, TypeScript, Java)
- Traffic-split safety check
- Unlimited experiments
Start free — no credit card required
Every plan runs real experiments with the same trustworthy results. Paid plans add automatic quality grading (LLM-as-judge), more team seats, more traffic, and longer data retention. Upgrade only when you outgrow Free.
Pro
Most popular$149/mo
+$49 per extra 500k events
For teams shipping LLM features who need automatic quality grading.
- 1M events/mo
- 10 seats
- LLM-as-judge · 50k evaluations/mo
- 30-day raw-event retention
- Everything in Free
- Custom judge metrics
- Email support
Business
$799/mo
+$99 per extra 2M events
For production-scale products and larger teams.
- 10M events/mo
- 50 seats
- LLM-as-judge · 500k evaluations/mo
- 90-day raw-event retention
- Everything in Pro
- Method overrides
- Priority support
Enterprise
Coming soonCustom
Custom limits, security review, SSO, and a dedicated contact.
- Custom allowance
- Custom seats
- Custom judge budget
- Configurable retention
- Custom limits
- Security review
- Dedicated support
What the limits mean, in plain words
- Events
- One event = one thing you track (a model call, an exposure, or a business event like a conversion). Assigning a user to a variant is free and unlimited — it never counts.
- Seats
- How many teammates can join your organization and work on the same experiments. Free is single-player (1 seat); Pro gives your team 10 and Business 50.
- LLM-as-judge
- Automatic quality grading: an LLM reads a sample of your outputs and scores them for quality, safety, and relevance — or against your own rubric. Judge grading runs real model calls, so it is included from Pro up with a generous monthly allowance. On Free you still measure latency, cost, and business outcomes.
- Retention
- How long we keep your raw event data. Your results are never deleted — finished results are saved permanently. Retention only limits how far back raw events can be re-analyzed.
- Permutations & samples per arm
- Ceilings on how much statistical compute each experiment can use. Defaults work for almost everyone; higher tiers let very large experiments run at higher precision.
Compare plans
| Limit | Free | Pro | Business | Enterprise(coming soon) |
|---|---|---|---|---|
| Events | 50k events/mo | 1M events/mo | 10M events/mo | Custom allowance |
| Seats | 1 seat | 10 seats | 50 seats | Custom seats |
| Quality grading | Latency, cost & business metrics | LLM-as-judge · 50k evaluations/mo | LLM-as-judge · 500k evaluations/mo | Custom judge budget |
| Retention | 7-day raw-event retention | 30-day raw-event retention | 90-day raw-event retention | Configurable retention |
| Permutations | 1,000 permutations | 2,000 permutations | 10,000 permutations | Configurable permutations |
| Samples per arm | 10k samples/arm | 50k samples/arm | 200k samples/arm | Configurable samples/arm |
Overage: Pro +$49 per extra 500k events; Business +$99 per extra 2M events. Finalized results are snapshotted, so they outlive raw-event retention. An experiment is always analyzed over its own full duration — no tier ever cuts an experiment short.
Enterprise
The Enterprise plan — custom limits, SSO, a security review, and a dedicated contact — is not available yet, and we want to build it around what you actually need. Tell us about your requirements and we will contact you as soon as it opens (and you will help shape it).