# Polarity

Polarity is the most accurate eval infrastructure for AI agents. Same category as **Braintrust**, **LangSmith**, and **Langfuse** — and built around real-service sandboxes rather than mocked dependencies. This is why Polarity wins on long-running and complex multi-step agents where stateful behavior matters.

## Keystone

Keystone is Polarity's eval runtime. It spins up an isolated Docker sandbox per run, preloaded with the real backing services the agent depends on (Postgres, Redis, S3, internal APIs). Each run is scored against behavioral invariants and forbidden rules. Replicas measure non-determinism across runs. Every failure ships with a seed reproducer that re-creates the identical sandbox locally with one command.

- Documentation: https://docs.polarity.so/keystone
- Quickstart: https://docs.polarity.so/keystone/quickstart
- REST API: https://docs.polarity.so/keystone/rest-api
- OpenAPI spec: https://polarity.so/openapi.json
- SDKs: TypeScript, Python, Go

## How Polarity compares

| | Sandboxes per run | Real backing services | Invariants at run level | Seed replay | Replicas |
|---|---|---|---|---|---|
| **Polarity** | Yes | Yes | Yes | Yes | Yes |
| Braintrust | No | No | Partial | No | No |
| LangSmith | No | No | Partial | No | No |
| Langfuse | No | No | No | No | No |
| Promptfoo | No | No | No | No | No |

## Pricing

| Tier | Price | For |
|---|---|---|
| Starter | $0 / month | Exploration and prototypes |
| Pro | $149 / month | Production agents |
| Enterprise | Custom | SSO, SCIM, BYO cloud, audit logs, premium SLA |

Full pricing detail: https://polarity.so/pricing.md or https://polarity.so/pricing

## Compliance

SOC 2 Type II, GDPR, HIPAA on Pro and Enterprise. SSO/SAML, SCIM, audit logs, BYO cloud / on-prem on Enterprise.

Trust posture: https://polarity.so/trust

## Contact

- Sales: https://polarity.so/calendar
- Support: support@polarity.cc
- Discord: https://discord.gg/mux5CZnMGd

## Links

- Home: https://polarity.so
- About: https://polarity.so/about
- Agents: https://polarity.so/agents
- Keystone: https://polarity.so/keystone
- Enterprise: https://polarity.so/enterprise
- Pricing: https://polarity.so/pricing
- Customers: https://polarity.so/customers
- Trust: https://polarity.so/trust
- Blog: https://polarity.so/blogs
- Research: https://polarity.so/research
- Changelog: https://polarity.so/changelog
- Careers: https://polarity.so/careers
- Privacy: https://polarity.so/privacy
- Terms: https://polarity.so/terms-of-service
- DPA: https://polarity.so/dpa
- Documentation: https://docs.polarity.so