# AtomicJar

**Canonical:** https://apis.io/providers/atomicjar/  
**Website:** https://www.atomicjar.com/  
**APIs profiled:** 0

AtomicJar is a developer-testing company, founded in 2021 by the original creators and maintainers of the open-source Testcontainers project and acquired by Docker in December 2023. AtomicJar builds tooling that lets developers run reliable integration tests against real service dependencies (databases, message brokers, and other systems) defined in code and wrapped in Docker containers, replacing brittle mocks and in-memory fakes. Its product line spans Testcontainers OSS (the open-source libraries for Java, .NET, Go, Node.js, Python, Rust, and more), Testcontainers Desktop (a companion app for local development), and Testcontainers Cloud (a hosted service that offloads container execution to the cloud so tests run consistently from a laptop through CI without a local Docker daemon). AtomicJar and its Testcontainers products are used by engineering teams at companies including Spotify, Uber, Capital One, Elastic, Netflix, and Zalando.

## Kin Score — 19.5 / 100 (emerging)

Scored 2026-08-17 under rubric 0.11.0. Trend: flat (+0.0 from 19.5).

| Facet | Score |
|---|---|
| Discoverability | 50.0 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Operational Transparency | 5.3 |
| Developer Ergonomics | 34.8 |
| Commercial Clarity | 34.2 |

## Agent readiness — 0.0 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## Security (1)

- **Atomicjar Domain Security** — TLSv1.3 · DMARC

## Tags

Company, Devops, Testing, Integration Testing, Testcontainers, Containers, Developer Tools, Continuous Integration, Open Source

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/atomicjar/). Scores are computed from the provider's own public artifacts under a published rubric.