# Apptainer

**Canonical:** https://apis.io/providers/apptainer/  
**APIs profiled:** 2

Apptainer, formerly Singularity, is a Linux Foundation project providing a high-performance container runtime optimized for high-performance computing and scientific workloads. It enables reproducible, portable scientific computing with support for existing Docker/OCI containers and integration with HPC schedulers.

## Kin Score — 36.2 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 36.2).

| Facet | Score |
|---|---|
| Discoverability | 59.3 |
| Contract Quality | 69.9 |
| Governance | 9.8 |
| Contract Governance | 9.8 |
| Operational Transparency | 39.5 |
| Developer Ergonomics | 16.7 |
| Commercial Clarity | 15.8 |
| Access Clarity | 15.8 |

## Agent readiness — 35.0 (agent-ready)

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

## Access

Freemium · Self-serve signup — onboarding: self-serve, pricing: freemium, trial: no (confidence: high).

## APIs (2)

- **Apptainer Images API** — Container image management
- **Apptainer Instances API** — Running container instance management

## Agentic access (1)

- **Apptainer Agentic Access** — 5 operations · 2 acting

## Security (2)

- **Apptainer Authentication** — http · 1 scheme
- **Apptainer Domain Security** — TLSv1.3 · HSTS · DMARC

## Plans (1)

- **Apptainer Plans Pricing**

## Tags

Containers, HPC, Scientific Computing, Open-Source, Linux Foundation

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