---
summary: 'The ScaiLabs model registry: versioned model storage, variants, access control,
  and P2P distribution.'
title: ScaiAtlas
path: index
status: published
---

# ScaiAtlas

ScaiAtlas is the ScaiLabs **model registry** — a versioned store for machine-learning
models with format variants, namespace-based access control, and peer-to-peer
distribution across clusters.

Think of it as the source of truth for "which model, which version, which format,
who can pull it, and where the bytes live."

## What it gives you

- **Versioned model storage** — semantic-versioned releases (`1.4.0`, `2.0.0-rc1`) per model, each an immutable set of files with SHA-256 checksums.
- **Format variants** — a single version can carry multiple representations (e.g. a `safetensors` original plus `gguf` quantizations) without duplicating metadata.
- **Namespace access control** — every model lives in a namespace with `public` / `tenant` / `private` visibility and per-member roles (owner, admin, member, viewer), backed by ScaiKey identity.
- **Resumable transfer** — chunked, checksum-verified uploads and range-resumable downloads, proxied through the API so clients never need direct storage credentials.
- **P2P distribution** — versions can publish a chunk manifest so peers in a cluster seed to each other instead of hammering origin storage.

## Three ways to use it

| Surface | Best for | Start here |
|---|---|---|
| **Python SDK** (`scaiatlas`) | Applications, pipelines, notebooks | [Quickstart](/docs/scaiatlas/quickstart) → [Python SDK reference](/docs/scaiatlas/reference/python-sdk) |
| **REST API** | Any language, scripting, debugging | [REST API reference](/docs/scaiatlas/reference/rest-api) |
| **CLI** (`scaiatlas`) | Shell workflows, CI | [Quickstart](/docs/scaiatlas/quickstart) |

## The mental model in one picture

```
namespace  →  model  →  version  →  variant  →  files
 (poolnoodle)  (noodletron)  (1.0.0)   (gguf-q4_k_m)  (*.gguf, config.json, …)
```

A **namespace** owns **models**; a model has **versions**; a version has one or
more **variants** (the upload itself is the primary variant); each variant is a
set of **files** with checksums. Read [Resource model](/docs/scaiatlas/concepts/resource-model)
for the full picture.

## Next steps

- **New here?** Follow the [Quickstart](/docs/scaiatlas/quickstart) — from install to your first download in a few minutes.
- **Building an app?** Read the [Python SDK reference](/docs/scaiatlas/reference/python-sdk).
- **Wiring another language?** Read the [REST API reference](/docs/scaiatlas/reference/rest-api).
- **Curious how it fits together?** Read [Architecture](/docs/scaiatlas/concepts/architecture).