# Why Null Review if OCR exists?

Choose by the workflow your team needs to operate.

## OCR is a capable review tool

Alibaba Open Code Review provides CLI/agent workflows, rule matching, file search and model-provider integration. If your team needs that workflow and can maintain the surrounding system, evaluate OCR directly.

## Null organizes the surrounding workflow

### Shared context

A pinned ContextPack instead of reconstructing the request.

### Tenant ownership

Roles, service databases and repository scopes.

### Decision history

Review, recheck, CI and controlled actions in one trail.

The intended benefit is less integration work for teams that need these controls. This is a product-scope comparison, not evidence that OCR cannot be extended or that Null has better model quality. Validate the benefit in a pilot.

## Sources and validation

[Alibaba Open Code Review: README and source](https://github.com/alibaba/open-code-review) · [Open Code Review](https://open-codereview.ai)

[Inspect the Null architecture](/docs/architecture)