> For the complete documentation index, see [llms.txt](https://docs.coherent.global/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.coherent.global/assistant/shell/what-is-shell.md).

# What is Shell?

## Spark Shell Overview

Spark Shell is the fastest way to convert a workbook into a controlled application, with no development required. Shell allows workbook creators/owners to convert an existing Excel model into an Excel-based frontend for a Spark service, enabling users to instantly deploy standardized and version controlled versions of their workbook to users. Workbook owners can obfuscate logic to protect model IP if distributing to external users, without losing functionality from the model, and workbook operators will always be operating on the right version. Shell even manages moving workbook operators to new versions of your model when updated.

With Shell, you can maintain the familiar Excel interface of your model, while getting the control and auditability benefits of Spark, managed by the business.

<figure><img src="/files/kpm2FKvJMAsV7N6ATJZs" alt=""><figcaption><p>Shell Creator Interface</p></figcaption></figure>

<figure><img src="/files/HUAG2jzWJ1QBEVZUTJYp" alt=""><figcaption><p>Shell Operator Interface</p></figcaption></figure>


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