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Requirements

Cellm requires Windows 10 or higher, Excel 2010 or higer, and the .NET 9.0 Runtime.
  • Open “Microsoft Store” on your computer and search for “Microsoft 365”
  • Click “Install” and follow the install procedure. Requires a Microsoft 365 subscription.

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Install

Cellm is an add-in to the Excel desktop app. Follow these steps from top to bottom to add Cellm to Excel and run a local AI model.
  1. Go to the Github Release page.
  2. Download Cellm-AddIn64-packed.xll and appsettings.json and put them in the same folder.
  1. In Excel, go to File > Options > Trust Center > Trust Center Settings > Trusted Locations.
  2. Click on Add new location..., then Browse..., and navigate to the folder with Cellm-AddIn64-packed.xll and appsettings.json in it. Click OK.
  1. In Excel, go to File > Options > Add-Ins.
  2. In the Manage drop-down menu, select Excel Add-ins and click Go....
  3. Click Browse... and navigate to the trusted folder with Cellm-AddIn64-packed.xll. Select it and click OK
If you want to use the more powerful hosted models right away, you can skip this step. The Hosted Models section shows you how.
To get started, we recommend you try out the Gemma 2 2B model.
  1. Download and install Ollama. Ollama will start after the install and automatically run whenever you start up your computer.
  2. In Excel, select a cell and type out the formulas =PROMPT("Which model are you and who made you?"). The model will tell you that is called “Gemma” and made by Google DeepMind.
Gemma 2 2B is a wonderful little model will run fine on your CPU, ensuring no data ever leaves your computer. And its free. Who knows, perhaps you will also discover the joy of running open source LLMs on your own machine!
Cellm will automatically instruct Ollama to download Gemma 2 2B the first time you call =PROMPT(). The first prompt will therefore take a while.

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Uninstall

  1. In Excel, go to File > Options > Add-Ins.
  2. In the Manage drop-down menu, select COM Add-ins and click Go....
  3. Uncheck Cellm-AddIn64-packed.xll and click OK.
Excel will not load Cellm next time you start it.
In Excel, go to File > Options > Trust Center > Trust Center Settings > Trusted Locations and remove the folder with Cellm-AddIn64-packed.xll in it.
To also remove the unchecked Cellm-AddIn64-packed.xll entry from the Add-Ins list, follow these steps:
  1. Delete Cellm-AddIn64-packed.xll from your disk.
  2. Restart Excel and go File > Options > Add-Ins.
  3. In the Manage drop-down menu, select COM Add-ins and click Go.... Excel will ask you if it should remove the Cellm-AddIn64-packed.xll entry from the list of add-ins.
  4. Click Yes.

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Next steps

Prompting

Learn how to use Cellm to automate repetitive tasks in Excel.

Function Calling

Learn how to use Excel as a low-code task orchestrator by enabling Cellm to access external tools and data.

Local Models

Learn how to run models on your own computer. No data ever leaves your machine. And it’s free.

Hosted Models

Learn how to bring your own API key (BOYK) and use models from Anthropic, OpenAI, and others.
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