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Quick Install

You can quickly try out Cellm in a single Excel session:
  1. Go to the Github Release page and download Cellm-AddIn64-packed.xll and appsettings.json. Put them in the same folder.
  2. Double-click on Cellm-AddIn64-packed.xll and click on “Enable this add-in for this session only” when Excel opens.
  3. Download and install Ollama. The first time Cellm will automatically instruct Ollama to download Gemma 2 2B the first time you call =PROMPT().
See the Install page for instructions on how install Cellm as proper Cellm extension.
Cellm requires Windows 10 or higher, Excel 2010 or higher (desktop app), and .NET 9.0 Runtime.

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Usage

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Sending a prompt to a model

Select a cell and type e.g. =PROMPT("What model are you and who made you?"). The default model will tell you that is called “Gemma” and made by Google DeepMind.

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Processing text in cells

You can use cell references to dynamically change your prompts based on other data in your spreadsheet. For example, try to copy a news article into cell A1 and type in the formula of cell B1 =PROMPT(A1, "Extract all person names mentioned in the text").

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Function Calling

You can use the built-in tools to analyse files on your disk. Fill out a folder path in cell A1 and type in cell A2 =PROMPT(A1, "Which pdf files do I have in my downloads folder?"). Gemma 2 2B does not support tool calling, so for this task you must use another model, e.g. OpenAI’s gpt-4o-mini.

Prompting

Use AI in Excel to automate repetitive tasks.

Function Calling

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

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Configuration

Use the Cellm tab in Excel’s ribbon menu to configure which AI model to use.

Cellm Ribbon

  • Model: Select which AI model to use (e.g., “openai/gpt-4o-mini”). The dropdown gives a couple of preset options. You can also type the model name directly in the drop-down text field to select another model.
  • Address: The API endpoint for your chosen provider (e.g., “https://api.openai.com/v1”)
  • API Key: Your authentication key for the selected provider
The other options in the Cellm tab are:
  • Cache: Enable/disable local caching of model responses to a fixed input. Useful when Excel triggers recalculation of many cells.
  • Functions: Enable/disable function calling.