Support

For help, email mani.doraisamy@gmail.com. Include the approximate time of the problem, the screen where it occurred, and the exact error text. Do not email spreadsheet rows, access tokens, passwords, or other sensitive data.

Install and open the add-on

1. Install Prereasoner from Google Workspace Marketplace.
2. Open the spreadsheet you want to analyze and reload the browser tab.
3. Choose Extensions → Prereasoner → Ask a question.
4. Review the requested permissions and authorize the add-on.

Prereasoner

Open the Excel workbook you want to analyze, then choose Home → Ask a question from the Prereasoner ribbon group. If the commands are under the ribbon's overflow menu, open More options and select Ask a question. Sign in to your Prereasoner account, enter a question, and review the answer and calculation steps in the task pane. Use Previous conversations to reopen a saved analysis. The add-in reads the workbook when you ask and does not edit cells. It supports up to eight visible worksheets, 50,000 data rows, 256 columns, 8 MB of text per sheet, and 20 MB total.

Excel uses a secure Microsoft sign-in window for your Prereasoner account. If Microsoft sign-in is unavailable or fails, contact support. Do not email workbook data, access tokens, passwords, or other sensitive data.

Permissions

The add-on requests access only to the current spreadsheet, permission to display its interface, permission to contact the Prereasoner service, and basic Google identity scopes used to associate conversations with your account. It does not edit the spreadsheet.

Multiple Google accounts

If Google reports a storage or permission error while opening the sidebar, use a browser profile or private window containing only the Google account that owns or can access the spreadsheet. Open the spreadsheet there, then authorize Prereasoner again. This avoids an Apps Script account-selection conflict.

Spreadsheet limits

The add-on reads up to eight visible, non-empty sheets, 50,000 data rows and 8 MB of text per sheet, 1,000,000 cells and 20 MB of text in all. It automatically uses all visible sheets when they fit, or selects and labels the active sheet when workbook limits require it; there is no scope selector to configure before asking a question. Duplicate and blank headers are kept with column-letter names. Layout warnings do not require you to repair the workbook before asking a question. Formula errors retain their markers; a question that needs an ambiguous field or an unavailable value may need a specific clarification. Hidden and empty sheets are ignored.

Previous conversations

Choose Extensions → Prereasoner → Previous conversations. Select a conversation to open it directly on chat.prereasoner.com. The list comes from your server-side Prereasoner account; the add-on does not keep a separate local conversation index.

Remove access or delete data

You can uninstall the add-on through Google Workspace Marketplace and revoke its Google account access from your Google Account security settings. Delete individual conversations in Prereasoner. For complete account-linked deletion, email the support address above. See the Privacy Policy for retention details.

Security reports

Report a security issue privately by email. You can also review the project's security policy.