Privacy Policy
Last updated: 2026-05-31
formulaDB is an Excel add-in that runs entirely inside your browser. Its query engine, DuckDB compiled to WebAssembly, executes within the Office.js sandbox in the same browser context as your workbook. The practical consequence for privacy is unusual and worth stating plainly: your spreadsheet data and the files you query are never sent to a formulaDB server, because there is no formulaDB server in the data path.
Data We Collect
Personal Information
We do not require an account to use formulaDB, and we do not collect names, addresses, or payment details through the add-in. If you email us, we receive whatever you choose to put in that message.
Usage Information
The add-in itself contains no analytics, no telemetry, and no third-party tracking scripts. We do not build a usage profile of you. Our hosting provider may keep standard, short-lived web-server access logs for the static pages of this site (the marketing and documentation pages you are reading now); those logs are not linked to any workbook activity.
Your Excel Data
Your cell values, formulas, and query results stay in your workbook and in
the browser tab running the add-in. Local files you open through the task
pane are handed to a browser-local virtual file system by file handle;
their bytes never leave your machine. Remote sources you reference by
https:// URL are fetched directly from their origin by your browser —
formulaDB does not proxy, mirror, or cache them on any server we operate.
How We Use Your Data
Because the engine runs locally, we have no copy of your data to use. Query inputs and results are used only to compute the answer that spills back into your sheet, on your device. If you contact support, we use your message solely to respond to you.
Data Storage and Security
formulaDB keeps no server-side store of spreadsheet data — there is no retention window because there is nothing retained off your device. The add-in's own code is delivered over HTTPS. Within a session, sources and results are held in browser memory and an in-memory cache, and are cleared when the workbook or tab closes. Securing the device and Microsoft 365 account that load the add-in is, as with any Excel content, in your control.
Third-Party Services
formulaDB integrates no third-party identity provider, no analytics vendor, and no commerce processor. The only parties in the picture are:
- Your hosting of the data you query — when you point at a
remote
https://source, your browser talks to that origin directly, under whatever terms that origin sets. - Our static-site host — this website (landing, docs, and legal pages) is served by a content-delivery network. It sees ordinary requests for static files, not your workbook.
- Your Microsoft 365 environment — Excel and the Office.js runtime load the add-in. Microsoft's handling of your Office session is governed by your agreement with Microsoft.
Your Rights
Since we hold no personal data extracted from your use of the add-in, there is generally nothing for us to export or erase on your behalf. For any email correspondence you have sent us, you may ask us to delete it at [email protected].
International Data Transfers
Your query data does not cross a border through us, because it does not pass through us at all. Where your browser fetches a remote source, the transfer is between you and that source's host. Requests for this static site may be served from a content-delivery edge near you.
Data Breach Notification
A breach of a central store of your spreadsheet data is not a risk we can have, because we keep no such store. Should we ever become aware of a security issue affecting the add-in's code or this site, we will publish the details here and notify anyone who has contacted us, as required by applicable law.
Changes to this Policy
If formulaDB's architecture changes in a way that affects this policy, we will update this page and revise the "last updated" date above. Material changes will be called out clearly.
Contact Us
Questions about privacy? Email [email protected].