CellSentry Privacy Policy
Last updated: November 9, 2026
CellSentry is made by OriginTone (“we”). This policy explains how CellSentry handles your information.
Our core principle
CellSentry is designed for local spreadsheet analysis. Workbook content is processed locally for formula audit, workbook-sensitive-data review and optional local AI inference. Model downloads, update checks and website traffic metrics are separate network activities.
CellSentry Excel Add-in
The CellSentry Excel Add-in runs entirely within your browser as an Office Web Add-in. It does not send any data to external servers. All formula analysis is performed locally in your browser session.
What data the add-in accesses
The CellSentry Excel Add-in accesses the following data from your workbook, solely for the purpose of formula error analysis:
- Cell values and formulas in the active worksheet
- Cell formatting information (number formats, conditional formatting)
- Worksheet structure (named ranges, merged cells)
This data is processed entirely within your browser and is never transmitted to any external server. When you close the add-in, no data is retained.
CellSentry desktop application
The Mac RC.3 offline preview includes its formula model and prepares it locally in the background. The earlier Windows beta may download a missing model. Workbook content is not sent to a cloud AI service during analysis. The downloadable installers are older three-workflow builds; the audit-only source direction has not yet shipped as a replacement installer.
No application telemetry; aggregate website metrics
The desktop app does not include behavioural telemetry or a cloud analytics SDK. The CellSentry website, cellsentry.pro, is served through Cloudflare, which provides aggregate edge traffic metrics used to understand site traffic. We do not use Google Analytics or Mixpanel.
What we don’t collect
- We do not collect workbook content for cloud processing
- We do not include behavioural telemetry in the desktop app
- We do not send workbook contents to a cloud AI service for analysis
- We do not use Google Analytics or Mixpanel
- We do not send your formulas to any external server
- The AI model runs locally — no cloud API calls are made during analysis
What we do process
- Model setup: The Mac offline preview embeds the model; remote model download is disabled in that preview. The legacy Windows beta may use Hugging Face, hf-mirror or ModelScope. Download providers process network metadata such as the requesting IP.
- Update checks: The desktop app may check GitHub Releases for version updates. This policy does not claim that no network metadata is processed by GitHub or the network used for that check.
- Website traffic: Cloudflare provides aggregate edge traffic metrics for the CellSentry website. These metrics are separate from workbook analysis and do not create an in-app usage profile.
Local data storage
CellSentry stores the following data locally on your machine:
- Application settings and preferences
- Usage statistics (scan counts, stored locally only)
- AI model files
Settings and models reside in the local application data directory. Uninstalling the app may leave these files behind; preserve any needed data before removing them.
Transparency
The published source code is available under the MIT License. You can inspect the repository to understand the local analysis path, model download path, and release update behaviour. Treat beta results as assistance and independently verify material spreadsheet, privacy, financial, or compliance decisions.
Contact
Email [email protected] with any question about this policy.