Your data never leaves your computer
Audit, redact, and extract — powered by local AI. No cloud, no compromises.
Three tools, one app, zero cloud
A local AI toolbox that audits, redacts, and extracts — without uploading a single byte.
Spreadsheet Audit
23 built-in rules plus a fine-tuned AI model catch formula errors — broken references, inconsistent ranges, hidden circular dependencies, and more.
| A | B | C | D | E | |
|---|---|---|---|---|---|
| 1 | Q1 | Q2 | Q3 | Q4 | |
| 2 | Revenue | $12,450 | $15,200 | $11,800 | $18,300 |
| 3 | COGS | $4,100 | $5,050 | $3,900 | $6,200 |
| 4 | Gross Profit | $8,350 | $10,150 | $7,900 | $12,100 |
| 5 | Expenses | $4,200 | $4,100 | #REF! | $5,900 |
| 6 | Net Income | $4,150 | $6,050 | =C3/0 | $6,200 |
| 7 | Tax Rate | 21% | 21% | 21% | 21% |
| 8 | After Tax | $3,278 | $4,780 | $0 | $4,898 |
Sensitive Data Protection
Detect and redact personal data in your documents — names, phone numbers, ID numbers, emails. Supports 8 languages with 12 pattern types.
| A | B | C | D | E | |
|---|---|---|---|---|---|
| 1 | Name | Department | Phone | ||
| 2 | 1 | John Smith | Finance | +1 (555) 123-4567 | john@acme.com |
| 3 | 2 | Maria Garcia | Engineering | +1 (555) 234-5678 | maria@acme.com |
| 4 | 3 | David Chen | Marketing | +1 (555) 345-6789 | david@acme.com |
| 5 | 4 | Sarah Johnson | Legal | +1 (555) 456-7890 | sarah@acme.com |
| 6 | 5 | Robert Lee | Operations | +1 (555) 567-8901 | robert@acme.com |
Data Extraction
Pull structured data from invoices, receipts, and reports. Identify document types, extract key fields, and export to JSON or CSV.
| A | B | C | D | E | |
|---|---|---|---|---|---|
| 1 | Description | Qty | Unit Price | Amount | |
| 2 | 1 | Consulting Services | 40 | $150.00 | $6,000.00 |
| 3 | 2 | Software License | 5 | $890.00 | $4,450.00 |
| 4 | 3 | Support Plan | 1 | $2,000.00 | $2,000.00 |
| 5 | Subtotal | $12,450.00 | |||
| 6 | Tax (8%) | $996.00 | |||
| 7 | Total | $13,446.00 |
Why local matters for your data
Most AI tools upload your sensitive data to remote servers. CellSentry never does.
| Cloud AI Tools | CellSentry | |
|---|---|---|
| Your Data | Uploaded to third-party servers | Never leaves your computer |
| Internet | Required for every analysis | Works completely offline |
| Privacy | Policies can change anytime | Zero data collection, ever |
| Cost | Monthly subscription fees | Free forever — MIT license |
| Speed | Network round-trip latency | Instant local AI processing |
| Control | Vendor lock-in, proprietary | Open source, fork anytime |
How it works
Open the app, drop a file, and get results in seconds.
Open CellSentry
Launch the desktop app on Mac or Windows. No account, no sign-in required.
Drop your spreadsheet
Drag and drop any .xlsx or .xls file. CellSentry reads it locally — nothing is uploaded.
Choose your analysis
Pick a scan mode: formula audit, sensitive data protection, or data extraction. Each runs the rule engine plus AI.
Review & export
Browse results by severity, click to navigate to problem cells, and export HTML reports or marked Excel files.
Frequently asked questions
Ready to protect your data?
Download CellSentry and start auditing formulas, protecting sensitive data, and extracting data — all locally. No account required.