Security
Your financial data never leaves your browser
Our Security Promise
As a commercial real estate professional who handles sensitive financial data daily, I built this with security as the top priority. Your data is stored only in your browser's localStorage - we literally cannot access it even if we wanted to.
How Your Data Stays Secure
Browser-Only Storage
All calculations and data storage happen exclusively in your web browser using localStorage. This means your financial information never travels over the internet to our servers.
No Server Database
We don't have user accounts, databases, or any server-side storage for your financial data. No database means no database breaches - it's that simple.
HTTPS Encryption
All pages are served over HTTPS, ensuring your connection to the site is encrypted and secure from man-in-the-middle attacks.
You Control Data Deletion
Delete your data anytime by clearing your browser cache or using the "Clear Data" button in any calculator. Once deleted, it's gone forever - we have no backups because we never had access.
What We DON'T Do
- ✗Store your data on servers
- ✗Require account creation
- ✗Track your financial information
- ✗Share data with third parties
- ✗Store passwords or credentials
What We DO Protect
- ✓Keep all data in your browser only
- ✓Use HTTPS everywhere
- ✓Process payments through Stripe
- ✓Regular security updates
- ✓Transparent privacy practices
Payment Security
All payment processing is handled by Stripe, a PCI-compliant payment processor trusted by millions of businesses. We never see or store your credit card information.
Stripe is certified to PCI Service Provider Level 1, the most stringent level of certification in the payments industry.
Security Best Practices
For Maximum Privacy
Use incognito/private browsing mode. When you close the browser, all data is automatically deleted.
For Shared Computers
Always click "Clear Data" after using the tools, or use private browsing mode.
For Sensitive Documents
Export your PDFs and store them securely on your own device. Delete browser data after exporting.
Regular Maintenance
Periodically clear old data you no longer need. Export important documents first.
Technical Security Details
Infrastructure
- • Hosted on Netlify (static site)
- • No backend servers
- • No databases
- • CDN with DDoS protection
Data Storage
- • Browser localStorage only
- • ~5-10MB limit per origin
- • Domain-isolated storage
- • No cross-site access
Communication
- • TLS 1.3 encryption
- • HTTPS-only access
- • No API calls with your data
- • No third-party data sharing
Compliance
- • GDPR compliant by design
- • CCPA compliant
- • No cookies except analytics
- • Transparent data practices