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Privacy Policy

Last updated: April 2026

Waterside Technology LTD (“we”, “us”, or “our”) operates the Deal Analyser at prop-ai.tech/deal-analyser. This Privacy Policy explains how we collect, use, and protect your personal data when you use the tool.

1. Information We Collect

Account Data

When you create an account or log in, we collect:

  • Email address (used for magic link authentication)
  • Name (if provided during signup)
  • Subscription and billing information (processed by Stripe)

Property Analysis Data

When you use the calculator, you may enter:

  • Property details (address, price, type, condition)
  • Financial inputs (purchase price, renovation costs, rental income)
  • Investment strategy preferences

This data is stored locally in your browser (localStorage) and synced to our cloud infrastructure (AWS DynamoDB) so you can access it across devices.

Automatically Collected Data

  • Anonymous website usage analytics (via Google Analytics GA4)
  • Cookie consent preferences (via CookieYes)

2. How We Use Your Data

  • Authenticate your account and manage sessions
  • Store and sync your property analysis data across devices
  • Process AI-powered deal analysis (via OpenAI)
  • Process subscription payments (via Stripe)
  • Send transactional emails — magic link login and notifications (via Resend)
  • Send marketing communications (with your consent)
  • Improve the calculator and fix issues

3. Legal Basis for Processing

We process your personal data based on:

  • Contract: To provide the calculator service you signed up for
  • Consent: For marketing communications and optional analytics
  • Legitimate interests: To maintain security and improve the service
  • Legal obligation: To comply with financial record-keeping requirements

4. AI Data Processing

When you use AI-powered features (refurb estimation, GDV estimation, deal structure analysis, deal verdict), relevant property data from your current analysis is sent to OpenAI for processing. This includes property details, financial inputs, and questionnaire answers.

We do not send your email address or account details to OpenAI. The AI provider's own data processing terms also apply. OpenAI does not use API data to train its models.

5. Third-Party Processors

We use the following third-party services. All are bound by data processing agreements in accordance with UK GDPR:

  • Amazon Web Services (AWS) — cloud hosting, data storage, and authentication (EU-West-2, London region)
  • Stripe — subscription billing and payment processing (PCI Level 1 certified)
  • OpenAI — AI-powered deal analysis features
  • Resend — transactional email delivery (magic link authentication, notifications)
  • Google Analytics (GA4) — anonymous website usage analytics
  • CookieYes — cookie consent management

6. Data Retention

  • Account data: Retained for the duration of your account. Deleted within 30 days of account closure.
  • Property analysis data: Retained while your account is active. You can delete individual properties at any time.
  • Financial/billing data: Retained for 7 years to comply with HMRC requirements.
  • Analytics data: Anonymised and retained for 26 months.
  • Marketing consent records: Retained while consent is valid, plus 1 year after withdrawal.

7. Data Security

We implement appropriate technical and organisational measures to protect your data, including encrypted data transfer (TLS), encrypted storage, JWT-based authentication with auto-expiry, and access controls on all cloud resources.

8. Your Rights

Under UK GDPR, you have the right to:

  • Access your personal data
  • Correct inaccurate data
  • Request deletion of your data
  • Object to processing of your data
  • Request restriction of processing
  • Data portability
  • Withdraw consent at any time
  • Lodge a complaintwith the Information Commissioner's Office (ICO)

You can contact the ICO at ico.org.uk, telephone 0303 123 1113, or write to Wycliffe House, Water Lane, Wilmslow, Cheshire, SK9 5AF.

9. Cookies

The calculator uses essential cookies for authentication and theme preferences. Analytics cookies are only set with your consent via the cookie banner. You can manage your preferences at any time.

10. Contact Us

If you have questions about this Privacy Policy, contact us:

Waterside Technology LTD
Company No. 17141235

Email: hello@prop-ai.tech

ICO registration number: [pending]

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