Frequently Asked Questions

Your deal data is stored locally on your device and backed up to encrypted cloud storage on AWS in the UK. Data syncs automatically when you're signed in so you can pick up where you left off on any device.

Yes. All data is encrypted in transit with TLS 1.2+ and at rest with AES-256. The application is built following OWASP Top 10 security guidelines and is fully UK GDPR compliant. Your data is never shared with or sold to third parties.

All payments are processed securely through Stripe, which is PCI Level 1 certified — the highest level of payment security. We never see or store your card details. You can manage your subscription directly from the Settings page inside the app.

You get a full 5-day free trial with all Advanced features, and can analyse a single property. We take your card when you sign up but don't charge it during the trial — when the 5 days are up, your Advanced subscription starts automatically, unless you cancel before then from within the app. Either way your data is preserved, so you can pick up exactly where you left off.

AI analysis is only triggered when you explicitly request it (e.g. refurb estimates, deal verdicts). Only the deal data relevant to that analysis is sent to OpenAI's API. Your data is not used to train AI models.

The calculator supports four UK property investment strategies: Fix & Flip (buy, renovate, sell), Buy-to-Let (single tenancy rental), BRRR (Buy, Refurb, Rent, Refinance), and HMO (House in Multiple Occupation — rent by the room). Each strategy has its own KPIs, cost breakdowns, and sensitivity analysis, and we're continuing to expand the toolkit — more strategies are planned for the future.

When you request AI analysis, the calculator sends your deal data to OpenAI's GPT models to generate refurb cost estimates, GDV assessments, deal structure plans, and an overall verdict. Each AI module draws on the context from the other steps of your own deal for more accurate results. You control when AI is used — nothing is sent automatically.

ChatGPT or Claude will happily give you property numbers, but a general AI tool is only as good as the prompt you give it — put the wrong figures in, or miss a detail, and it will confidently give you the wrong answer back. The PropAI Deal Analyser is purpose-built. The core sums — stamp duty, yields, cash flow, stress tests — run on our own tested code, not an AI guess. We bring in AI only where it genuinely helps, like refurb estimates and the deal verdict, and even then we control what data it sees and check its answers against your real figures. Everything is validated and verified.