Privacy Policy

Last updated: July 2026

Door Knocker ("the App") identifies UK property listings from a photo of an estate agent sign and your location. This policy explains what the App processes and what happens to it.

What the App Sends When You Scan

When you scan a sign, the App sends the following to our server so it can identify the property:

• The photo you take of the estate agent sign (which may incidentally include its surroundings).
• Your precise location and compass heading at the moment of the scan.
• If you pick a photo from your files instead, the location embedded in that photo is used.

This information is used solely to answer that one scan. It is processed in memory on our server (hosted in London, United Kingdom on AWS) and is not stored after your request completes.

AI Image Analysis

The photo is analysed by a third-party AI vision service to read the estate agent's name and the sign's status (for sale, to let, sold). The photo is sent for analysis only and is not used by us to build any profile of you.

Property Data Sources

Listing and property information shown in the App comes from publicly available sources, including Rightmove listing pages, HM Land Registry Price Paid Data (© Crown copyright and database right), the Energy Performance Certificate register, and postcode data. Maps are provided by Apple Maps (iOS) and Google Maps (Android), which operate under their own privacy policies.

Data Stored on Your Device

• Saved houses: properties you favourite are stored locally on your device only and are never transmitted to us.

Accuracy Feedback

If you answer the optional "Right house?" prompt, we record the listing reference, its address and your yes/no answer in our service logs to improve matching accuracy. This feedback contains no information that identifies you.

What We Don't Do

• No accounts — the App never asks who you are.
• No analytics, tracking or advertising services.
• No selling or sharing of your data with third parties beyond the processing described above.

Children's Privacy

The App is not directed at children and does not knowingly collect personal information from anyone, including children under 13.

Changes to This Policy

If this policy changes, the updated version will be published at this address with a revised date.

Contact

Questions about this policy or your data: mark.hayward@cloudavian.com