Data and credits
Interest rates: Bank of England
Interest rates in the app (Bank Rate and average quoted mortgage rates) come from the Bank of England Database.
Contains Bank of England data, © the Governor and Company of the Bank of England, licensed under the Open Government Licence v3.0.
The app is not affiliated with, or endorsed by, the Bank of England. "Bank of England" is a registered trade mark of the Bank of England and is used here only to name the source of the data.
Tax rules
Tax bands and rates (Stamp Duty Land Tax, Land and Buildings Transaction Tax, Land Transaction Tax, capital gains tax and the ISA allowance) are based on information published by HM Revenue & Customs, Revenue Scotland and the Welsh Revenue Authority.
Contains public sector information licensed under the Open Government Licence v3.0.
These tables have not yet been checked against the official sources.
Open-source software
The app is built with open-source software. Every package bundled in the app is under a permissive licence that allows this use. The main ones are:
| Package | Version | Licence |
|---|---|---|
| React | 19.3.0 | MIT |
| React Native | 0.88.0 | MIT |
| Expo (including Expo Router, Expo SQLite, Expo Font, Expo Linear Gradient and other Expo modules) | 58 | MIT |
| Expo Vector Icons (including the Ionicons icon font) | 15.1.1 | MIT |
| React Native Safe Area Context | 5.10.1 | MIT |
| React Native Screens | 4.30.0 | MIT |
| React Native SVG | 15.16.0 | MIT |
| Zod | 3.25.76 | MIT |
Expo SQLite includes SQLite, which is in the public domain. The full list of packages, with each licence text, is in Settings → Open-source licences.