Simple Unit Converter
Privacy Policy
Last updated: 21 August 2026
This policy covers Simple Unit Converter for iPhone. It explains what the app does with your data, which is close to nothing — and it is specific about the few places where anything at all leaves your phone. It is written to comply with UK data protection law, including the UK GDPR and the Data Protection Act 2018.
The short version
- We collect nothing. No accounts, no sign-up, no analytics, no advertising, no tracking, no crash reporting. We have no server, so there is nowhere for your data to go.
- Your conversions, history and favourites are stored on your iPhone, and we never see them.
- The app makes one kind of network request: downloading published exchange rates, at most once a day. It is the same request for every user and says nothing about you.
- The app asks for no permissions at all — no location, no contacts, no camera, no notifications.
- We never sell personal data, because we never have any.
Who we are
Simple Unit Converter is made by Sassy Pants, an independent app studio, and published on the Apple App Store. For anything in this policy, contact [email protected].
What we collect about you
Nothing. There is no account to create, no profile, no identifier assigned to you, and no telemetry of any kind. We operate no server and run no analytics, so we never receive your conversions, your usage patterns, your device details or your IP address — not in anonymised form, not in aggregate, not at all.
What the app stores on your iPhone
So the app is useful between launches, it saves three things locally, in its own sandboxed storage:
- Conversion history — your most recent 20 conversions. Each entry records the units, the numbers you typed and got back, and when you did it.
- Favourites — up to 8 conversions you have pinned, stored as the unit pair and when you pinned it.
- Cached exchange rates — the last rates downloaded, so currency conversion keeps working offline.
We never receive any of it. No part of it is used in any network request, and no third party can read it. It is removed completely when you delete the app. You can also clear your conversion history from within the app at any time.
Two honest caveats, because "it never leaves your phone" deserves to be exact:
- Your own device backups. If you use iCloud Backup or an encrypted computer backup, this storage is included in your backup, like most apps' data. That backup is between you and Apple, under your Apple Account — the app performs no syncing of its own, and we have no access to it.
- Copying a result. When you tap to copy a conversion result, it goes to the iOS clipboard. Anything on the clipboard can be pasted into other apps by you, and if you have Handoff switched on, iOS may relay it to your own other Apple devices via Universal Clipboard. That is a normal iOS copy, done at your request, and it involves us not at all.
Currency rates: the one network request
Currency conversion needs real exchange rates, so the app downloads them. This is the only network request the app makes — there is no other server contact anywhere in it.
- Where from: the free, open-source Frankfurter exchange-rate API, at
api.frankfurter.dev, which republishes reference rates from central banks. - What is sent: a fixed request for the published rate table, always based on sterling (
base=GBP). It is hardcoded — byte-for-byte the same request from every copy of the app, every time. It does not contain the currency you picked, the amount you typed, your result, your history, an API key, an account, a device identifier or an advertising identifier. Nothing you do in the app changes it. - When: the app checks for fresh rates when it starts and when you return to it, but actually goes to the network at most once every 24 hours. It does this whether or not you use the currency converter that day, so rates are ready when you need them, and there is currently no setting to switch it off. If the request fails, the app silently carries on with the rates it already has.
- What your device unavoidably reveals: as with any request any app makes to any server, the service can see the IP address it came from, roughly when, and the standard headers iOS attaches (such as the app and iOS version). Your IP address counts as personal data under UK GDPR, so we would rather name it than claim the request is magically invisible. We do not receive it, and it is not used to identify you.
- Frankfurter's own position: they state the API itself does not collect personal data, but that the public service sits behind Cloudflare, which collects basic information for analytics and abuse prevention. That processing is Frankfurter's and Cloudflare's — we receive none of it and have no relationship with it.
- Offline: every unit conversion works with no network at all, and currency conversion falls back to the cached rates. The app shows a "rates as of" date so you always know how fresh the figures are.
Paying for the app
Simple Unit Converter is bought once, up front. There are no in-app purchases and no subscriptions. The purchase is handled entirely by Apple: we never see, receive or store your payment card, billing address or Apple Account details. Apple's handling is governed by Apple's privacy policy, and refunds go through Apple at reportaproblem.apple.com.
No tracking, no ads, no analytics
The app contains no advertising, no third-party analytics or attribution SDKs, and no crash-reporting service. In fact it contains no third-party code at all. It does not use the App Tracking Transparency prompt, because it has nothing to ask you for: it does not track you across apps or websites and never touches your device's advertising identifier. It will not interrupt you with rating prompts or consent walls while you are converting.
Separately, Apple gives every developer anonymous, aggregated App Store statistics — downloads, rough territory, crash counts — where users have opted in to sharing with developers. We cannot identify anyone from those figures or connect them to your use of the app. We also see App Store ratings and reviews, which carry whatever name you chose to publish them under; that is Apple's channel and entirely your choice to use.
Permissions
The app requests no runtime permissions whatsoever. It has no access to your location, contacts, photos, camera, microphone, calendar, health data or notifications, and it asks for none. If your iPhone ever prompts you to grant Simple Unit Converter one of these, something is wrong — please email us.
If you email us for support
When you email us, we receive your email address and whatever you put in the message. We use it only to reply and to fix the problem, relying on our legitimate interests (Article 6(1)(f) UK GDPR) in supporting our apps. Support emails are kept for up to 24 months and then deleted. Your address is never added to a marketing list and never shared.
Children
The app is not aimed at children specifically, but it is safe for any age in the way that matters here: it collects no data from anyone, contains no advertising, has no chat or user-generated content, and links nowhere unexpected.
Your rights
Under UK GDPR you have the right to access, correct, erase, port, restrict or object to the processing of your personal data, and to withdraw consent where consent is what we rely on.
For the app itself there is honestly nothing to exercise these rights against: we hold no personal data about you, so there is nothing for us to hand over, correct or delete. The data the app creates sits on your phone under your control, and deleting the app erases it. Where these rights do apply is any support email you have sent us — write to [email protected] and we will act within one month.
Complaints
If you are unhappy with how we have handled your data, please tell us first and we will try to put it right. You can also complain to the Information Commissioner's Office (ICO) at ico.org.uk.
International transfers
We hold no personal data, so we transfer none. The exchange-rate request is served from a global content delivery network and carries no personal data beyond the IP address inherent in any internet connection.
App Store privacy label
Our App Store listing declares Data Not Collected, consistent with everything described on this page: we receive no data from the app, and the single rates request is a fixed, anonymous call to a public API.
Changes to this policy
If the app's data behaviour ever changes — a new data source, a sync feature, anything at all — we will update this page and the date at the top before that version ships, and say so in the release notes.
Contact
Need help with the app? See Simple Unit Converter support. Looking for our studio-wide policy, covering this website and our other apps? See the main privacy policy.