Privacy Policy

UnitSwap mobile app

Effective date: October 19, 2026

The short version

Every conversion runs entirely on your device. Nothing you type, convert, export, or save is ever uploaded to us — we don't even have a server to receive it.
No account is required and there is no sign-in of any kind.
Your history (last 10 conversions), favorite pairs, custom units, and preferences are stored only on your device and are deleted when you remove the app.
The only network communication is with Apple's own In-App Purchase system when you buy or restore the Premium Pack.
We run no ads, no analytics, no tracking SDKs, and we never sell your information — there is nothing to sell.

1. Scope of this Policy

This Privacy Policy describes how UnitSwap ("the App", "we", "us") handles personal information when you use the UnitSwap iOS app. It applies to all features of the App, including everyday and industry unit conversion, amount-to-Chinese-uppercase conversion, batch conversion, custom units, export, and in-app purchases.

2. Information We Collect

We do not collect any personal information. The App has no accounts, no sign-in, no server backend, and no analytics. Specifically:

No identity data. We never ask for or receive your name, email address, phone number, or Apple ID.
No content data. The numbers you convert, the amounts you enter, and the files you export never leave your device. Exported files are created on your device and shared only through the iOS share sheet with destinations you choose.
No behavioral data. We do not record what you search, convert, or tap, and we do not use any analytics or crash-reporting SDKs.
No advertising identifiers. The App contains no ad SDKs and does not access advertising or cross-app tracking identifiers.

3. How We Use Information

Because the App collects nothing, there is nothing for us to use. All calculations — unit conversions, amount-to-uppercase conversion, batch processing — are performed locally on your device by the App itself.

4. Data Stored on Your Device

The following data is created by the App and stored only in your device's local storage. It never leaves your device, is not backed up to any cloud service by us, and cannot be read by us:

Data	What it is	Your control
Conversion history	The last 10 conversions	Clear at any time in History → Clear, or in Settings
Favorite pairs	Unit pairs you starred (e.g. jin ↔ pound)	Remove by tapping the star again
Custom units	Conversion formulas you created	Delete by swiping in Custom Units
Preferences	Language and appearance (light/dark)	Change at any time in Settings

Uninstalling the App removes all of the above immediately and permanently.

5. In-App Purchases and Apple

The Premium Pack is a one-time purchase processed entirely by Apple through Apple's In-App Purchase system.
Payment information, your Apple ID, and the transaction itself are handled by Apple under Apple's Privacy Policy. We never see your card number, Apple ID, or any payment credentials.
The App queries Apple's on-device StoreKit entitlements to know whether the Premium Pack is unlocked on this device. This check happens between the App and Apple; we receive no data about it.
Purchases and refunds are managed by Apple. To request a refund, use reportaproblem.apple.com.

6. Data Retention Summary

Data	Retention
Anything you type or convert	On your device only; never uploaded, never sent to us
History / favorites / custom units / preferences	On your device only; deleted with the App or by you at any time
Exported files (text / CSV)	Created on your device; whatever you do with them is up to you
Data on our servers	None — the App operates without any server of ours

We do not display ads, do not embed advertising, analytics, or cross-app tracking SDKs, and do not share, sell, or rent any information to third parties. The only third party involved in the App's operation is Apple, solely for In-App Purchases as described in Section 5.

8. Children

The App is not directed to children under 13, and we do not knowingly collect personal information from children — from anyone, in fact. UnitSwap is a calculator: it contains no user-generated content, no community features, and no data collection.

9. Your Rights and Choices

Privacy laws in many regions (for example the EEA, UK, and California) grant rights of access, correction, deletion, and objection. Since the App collects no personal information and keeps everything on your device, you already have complete control:

Delete everything: uninstall the App — this immediately erases all history, favorites, custom units, and preferences.
Delete partially: clear history in the History tab or Settings; remove favorites or custom units one by one.
Verify: the App works fully in Airplane Mode — a simple proof that no data is transmitted.
Questions: email us at 2894599828@qq.com and we will respond within a reasonable period.

10. Changes to this Policy

We may update this Policy to reflect changes in the App or the law. The "Effective date" at the top shows the latest revision; updates will be published within the App and on this page. If a future version of the App ever changes these practices, this Policy will be updated before that version is released.

11. Contact Us

If you have questions about this Policy or your data:

Email: 2894599828@qq.com

UnitSwap is developed by Mingjun Li.