Last update 31 October 2026

Privacy Policy — Koinvert

Koinvert is a converter for currencies, cryptocurrencies and precious metals that works with no account and no server of ours: preferences, favorites and history stay on your device. This policy describes what the app keeps locally, the network connections it opens (to download rates and, at most twice a day, to learn whether another Aumatex app is out), and what the parties serving them receive.

Koinvert

1. Data Controller

  • Aumatex SRLS — Via Umberto Biancamano 25, 00185 Rome (RM), Italy. VAT IT15617831001. PEC: aumatex@pec.it.
  • Requests about personal data: privacy@aumatex.it.

2. Data Collected

  • Koinvert collects no personal data: there is no sign-up, no login, no Aumatex account and no server of ours to send it to.
  • We do not collect your name, email, phone number, location, device identifiers, usage data, diagnostic data or financial data.
  • The amounts you convert, your favorites and your history never reach us in any form.
  • The app has no in-app purchases and no subscriptions: it handles no payment data.

3. Data Processed Locally on Device

  • Preferences (theme, accent color, language, primary currency, metal unit, haptic feedback, smart decimals, favorites under the result), the last currency pair used and your favorite currencies, in the order you chose, stay on the device. The app icon you pick in Settings › Appearance is remembered by iOS.
  • Koinvert also keeps a few service dates and identifiers on the device, and they never leave the phone: the day of the first launch, which tips about other Aumatex apps you have already opened or closed and when, the version and date of the last rating request, the last version whose What’s New you saw, and which Aumatex apps the App Store has already reported as out, with the time of the last check.
  • History keeps, for each conversion, the date, amount, currencies, result and metal unit, up to the 200 most recent conversions.
  • The latest downloaded rates are saved in the app’s cache, so a result can be shown even without a connection.
  • You can delete single entries or clear History; Settings › Rates and data › Clear Data erases history, favorites, preferences and cached rates, sets the accent back to Gold and resets the tips about other apps. The icon you chose stays until you change it, and so do the service dates about ratings, What’s New and released Aumatex apps.
  • Koinvert does not sync this data with iCloud or any other service, and has no widgets or extensions that share it. As with any iOS app, preferences and history may be included in your device backup, if you have turned it on, which Apple manages.

4. Network Connections and Rate Source

  • The app makes no requests to Aumatex SRLS servers: there are none.
  • Exchange rates and cryptocurrency and precious-metal prices come from a single source: Fawaz Ahmed’s currency API, an open-source project whose data is in the public domain (CC0). The app downloads it from the jsDelivr CDN (cdn.jsdelivr.net) and, if that does not respond, from currency-api.pages.dev, hosted on Cloudflare Pages.
  • Each request is a plain HTTPS download of a public file: the list of currencies, or the rate table of one currency identified by its code (for example “usd”, plus “eur” when a cross rate is needed). It contains no amount, no history, no favorites and no identifier.
  • As with any internet connection, the CDN operator receives your IP address, the ordinary technical data of an HTTPS request and the code of the currency requested. Aumatex neither receives nor controls this data, which the operators process under their own policies.
  • Requests are made when you open the converter, when you change either currency, when the “In your favorites” card works out the amount in your currencies, and when you refresh, by pulling down or with Settings › Rates and data › Update Rates; downloaded rates stay valid for one hour before they are requested again.
  • From version 1.5.0, when you open Settings, Koinvert asks Apple’s App Store (itunes.apple.com, its public app lookup) whether the Aumatex apps not yet out are on sale, so they appear in “More from Aumatex” the day they come out. The request carries only their App Store identifiers and the store’s country, taken from the device’s region; it is sent at most twice a day, without cookies, and no longer at all once every app is out. Apple receives the IP address and the usual technical data of the request, handled under its own policy. Tapping one of those apps, or the tip described below, opens its App Store page inside Koinvert, run by Apple. The page is requested from Apple with Aumatex’s developer identifier and a label saying which part of the app you opened it from (for example “koinvert-settings”): Apple uses it to show Aumatex, in App Store Connect, aggregate statistics only, with nothing that identifies you.
  • From version 1.6.0, a tip about another Aumatex app may appear at the foot of the converter and of History. It is chosen entirely on the device, from the pair you are converting and the device’s region: the tip downloads nothing, comes from no ad network and tells no one it was shown or closed; if you open it, what is said above about App Store pages applies.
  • About and Credits contain links to Koinvert’s pages on aumatex.it, to the rate source on GitHub and to the CC0 license: they open in your browser only if you tap them, and from then on those sites’ own policies apply.
  • In Settings, Rate Koinvert opens the App Store’s review form and Share Koinvert opens the iOS share sheet with Koinvert’s App Store link, which carries the label “koinvert-share”: you decide whether to send it and to whom. After at least three days of use and ten conversions, at most once per version, Koinvert may show the system rating prompt: Apple runs it, and any rating you leave is published and handled by Apple.

5. Clipboard

  • The app writes to the clipboard only when you copy the result of a conversion.
  • Koinvert never reads the contents of the clipboard.

6. Device Permissions

  • Koinvert asks for no permissions: no camera, photos, location, contacts, microphone or notifications.

7. No Tracking, Analytics or Advertising

  • No telemetry, no analytics tooling, no third-party crash reporting.
  • No advertising SDKs, no profiling, no advertising identifier (IDFA). The app’s privacy manifest declares to Apple no tracking and no data collected.
  • The app ships no third-party dependencies: only our own code and Apple frameworks.
  • The app’s diagnostic messages stay in the device’s system log and are not sent to us.

8. Legal Basis and Retention

  • Aumatex SRLS processes no personal data through Koinvert: it does not receive it, store it, or have access to it.
  • If you write to us at supporto@aumatex.it, we use the data in your message only to reply to you (Art. 6(1)(b) GDPR); requests to exercise your rights sent to privacy@aumatex.it are handled to comply with a legal obligation (Art. 6(1)(c) GDPR). In both cases we keep the data for 12 months from the last contact.
  • Local data stays on the device until you delete it in the app; uninstalling the app removes it.

9. Recipients and Transfers Outside the EU

  • We disclose no personal data to third parties, because we receive none.
  • The operators of the CDNs that distribute the rates (jsDelivr and Cloudflare) receive the device’s IP address, as with any web request. Their infrastructure is global, and the request may be served from servers outside the European Union.
  • Apple receives the device’s IP address for the App Store lookup described in section 4 and when you open an App Store page or the rating prompt from the app, on its own infrastructure, which may be outside the European Union.
  • The app transfers no personal data to Aumatex SRLS servers, in the EU or elsewhere.

10. Your Rights

  • You can exercise access, rectification, erasure, restriction, objection and portability by writing to privacy@aumatex.it.
  • For the data that stays on your device you exercise those rights directly: you can view and delete it in the app, without going through us.
  • You have the right to lodge a complaint with your data protection authority.

11. Minors

  • Koinvert collects no personal data from anyone, minors included.

12. Changes to this Privacy Policy

  • Aumatex SRLS may update this policy: the date at the top of the page marks the latest revision.

13. Contacts

  • Privacy: privacy@aumatex.it.
  • Support: supporto@aumatex.it.
  • Aumatex SRLS — Via Umberto Biancamano 25, 00185 Rome (RM), Italy. VAT IT15617831001. PEC: aumatex@pec.it.