Convertly — Privacy Policy
Effective: October 28, 2026 · Applies to the Convertly mobile app (unit, currency and everyday calculator app) published by SMARTNESS HOME.
The short version: your conversions, your history, your favorites and your settings are stored on your own device. There is no account, no analytics, and no server of ours holding your data. To convert currencies, the app downloads public reference exchange rates; that request carries nothing about you. The app is free because it shows ads served by Google AdMob. Personalized ads are on by default, and you can turn them off at any time in Settings → Privacy → Personalized ads. If you leave them on, Google selects ads using your device's advertising identifier. That is tracking, and this policy and the App Store privacy label both say so.
1. Who publishes Convertly
Company: SMARTNESS HOME, SAS (French simplified joint-stock company)
Registered office: 5 rue Agrippa d'Aubigné, 91090 Lisses, France
Contact e-mail: contact@smartnesshome.com
Convertly has no website of its own: this page, the Terms of Use and the Support page are hosted here, on the publisher's site. Full publisher details are in our Legal Notice. The app is offered in the United States only, in English.
2. What stays on your device
Everything you enter and everything the app keeps for you is held in a database inside the app's own storage on your phone. That includes:
- your history: each calculation as it was shown (for example "12 ft → 3.6576 m"), the values needed to repeat it, and when you made it;
- your favorites: the conversions you pinned, with their units;
- your settings: theme, number format, decimal places, units, clock format, default currency, the sales tax rate and tip percentage you last used, the cities you compare in Time zones, haptics, history and advertising choices, and — if you watched a video for it — when your ad-free period ends;
- the exchange rates most recently downloaded, so currency conversion keeps working offline;
- two ad counters — how many full-screen ads were shown today and when the last one was — which the app uses to enforce its own limits.
The app also reads your phone's region settings — number format, measurement system, currency, clock format and time zone — to start with sensible defaults. Those stay on the device too.
None of it is transmitted to us. We have no account system, we keep no copy, and we could not restore any of it if you lost it. It is entirely in your hands:
- Settings → History turns history off, sets how long it is kept (7 days, 30 days, 90 days — the default —, 1 year, or forever; never more than 500 entries), or clears it;
- Settings → Your data → Export my data gives you everything as a JSON file, through your phone's own share sheet;
- Settings → Your data → Delete all data erases history, favorites, settings, saved rates and the ad counters — or simply uninstall the app.
3. What leaves your device
Two things, and nothing else:
- Exchange-rate downloads. When you open the currency converter and the saved rates are more than six hours old — or when you ask for an update — the app downloads the European Central Bank's reference rates from Frankfurter, a free public service. The request asks for rates against the US dollar and contains nothing else: not the amounts you convert, not an identifier. Like any request on the internet, it reveals your device's IP address to that server.
- Ad requests to Google, whenever an ad slot is allowed to fill — described in full in the sections below.
Beyond that, the app makes no network call to us at all: we run no server that it talks to. A result leaves your phone only if you send it yourself — Copy places it on your clipboard and Share hands it to your phone's share sheet, where you choose where it goes.
4. Advertising — where ads appear
Convertly is free and supported by advertising served by Google AdMob. Ads appear as a banner at the bottom of the Converters and History lists; as one card labelled "Sponsored" among the tools on the Home screen; occasionally as a full screen when you leave a tool after finishing a calculation — never during your first session, at most three a day and at least five minutes apart; and, only if you tap Watch a short video at the bottom of the Home screen, as a video ad that makes the app ad-free for 24 hours. No ad ever appears inside a converter or calculator, on the Settings screens, during the introduction, or on an error screen, and a full-screen ad never interrupts typing, copying or sharing. There is no paid ad-free mode: the only way to pause ads is that optional video, and no feature ever depends on it.
5. Your choices
| Where | What it does |
|---|---|
| Settings → Privacy → Personalized ads (on by default) | Off, the app asks Google for limited ads: requests are sent as non-personalized and with Google's restricted data processing signal, so Google may select an ad from the context of the request only, not from a profile of you. It applies from the next ad. |
| Google's consent form | Where the law requires a choice before ads are personalized, Google's consent form appears right after the introduction, before any ad is requested. Settings → Privacy → Ad privacy choices, shown whenever it applies, reopens it. |
| iPhone and iPad: Apple's tracking prompt | Asked once, after the introduction, when ads can be shown. If you decline, Google cannot access your device's advertising identifier (IDFA). You can change it later in iOS Settings → Privacy & Security → Tracking. |
| Android: your advertising ID | You can reset or delete it in your device's settings (under Privacy, then Ads, on most phones), independently of anything you set in the app. |
Nothing in the app works any less well whatever you choose.
6. Yes, personalized ads mean tracking
We are not going to tell you there is no tracking. If personalized ads are on and, on iPhone, you allowed tracking, Google receives your device's advertising identifier (the IDFA on iOS, the Advertising ID on Android) and may use it to build and use an advertising profile across apps and websites. That is exactly what Apple means by "tracking", it is what our App Store privacy label declares, and it is a choice we put in front of you rather than something we do quietly.
7. What an ad request carries
These are the data types Google's own advertising SDK declares as collected from apps like this one:
| Data | Detail |
|---|---|
| Device identifier | The advertising identifier. On iOS it is available to Google only if you allowed tracking; on Android it may still be read for frequency capping and fraud prevention when personalized ads are off. |
| Advertising & usage data | Which ad was shown, whether it was seen, tapped or closed, and interactions with the ad unit. |
| Approximate location | Convertly never asks for your location and has no location permission. Google derives an approximate, coarse location from your IP address when it serves an ad — that is how ads are matched to a region. |
| Diagnostics | Crash, performance and other technical data from the ad SDK. |
What an ad request does not carry is anything you type or calculate: no keywords, no page content, no custom targeting. Your amounts, your conversions, your history and your favorites are never put into an ad request.
For advertising, Google acts as an independent controller of the data it receives. Its own handling is described at policies.google.com/technologies/partner-sites and policies.google.com/technologies/ads.
8. What we never collect
We do not ask for your name, address, phone number, e-mail or date of birth — there is no account, so there is no password to lose either. The app never requests location permission. We use no analytics SDK, no crash-reporting SDK and no advertising network other than Google's. We do not read your contacts, your photos, your files, your camera or your microphone.
9. Your US privacy rights
California's CCPA, as amended by the CPRA, gives you the right to know what personal information is collected, to have it deleted, to correct it, and to opt out of its sale or sharing. Comparable rights exist under the laws of Colorado, Connecticut, Delaware, Montana, Nebraska, New Hampshire, New Jersey, Oregon, Texas, Utah and Virginia. We apply the same handling to everyone rather than sorting readers by state.
We do not sell personal information. Personalized ads may count as "sharing" for cross-context behavioral advertising under the CPRA, because Google may use your activity across services to select an ad. Turning off Settings → Privacy → Personalized ads withdraws that sharing from the next ad request onwards. That switch is our opt-out mechanism — you do not have to e-mail anyone to use it.
Because your data never reaches us, a deletion request is satisfied by Settings → Your data → Delete all data, which you can do yourself at any moment. For anything else, write to contact@smartnesshome.com and we will respond within 45 days. We will not treat you differently for exercising any of these rights.
10. Children
Convertly is not directed to children under 13 and we do not knowingly collect personal information from them. The app is not configured as child-directed for advertising purposes; it asks Google to keep ads suitable for a general audience. If you believe a child has provided information to us, write to contact@smartnesshome.com and we will delete it.
11. Security, and its limits
We keep no central store of user data, which removes the thing that most commonly gets breached — there is no database of yours to breach, because there is no database. Exchange rates and ads are fetched over HTTPS. No system is perfectly secure, and data on your phone is only ever as safe as the phone itself: a device passcode and up-to-date software do more for it than anything we could add.
12. Retention
Your history is kept on your device for the period you choose in Settings → History (90 days unless you change it); favorites and settings stay until you remove them; saved exchange rates are replaced at each download. We hold no copy to retain, so there is nothing on our side to expire. What Google retains for advertising is governed by Google's own policies, linked above. See also our site-wide Delete Account & Data page.
13. Changes
If we change what is collected or where it goes, we change this policy on the same day and update the date above.
14. Contact
Privacy questions and requests: contact@smartnesshome.com. Postal address: SMARTNESS HOME, 5 rue Agrippa d'Aubigné, 91090 Lisses, France.