Privacy policy
Who is responsible
The controller of personal data on https://marginsimple.com is Refura sp. z o.o., ul. Kalwaryjska 69/9, 30-504 Kraków, Poland, KRS 0001216794, NIP 6793354195. You can reach us about anything in this policy at hello@marginsimple.com.
The numbers you type
The calculators run entirely in your browser. The values you enter are not sent to us and we don't store them. They appear in the page address only so that you can bookmark or share a result.
Your browser's local storage keeps two small things for convenience: your chosen currency and, if you watched a rewarded ad, the time your unlocked tools expire. Nothing else, and none of it is sent to us. You can clear it at any time in your browser settings.
What we and our partners process
| What | Why | Legal basis | How long |
|---|---|---|---|
| Server logs: IP address, browser, pages requested, time | Running the site, security, abuse prevention | Our legitimate interest, Art. 6(1)(f) GDPR | Up to 30 days, unless needed to investigate an attack |
| Advertising cookies and identifiers (Google) | Showing and measuring ads, including personalised ads | Your consent, Art. 6(1)(a) GDPR | Until you withdraw consent or the cookie expires |
| Non-personalised ads with limited data (Google) | Showing ads and preventing ad fraud when you don't consent to personalisation | Our legitimate interest, Art. 6(1)(f) GDPR | As set by Google |
| Emails you send us | Answering you | Our legitimate interest, Art. 6(1)(f) GDPR | As long as needed to handle the matter, then up to 3 years for possible claims |
Advertising and consent
The site is free because it shows ads served by Google Ireland Limited (Google AdSense and Google Ad Manager). When you first visit from the EEA, the UK or Switzerland, a consent banner asks whether Google and its partners may use cookies to personalise ads. You can say no and still use every calculator. You can change your choice at any time through the "Privacy and cookie settings" link that the consent banner adds to the page.
Some tools offer to unlock extras if you choose to watch an ad. Watching is always optional, and the calculators themselves work without it.
Google explains how it uses data from partner sites at policies.google.com/technologies/partner-sites. You can turn off personalised ads across Google at myadcenter.google.com.
Who receives data
Our hosting provider, Hetzner Online GmbH, Germany, which processes server logs on our behalf. Google Ireland Limited and the advertising partners shown in the consent banner, for ads. Google may transfer data to the United States; Google LLC is certified under the EU–US Data Privacy Framework, and Google also uses the European Commission's standard contractual clauses.
Fonts and other files
Fonts, scripts and styles are served from our own domain. Loading a page does not contact Google or any other third party until advertising is allowed to load.
Embedded calculators
Other websites can embed our calculators. The embedded versions show no ads and set no cookies. Your browser still contacts our server to load them, which creates the normal server log entry described above.
Your rights
You have the right to access your data, to have it corrected or deleted, to restrict or object to its processing, and to data portability. Where we rely on consent, you can withdraw it at any time without affecting what was done before. Write to hello@marginsimple.com.
You can also complain to the supervisory authority. In Poland that's the President of the Personal Data Protection Office (Prezes Urzędu Ochrony Danych Osobowych), ul. Stawki 2, 00-193 Warszawa, uodo.gov.pl. If you live elsewhere in the EU, you can contact your local authority.
Automated decisions
We don't make decisions about you based solely on automated processing that have legal or similarly significant effects.
Changes
If we change this policy, we'll update the date at the top. Significant changes will be shown on the site.