Privacy policy

Version of 10 November 2026. This policy describes what data flutter.su collects, why, and how you can control it. Personal data is processed in accordance with Russian Federal Law No. 152-FZ of 27.07.2006 “On Personal Data”.

1. Who is responsible for the data

The operator is the owner of flutter.su. Contact: contact@flutter.su .

2. What the site does not collect

The site has no registration, sign-in, comments or forms. It doesn't ask for your name, email address, phone number or payment details. If you write to us by email, we use your address and message only to reply.

3. What is stored in your browser

To make the lessons convenient, the site keeps some settings in your browser's storage (localStorage). This data stays on your device — the site doesn't send it anywhere:

• which lessons you marked as completed;
• your choices in the interactives: system, editor, where to run the app, the sample project settings;
• for the ad break in the interactives — in which video and when you passed it (so it isn't shown in the same video more than once every 5 hours);
• your choice in the cookie consent window.

You can delete this data at any time by clearing the site data for flutter.su in your browser settings.

4. Visit statistics — only with your consent

To understand which lessons people read and what to improve, the site uses:

• Yandex Metrica (Yandex LLC) — including the click map and Session Replay (Webvisor), which records actions on the page: scrolling, clicks, mouse movements;
• Google Analytics (Google).

These services receive anonymised information about the visit: which pages were opened, where you came from, your device and browser type, IP address, and they set their own cookies. The services process this data under their own rules: Yandex Metrica terms , Google Privacy Policy . Google's services are located outside Russia, so the data Google Analytics receives is transferred abroad.

The counters load only after you consent to cookies of the “analytics” category. Without consent they don't load, and the site works fully.

5. YouTube videos

Some articles embed YouTube videos (a Google service). The player loads only after you consent to cookies of the “marketing” category: when it loads, YouTube receives information about your device and may set its own cookies. Without consent the video doesn't load — you can open it via the link directly on YouTube.

6. Ads

The site currently has no ad networks: the interactives show a placeholder instead of an ad. If ads appear, they will load only with your consent to cookies of the “marketing” category, and this policy will be updated.

7. How to change or withdraw consent

On your first visit the site asks for cookie consent. You can change or withdraw it at any time via the “Cookie settings” link at the bottom of any page.

8. Your rights

You can find out what data of yours is processed, ask to correct or delete it, or withdraw consent to processing — write to contact@flutter.su . Data collected by Yandex Metrica, Google Analytics and YouTube is stored by those companies — you can also delete it with their tools.

9. Children

People of any age can use the site. The site doesn't collect data about children separately.

10. Changes

A new version of the policy is published on this page; the version date is given at the top. The previous version was in effect from 25 February 2019.