Effective date: July 28, 2026
Algorena is an algorithm-learning app for iPhone and iPad, made by Vinh Nguyen ("we", "us"). This policy explains what the app does with your information. The short version: we don't collect anything ourselves, and your learning progress never leaves your device — but the free version shows ads, and Google's ad software collects data to serve them.
We do not collect, transmit, sell, or share your personal data, and we operate no servers of our own.
Your progress stays on your device. What you've watched, predicted, answered and mastered is never uploaded and never used for advertising.
There is no account. Algorena never asks for your name, email, or any sign-in.
The free version shows ads through Google AdMob, which collects device and ad-interaction data to serve and measure them. See "Advertising" below.
Algorena Pro removes all ads. Nothing on this page about advertising applies while Pro is active.
Within the European Economic Area, the United Kingdom, and Switzerland, ads are only personalized if you consent — and you can change that choice at any time.
Every lesson, animation and question in Algorena is built into the app. It needs no network connection to teach you anything, and it makes none of its own. The app keeps the following only on your device:
Learning progress — which lessons you've watched, your prediction and quiz results, mastery per skill, your streak, time spent, and the misconception tags the in-app Coach uses to recommend practice.
Settings — theme, haptics, playback speed, and whether the pseudocode pane is open.
Nothing in that list is transmitted anywhere. You can erase all of it inside the app (Settings → Reset all progress), or by deleting the app.
The free version of Algorena shows ads supplied by Google AdMob (Google Ireland Limited / Google LLC). There are exactly two places they appear:
a full-screen ad after you finish a lesson or a practice round, on your way out of it — never during a lesson, and never over the animation;
an optional video you can choose to watch on the Pro screen, in exchange for 24 hours of access to one locked lesson.
Buying Algorena Pro removes all advertising.
To serve, cap, and measure ads, Google's advertising software collects and processes information from your device, including:
device and app identifiers, such as the Apple Advertising Identifier (IDFA) if you allow tracking, along with a non-personal app-instance identifier if you don't,
device information — model, operating system version, language, and coarse location derived from your IP address (we never request precise location),
ad interaction data — which ads were shown, whether they were viewed or tapped, and whether an ad was fraudulent or invalid.
We never send Google your progress, your answers, or anything derived from them. Google acts as an independent controller of the data it collects for advertising; its handling is governed by the Google Privacy Policy and the Google Advertising Policies. We do not receive any of it in a form that identifies you — only aggregate earnings and performance figures.
Tracking. iOS asks for your permission before the app can use the Advertising Identifier to track you across apps. If you decline, ads still appear but are not personalized. You can change this any time in Settings → Privacy & Security → Tracking.
Consent (EEA, UK, Switzerland). Before any ad loads, we show Google's certified consent form covering advertising purposes and Google's ad partners. You can reopen it any time from Algorena's Settings → Ad privacy choices.
Remove ads entirely. Purchase Algorena Pro. Ads stop immediately and no further ad requests are made.
A 24-hour lesson pass earned by watching a video is granted only on your device, and is not stored or reported anywhere. Watching a video tells us nothing about you.
Algorena Pro is a one-time purchase processed entirely by Apple through the App Store. There is no subscription and nothing renews. We never see your payment details. The app only learns, on your device, whether Pro is active so it can unlock the advanced lessons. Refunds are handled by Apple.
If you have opted in to share analytics with app developers (an iOS-level setting), Apple may provide us with aggregated, anonymized statistics such as download counts or crash reports. These contain nothing that identifies you and no record of what you studied.
Algorena is not directed at children under 13, and we do not knowingly collect personal data from them. Because the free version serves advertising, it is not intended for use by children under 13; ads are not requested with child-directed treatment.
If the app's behavior ever changes in a way that affects your privacy, we will update this policy and its effective date before the change ships.
Questions about privacy? Email vinhnguyen30062002@gmail.com.