Last updated: 24 September 2026
This policy explains what information the Codon One app ("the app") and this website handle, and how. Codon One is developed by Daniel Gebert. We designed the app to need as little of your data as possible — there is no account, no login, and no advertising.
To understand how the app is used and where to improve it, the app sends anonymous usage events to our own server (on the codon-one.com domain). These events include a randomly generated installation identifier (which is not linked to you, your name, or your Apple ID), the app version, your device language, the iOS version, your device model (such as "iPhone 15"), the App Store country of your account (which determines pricing and is not your location), and which features or screens are used. This data cannot be used to identify you.
If you choose to submit feedback or rate the quality of a translation, we receive the rating or text you send, along with the lesson location, app version, language, and date. Please don't include personal information in free-text feedback if you don't want it stored.
If you ask Ribo, the AI study helper in the lessons, the glossary and your questions to review, your question is answered by an AI model made by OpenAI. The app sends your question, the earlier questions and answers in the same conversation, and the title and text of the lesson page (or the glossary term and its definition, or the quiz question with its options, the correct answer and your last wrong answer) to our own server, which passes them to OpenAI to check the question for misuse and to write the answer. Our server does not store your questions or the answers, and the conversation isn't saved on your device either — it ends when you close it. OpenAI processes this data as our service provider under its business terms: it doesn't use the data to train its models and keeps it for up to 30 days to detect misuse, unless the law requires longer (see how OpenAI handles API data). To apply the daily question limit, our server records the anonymous installation identifier with the number of questions asked that day and their cost, and deletes these records after 35 days; the identifier is never passed to OpenAI. If you have unlocked a paid module, Apple's signed purchase record is sent along so the higher limit applies. The app asks for your agreement before your first question. Please don't include personal information in your questions.
In-app purchases are processed by Apple through the App Store. We never see or receive your payment details — no card, bank, or billing information ever reaches us. When you unlock a module, the app sends Apple's signed record of that purchase to our own server, together with the anonymous installation identifier, so we can confirm the unlock and count sales; Apple also reports purchases, refunds, and cancellations to that server directly. This record covers the module bought, the transaction and its date, the price, and the App Store country — never your name, your Apple ID, or any payment information. Which modules you have unlocked is also stored locally on your device.
Your learning progress, quiz results, success rates, bookmarks, flashcard progress, and streaks are stored locally on your device. This information is not sent to us. If you have iCloud device backups enabled, it may be included in your encrypted Apple backup, which is governed by Apple's privacy policy.
If you enable them, the app schedules local reminders and short biology facts directly on your device. No data leaves your device for these notifications.
This website is a set of static pages. It uses no third-party analytics, advertising, or tracking scripts, and sets no advertising or cross-site cookies. To understand whether the website helps people reach the App Store, we count clicks on App Store links with a small first-party script that sends an anonymous event to our own server on the codon-one.com domain. The event includes the page path, language, clicked App Store URL, a broad link location such as "hero" or "footer", and the time of the click.
Free web lessons (codon-one.com/learn). So we can tell whether the free web version of Module 1 is actually helpful — how many people read it, how far they get, and whether the quizzes and flashcards are used — these pages send anonymous usage events to the same first-party server. An event may include the page path, language, how long you spent on the page, how far you scrolled, and whether you completed a quiz (with the score) or opened the flashcards. To count this in aggregate, a random, anonymous identifier is stored in your browser (in its local storage) and sent with these events. It is not a cookie, is not linked to you, your name, or any account, and contains no personal information; you can remove it any time by clearing your browser's site data.
None of the above stores IP addresses, user agents, advertising identifiers, or referrers in our own logs. As with any website, our hosting provider (IONOS) may record standard server access logs (such as IP address and time of request) for security and operation; these are handled by the host.
Codon One is a general-audience educational app and does not knowingly collect personal information from anyone, including children.
Because the data we collect is anonymous, we generally cannot link it to a specific person and therefore cannot retrieve or delete data tied to you individually. If you have questions about your data, contact us at info@codon-one.com and we will help where we can.
We may update this policy as the app evolves. Material changes will be reflected here with a new "last updated" date.
Questions about this policy? Email info@codon-one.com.
