Privacy Policy

Last updated: 10 November 2026

Apostrophe· is a French spelling practice app, available on iOS and Android, on our website and as a plugin in ChatGPT, published by LMT Digital Creations. Your privacy is a priority. This policy explains what data is processed, how, why, and what your rights are.

1. Data created on your device

Basic use of Apostrophe· requires no account. The following data is created and stored locally on your device, and in your private iCloud (on iOS, if sync is enabled):

• Profile: level, regional variant, preferences
• Dictation cards, attempts, scores, progress (spaced repetition)
• Audio files cached locally
• Usage counters (free dictations remaining, streak)

On iOS, iCloud sync is handled by Apple via CloudKit and stays in your private space. On Android, this data stays on the device. Without an account, none of this is saved on our server; with an account, your progress is also backed up there (see section 2).

2. Account (optional)

If you subscribed on our website, you can sign in inside the app to restore your access, profile and progress. Only in that case do we process:

• Sign-in credentials via Firebase Authentication (Google): your email address, or your "Sign in with Apple" identifier.
• Cloud profile via Firebase Firestore (Google): the first name, goal, level, regional variant and difficulty points you provided.
• Your progress on our own server: your profile (first name, level, regional variant, goal, difficulty points, daily goal, streak, date of your last session), the dictation cards you have worked on with their review state, and for each corrected dictation the date, the score, the rule and the mistakes found (word written, correct word, explanation). The full text of your answers is never saved.

This data is used only to restore your profile, Premium access and progress across your devices. It is kept as long as your account exists. You can delete your account and this data at any time from Settings > Account > Delete my account: your progress is then erased from our server at the same time.

3. Analytics and attribution

To understand how the app is used and where installs come from, we use:

• Firebase Analytics (Google): aggregated, pseudonymous usage statistics (screens viewed, key actions).
• AppsFlyer: install attribution, that is, knowing which marketing campaign led to a download.

These tools receive neither the content of your dictations nor your profile data. On iOS, any tracking for advertising purposes is enabled only with your explicit consent (App Tracking Transparency).

4. Content generation (third-party services)

Apostrophe· uses the following services to generate the learning content:

• OpenAI (GPT API): generates the dictation sentences and the explanations, and corrects the texts you write in the Write tab. OpenAI's policy.
• ElevenLabs (text-to-speech): audio playback of the sentences. ElevenLabs' policy.

These calls go through a secure proxy server. No API key passes through your device, and for a dictation only the sentence text is sent, with no personal data.

In the Write tab, the text you write is sent to OpenAI to be corrected, once you agree. In the app, we do not keep it on our server: it stays on your device and, on iOS, in your private iCloud. On the website, your text, its prompt and its correction are saved on our server with your account, so you can find them again. You can delete each text at any time, and deleting your account erases them all. Avoid including sensitive personal information.

5. Subscriptions and purchases

Subscriptions and purchases are handled by the platforms: Apple (App Store), Google (Google Play), or, for a subscription taken out on the web, through our payment provider. Premium access rights are managed with RevenueCat. We have no access to any payment information (bank card), which is processed directly by these platforms.

6. Notifications

If you enable notifications, they are scheduled locally on your device. No notification token is sent to our servers.

7. Website

Our website uses Google Analytics to measure traffic, only after your consent via the cookie banner. If you decline, no measurement cookie is set.

If you also accept advertising in the banner, three advertising tools run on the website and on the sign-up flow:

• the Meta pixel tells Meta which pages you visit, a click to the App Store or Google Play, an account creation or a move to payment, without the content of your answers. Meta uses it to measure our ads and to show them to you on Facebook and Instagram;
• the TikTok pixel sends the same information to TikTok, which uses it to measure our ads and show them to you on TikTok;
• Google receives your advertising consent through Google Analytics (Consent Mode) and may show you our ads on its services.

They never load on the pages for primary school pupils (CE2, CM1, CM2). If you decline, nothing is sent to Meta or TikTok, and Google receives no advertising consent.

Change my cookie choice

8. ChatGPT plugin

In ChatGPT, the Apostrophe· plugin shows a card: a French spelling rule with a quiz, the rules behind your mistakes, or a 10-question spelling test. It works without an account. This section describes everything it receives, returns and keeps.

What ChatGPT sends us. ChatGPT calls the plugin and passes it the data, depending on the tool:

• explain_rule (explain a rule): the id of the rule to show, picked from our list of 80 rules, for example "homophones-a-a".
• review_my_mistakes (the rules behind your mistakes): after ChatGPT has corrected a text you wrote, the list of your mistakes, 12 at most. For each one: the word or words as you wrote them, their correct form and the rule involved, 120 characters at most per field. Never your conversation or your whole text.
• spelling_test (spelling test): no data.

Every call comes from OpenAI's servers, not from your device: we receive neither your IP address, nor your name, nor your email address. ChatGPT adds technical information: the name of the client software, the protocol version and sometimes hints such as the language, the type of device or an approximate region. The plugin keeps only the client name and the protocol version, in the log described below, and does not use the rest.

What the plugin returns. The content of the card: the key point of the rule, two examples, the usual trap, the quiz questions and links to our website. For your mistakes, the card repeats the mistaken words and their correction received from ChatGPT, three at most per rule. This content goes back to ChatGPT, which shows it in your conversation. The quiz answers are passed to the card only, not to the model.

In the card. The card does not contact our server. Your quiz answers and your score stay in ChatGPT: the card keeps them in your conversation and passes your score and the questions you missed to ChatGPT, so it can help you next. We do not receive them.

Purposes. The data received is used only to build the card you asked for. The technical log is used to count how often each tool is used and to fix errors. No plugin data is sold, or used for advertising, profiling or training an AI model. Legal basis: providing the service you request by using the plugin, and our legitimate interest for the technical log.

Recipients. The plugin calls no outside service and no AI, and passes this data to no third party. It runs on our server, at our host Hostinger. The content of the card is returned to OpenAI, which shows it in ChatGPT.

Retention. The words and rules received are not saved: they are processed for the time of the answer, then erased. The only record is a technical log, one line per call: the date, the tool used, the rule id or the number of rules shown, the client name and the protocol version. It contains neither your words, nor your text, nor any identifier of a person, and each line is deleted after 12 months at the latest. As for any web page, our host also keeps its own server logs (calling IP address, here OpenAI's, date, address requested) for the security of the server.

Your controls.

• You can disconnect the plugin at any time in ChatGPT's settings: ChatGPT no longer calls it.
• When you have a text corrected, avoid putting sensitive personal information in it: ChatGPT only sends us the mistaken words, but they are your words.
• Your quiz answers stay in your conversation: you erase them by deleting the conversation in ChatGPT.
• We keep nothing that could identify you, so no plugin data can be linked to you. For any question, write to us at info@apostrophe-app.fr.
• The card's links open our website, where section 7 and your cookie choice apply. The "Créer mon plan" link tells the website you come from the plugin (src=chatgpt): if you then create an account, this origin is saved with your account (section 2).

Your use of ChatGPT itself, including how long your conversations are kept, is governed by OpenAI's privacy policy.

9. Storage and security

• Local data is stored on your device (SwiftData on iOS) and in your private iCloud via CloudKit.
• Account data (if you create one) is hosted by Google Firebase.
• Your progress (if you have an account) is stored on our server, at our host Hostinger. Each user can only access their own data.
• Cached audio files are purged automatically after 30 days of inactivity.
• Communications between the app, our proxy server and third-party services are encrypted via HTTPS.

10. Children's data

Apostrophe· may be used by children in a school or family setting. Basic use requires no account and the app contains no advertising. Usage statistics are aggregated and pseudonymous, and are not used for advertising profiling.

11. Your rights

Under the GDPR, you have the right to access, rectify and delete your data.

• Account data and progress: Settings > Account > Delete my account, or write to us.
• Local data: uninstall the app.
• iCloud data: Settings > your account > iCloud > Manage Storage > Apostrophe·.

12. Changes

This policy may be updated. The last modification date is shown at the top of this page. Significant changes will be announced via an app update.

13. Contact

For any question about this policy:

LMT Digital Creations
Email: info@apostrophe-app.fr