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    Privacy policy

    LexaFluent Privacy Policy

    Effective date:

    LexaFluent is a web-based vocabulary learning app. Your learner progress is stored in your LexaFluent account and cached locally in your browser for performance. This policy explains what we collect, where it lives, and the choices you have.

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    1. Who we are2. Learner account data and local cache3. Optional analytics (PostHog)4. Cookies and local storage5. Sharing6. Data sources and licenses7. Your choices8. Security9. Changes and contact

    1. Who we are

    LexaFluent is operated by an individual developer.

    You can contact us at admin@lexafluent.com.

    2. Learner account data and local cache

    Your learner progress, review history, and study preferences are stored in your authenticated LexaFluent learner account so they can persist across devices and sessions.

    We also keep a local browser cache of that learner data to make the app load faster. You can export or delete your learner data at any time using the Privacy Settings panel on the dashboard.

    3. Optional analytics (PostHog)

    If you opt in to analytics, we load PostHog (hosted in the EU) to help us understand what features are used and to improve reliability.

    On our public marketing pages, analytics run in a cookieless mode: nothing is read from or written to your device, no profile is created, and each visit is an unlinked anonymous session. Because nothing is stored on your device there, we do not ask for consent on those pages.

    Everywhere else, meaning signing in, signing up, and the app itself, we do not load PostHog, capture events, or set analytics cookies until you accept. If you arrive from a marketing page without having accepted, analytics stop until you do.

    • Basic usage: page views, navigation, and general engagement.
    • App events we send may include pseudonymous identifiers (for example: internal word IDs) and event parameters like feature names, timing, and success/failure.
    • If an error occurs, we may send an analytics error event that can include the error message and a truncated stack trace.

    4. Cookies and local storage

    LexaFluent uses a minimal set of browser storage:

    • Local storage / IndexedDB cache: stores your learner cache, onboarding state, and analytics preference on your device.
    • Optional analytics storage (PostHog): only set if you opt in to analytics. Our public marketing pages never set it, because analytics there are cookieless.

    You can manage analytics through our consent banner, the Privacy Settings panel, or your browser. Choosing “Essential only” (or turning the analytics toggle off) stops PostHog from loading and clears its storage.

    5. Sharing

    • PostHog (optional): receives analytics events if you opt in.

    We do not sell your personal information.

    6. Data sources and licenses

    LexaFluent derives corpus frequency statistics from the Leipzig Corpora Collection web corpus, downloaded from Leipzig Corpora Collection.

    This corpus is licensed under CC BY 4.0. Copyright © 2025 Universität Leipzig / Sächsische Akademie der Wissenschaften / InfAI.

    We process and aggregate the corpus to compute frequency ranks and counts.

    7. Your choices

    • Export learner data: download a JSON export from the Privacy Settings panel while signed in.
    • Delete learner data: remove your learner progress from LexaFluent and wipe the local learner cache for this account.
    • Opt in/out of analytics: control whether PostHog is enabled.

    8. Security

    We use reasonable measures to protect the Service. However, no method of transmission or storage is 100% secure. Because LexaFluent also keeps a browser cache for performance, protecting your device and browser still matters.

    9. Changes and contact

    We may update this policy from time to time. For questions or requests, email admin@lexafluent.com.

    Privacy & data

    Control analytics and manage the learner data stored in your account and on this device.

    Usage analytics
    Allow PostHog to collect usage events and error diagnostics.
    Export your data
    Sign in to export learner account data.
    Delete all data
    Sign in to delete learner account data.