Lexikon Privacy Policy

Effective date: August 26, 2026

Lexikon is a reading app for children with no sign-up, no accounts, and no ads. This policy explains, plainly, what little data the app does handle and why.

The short version

• There is no account, login, or sign-up of any kind.
• We never collect a child's name, email address, photo, location, or any other personal information.
• No ads are shown, personalized or otherwise.
• Nothing is ever sold or shared with advertisers or data brokers.
• Reading content and progress are stored on your device — an anonymous, device-scoped identifier is used only for the limited purchase and diagnostic data described below.

Information we collect

Because Lexikon has no accounts, there is no personal profile to build. The only data the app sends off-device is a small set of anonymous usage events, tied to a random identifier generated on your device (via Firebase Anonymous Authentication) — not to your name, email, Apple ID, or any other identity.

Anonymous event log

The app records when a small number of specific things happen, so we can understand overall usage and fix problems — never what a specific child reads or how they use the app moment to moment:

• Onboarding completed — which languages were activated, and, optionally, how you heard about Lexikon (a skippable question; skipping is recorded as "unspecified," not left blank).
• Free article limit reached — which language's free limit was hit.
• Paywall viewed — that the upgrade screen was shown.
• Purchase completed — which subscription or plan was purchased (a product identifier only — no card number, billing address, or other payment details ever pass through Lexikon; see "Purchases," below).
• Diagnostics — aggregated crash and performance summaries from Apple's own on-device MetricKit framework, so we can find and fix bugs.

Every one of these events is tied only to the random anonymous identifier above, is write-only from the app's side (the app itself never reads this data back), and is never shared with or sold to advertisers, data brokers, or any other third party. It exists purely so we can look at aggregate numbers — how many households complete onboarding, whether a purchase flow is working — not to build a profile of any individual child or household.

Content delivery

Reading content (articles) is downloaded from our cloud storage over a standard, unauthenticated connection — the same way any app downloads its content. This connection does not carry any personal information; it's simply how the app fetches which articles exist and their text.

What we deliberately don't do

• No accounts, sign-up, login, or password of any kind
• No third-party analytics SDKs
• No third-party advertising SDKs, and no ads shown at all
• No cross-app or cross-website tracking
• No selling or sharing of data with advertisers or data brokers
• No collection of precise location, contacts, photos, or microphone/camera access

Purchases

All purchases (subscriptions and the one-time lifetime unlock) are handled entirely by Apple through StoreKit. Lexikon never sees or stores your payment card number, billing address, or Apple ID password — Apple processes the transaction and simply tells the app whether you're entitled to premium content. Refunds, subscription management, and billing questions are handled through your Apple ID account settings, not through Lexikon.

Children's privacy

Lexikon is designed for children and their families. Because the app collects no personal information from anyone — child or adult — there is no personal data to inadvertently gather from a young user. We do not knowingly collect personal information from children under 13 (or the relevant age of consent in your region), consistent with the Children's Online Privacy Protection Act (COPPA) and similar laws elsewhere.

Your rights

Because there's no account and no personal identifier tied to a real identity, there is no personal profile for us to show you, export, or delete on request — there simply isn't one to begin with. If you have questions about what limited anonymous data the app does send (described above), or about your rights under GDPR, UK GDPR, or other applicable privacy law, contact us using the details below.

Third-party infrastructure

Lexikon's backend runs on Firebase (a Google Cloud product) for anonymous authentication, the event log described above, and content storage. This is first-party infrastructure we operate and control — data written there is our own, not shared with Google or any other party for their own purposes, and is architecturally different from embedding a third-party analytics or advertising SDK, neither of which this app uses.

Changes to this policy

If this policy changes, the effective date at the top of this page will be updated. We'll make a reasonable effort to note material changes clearly.