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Last updated: 30 June 2026

LexiCore is built privacy-first. Core study works fully offline, and your vocabulary lives on your device and your own private iCloud. To enrich your learning, the app uses AI on-device first (Apple Intelligence); when your device can't run it, requests fall back to the LexiCore AI service. You can turn the cloud fallback off any time in Settings.

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The short version

• Core study works fully offline — add words, look up definitions, and practice with no network.
• Your vocabulary is stored on your device and syncs only to your own private iCloud (CloudKit). We never receive or store it.
• No account, no sign-in, no tracking — no ads and no third-party analytics or advertising SDKs.
• AI runs on-device first. When Apple Intelligence isn't available on your device, the app falls back to the LexiCore AI service to generate explanations and examples — sending the word you're studying, a small sample of your saved words, and an anonymous install identifier. Turn off Cloud AI in Settings to keep AI fully on-device.

Your vocabulary

Words you add — definitions, examples, pronunciations, progress, collections, and settings — are stored on your device using Apple's SwiftData. If iCloud is enabled, this data syncs across your devices through Apple's CloudKit private database, which is tied to your Apple Account and not accessible to the developer. You can turn off iCloud sync any time in Settings, and you can delete individual words or reset all data from within the app.

Permissions

LexiCore requests only what a feature needs, when you use it:

• Microphone and Speech Recognition — for pronunciation practice. Speech recognition runs on-device; your voice is not sent to a server.
• Camera and Photo Library — only for the "Words from Photo" feature, to find objects in a picture you choose and turn them into words. Images are analyzed on-device; photos are not uploaded or stored by the developer.
• Notifications — optional local reminders for daily review and streaks, scheduled on-device. No push server is involved.

LexiCore never requests location, contacts, or any tracking permission.

How AI works (on-device first, cloud fallback)

LexiCore uses AI to generate explanations, examples, mnemonics, and similar learning content. This runs on-device first via Apple Intelligence (iOS 26+). When on-device AI isn't available — older iOS, the model isn't installed, or it fails — the app falls back to the LexiCore AI service, a proxy we operate.

• What is sent (cloud fallback only): the word or text you're studying, a small sample of your saved words (for context), and an anonymous install identifier. Requests are sent over HTTPS.
• Why: solely to generate the learning content you requested. We do not use this data to advertise to you, build profiles, or track you across apps, and we do not sell or share it with data brokers.
• Not tied to your identity: there is no account. The install identifier is a random value, not linked to your name, email, or Apple Account.
• Stay on-device: turn off Cloud AI in Settings to disable the cloud fallback entirely. AI then runs only on-device via Apple Intelligence (iOS 26+) or built-in offline content, and nothing is sent.