Lumen Privacy Policy

This policy describes how Lumen, a daily planner app published by Halcytron (SAS), handles your information. The data controller is Halcytron; see the legal notice for our identity and contact details.

Accounts

You can use Lumen with an anonymous account that is created automatically and identified by a random ID, not your name. If you choose to secure or sync your account, you can sign in with Apple or Google. In that case we receive an account identifier from the provider and, depending on the provider and your choices, your name and email address (Apple may provide a private relay email instead of your real one). We use this only to authenticate you and link your data to your account.

Data we process

• Your planning data: categories and items (tasks, notes, dates) you create, stored so they sync to your account.
• Account identity: only if you sign in — the identifier, and name/email, provided by Apple or Google.
• Usage analytics: an anonymous install identifier and basic in-app events (for example app opens, when a feature is used, or when the upgrade screen is shown), so we can understand how Lumen is used and improve it. These are first-party only.
• Subscription status: if you buy a premium plan, the status of that purchase (see Purchases below).
• App preferences: settings and language.

Lumen does not include third-party advertising or cross-app tracking, and we do not sell your data.

AI features

Some features (such as the morning briefing and "organize") use AI. When you use them, the relevant planning content is sent to our AI processor, OpenRouter, to generate suggestions. This content is processed to return a result and is not used to show you ads. AI output can be imperfect, so please review it before relying on it.

Where your data is stored (sub-processors)

We rely on the following providers to run Lumen:

• Supabase: database, authentication, analytics storage, and backend hosting. Your account and planning data are stored in the European Union (Frankfurt, Germany).
• OpenRouter: AI processing for the features above.
• RevenueCat: management of in-app purchases and subscriptions (purchase and subscription status tied to your account identifier).
• Apple App Store / Google Play: app distribution and payment processing for any purchases.

Your account and planning data are stored in the European Union (Frankfurt). Some processors (the AI provider OpenRouter, subscription management via RevenueCat, and the app stores) may process limited data outside the EEA; where that happens, appropriate safeguards such as the EU Standard Contractual Clauses are applied.

Purchases

Any paid features are sold and billed by the App Store or Google Play, and managed through RevenueCat. Halcytron does not receive your payment card details. RevenueCat processes your purchase history and subscription status, linked to your account identifier, so we can unlock the features you paid for.

Retention & account deletion

We keep your data while your account exists.

To delete your Lumen account and all associated data: in the app, open Settings → Account → Delete account and confirm. Deletion takes effect immediately. If you no longer have the app installed, email contact@halcytron.com from your account email address and we will delete your account for you.

Deleted permanently: your account, all tasks and notes, categories, schedules, your profile, and notification settings (including any push token).

To delete only some of your data without closing your account: delete individual tasks or notes in the app (swipe the item and tap Delete — immediate and permanent), or email contact@halcytron.com to request deletion of specific data.

Retained: usage analytics are de-identified — your account identifier is removed, so those events are no longer linked to you; purchase and transaction records are kept by the app stores and RevenueCat as required for tax and legal compliance. You may also uninstall Lumen at any time.

Your rights

Under the GDPR you may request access, correction, deletion, or portability of your personal data, and may object to or restrict certain processing. Contact contact@halcytron.com. You also have the right to lodge a complaint with the French data-protection authority (CNIL).

Children

Lumen is not directed at children under 15.

Contact

Privacy questions: contact@halcytron.com.