Lumen Terms of Service
Last updated: 3 June 2026
These terms govern your use of Lumen, a daily planner app published by Halcytron (SAS). They add to the general Halcytron Terms of Service; if there is a conflict for Lumen, these terms apply. By using Lumen, you agree to them.
Your licence
Halcytron grants you a personal, non-exclusive, non-transferable licence to use Lumen on devices you own or control, for your own use.
Accounts
Lumen creates an anonymous account automatically. You may optionally sign in with your email to secure and sync your data. You are responsible for keeping access to your email and account secure.
Your content
Your planning data is yours. You grant Halcytron only the limited rights needed to store, sync, and process it in order to provide the app's features (including the AI features below). We do not sell your content.
AI features
Lumen offers AI-assisted features (such as the morning briefing and organize). To provide them, your relevant content is processed by a third-party AI provider. AI output may be inaccurate or incompleteand is not professional advice, so use your own judgement and don't rely on it for important decisions.
Acceptable use
- Don't misuse, overload, or attempt to break the service.
- Don't use Lumen for unlawful purposes.
- Don't reverse engineer, resell, or redistribute the app except as permitted by law.
Purchases & subscriptions
Any paid features are sold and billed through the Apple App Store or Google Play. Refunds, renewals, and cancellations follow that store's policies.
Availability & warranty
Lumen is provided "as is". We work to keep it reliable but cannot guarantee it will always be available, error-free, or that AI-generated content will be accurate, to the fullest extent permitted by law.
Liability
To the extent permitted by law, Halcytron is not liable for indirect or consequential damages. Nothing here limits liability that cannot be limited under applicable law.
Termination
You can stop using Lumen and delete your account at any time from within the app. We may suspend access in case of serious misuse.
Governing law
These terms are governed by French law, without prejudice to mandatory consumer-protection rules of your country of residence.
Contact
Questions about Lumen: contact@halcytron.com.