The short version. Lumen does not collect your name, email, phone number, contacts, photos, location, or any data that identifies you personally. We collect anonymous product usage events to understand which features are used and to improve the app. We do not track you across other apps or websites. We do not sell or share data with advertisers.
What we collect
Anonymous product analytics
When you use Lumen, the app sends anonymous events to our analytics provider (PostHog) describing actions you take in the app. Examples:
- App was launched
- The flashlight was toggled on or off, in which mode (flash or screen) and effect (steady, strobe, pulse, SOS, candle)
- A color preset was selected
- The paywall was shown, or a purchase was attempted, succeeded, or failed
- A custom color was added or removed
- Whether your device has a torch (LED), and whether it is iPhone or iPad
Each event is associated with a device-scoped pseudonymous identifier generated by the analytics SDK. This identifier is not linked to your Apple ID, your email, your IP address (which is dropped), your IDFA, or any persistent identifier across other apps. It cannot be used to identify you.
The brightness slider value is bucketed (0%, 25%, 50%, 75%, 100%) before being sent. Custom color values are not transmitted in events.
In-app purchase information
If you purchase Lumen Pro, Apple's StoreKit handles the transaction. Lumen receives an anonymous receipt from Apple confirming the purchase. We do not see your name, email, payment method, or billing address — Apple does not share any of that with us.
Diagnostic data (Apple)
If you have opted in to share diagnostics with developers in iOS Settings → Privacy & Security → Analytics & Improvements, Apple may share crash logs and device performance metrics with us. This is governed by Apple's privacy policy, not ours.
What we don't collect
- Your name, email address, phone number, or contacts.
- Your location (coarse or precise).
- Photos, videos, microphone, or other media. Lumen requests camera permission in order to drive the LED only — no images or video are captured.
- Your IDFA (Identifier for Advertisers). Lumen does not show ads, and does not request App Tracking Transparency permission.
- Browsing history or activity in other apps.
How we use the data
- Improve the product. We use aggregated, anonymous usage data to understand which features are popular, where users get stuck, and which premium features convert best.
- Process purchases. Apple uses your purchase information to fulfill your in-app purchase. Lumen uses the resulting receipt to unlock Pro features on your device.
- Diagnose problems. If a feature throws an error, anonymous error events help us locate and fix it.
We do not use the data for advertising, profiling, or any decision that produces legal effects on you.
Third-party services
PostHog (analytics)
We use PostHog to receive and analyze the anonymous events described above. Events are sent over HTTPS to us.i.posthog.com. PostHog acts as a data processor on our behalf and is bound by their privacy policy.
Apple StoreKit (purchases)
In-app purchases are handled by Apple's StoreKit. Apple's privacy practices apply.
Data retention
Anonymous event data is retained for up to 12 months for trend analysis. Aggregated counts (with no per-event detail) may be retained longer. You can reset the device-scoped analytics identifier by going to Settings → Reset settings in Lumen, or by deleting and reinstalling the app — this generates a new identifier and disconnects future events from past ones.
Your rights
Because we don't collect personal data, there is no account or profile to access, correct, or delete in the traditional sense. You can:
- Reset your local data at any time via Settings → Reset settings inside the app, or by deleting Lumen.
- Request a record of any data tied to your device-scoped identifier by emailing us. To do this we'll need the identifier — open the app at least once before requesting so we have something to look up.
- Request deletion of any data tied to your device-scoped identifier by emailing us.
If you are in the EU, UK, California, or another jurisdiction with comprehensive privacy laws, the standard rights under those laws apply (access, rectification, deletion, portability, objection, restriction). Requests can be made by email below.
Children
Lumen is rated 4+ on the App Store. The app is appropriate for general audiences and does not knowingly collect personal information from anyone, including children under 13.
International transfers
Anonymous event data is processed on PostHog's US infrastructure. By using Lumen you consent to this processing.
Changes to this policy
If we change how Lumen collects or uses data, we'll update this page and bump the effective date at the top. For material changes we'll also surface a notice inside the app on the next launch.
Contact
Questions, requests, or concerns about privacy can be sent to hello@dokustudio.com. We try to respond within 7 days.