Privacy policy.

Lumen does not require a sign-in, an email, or any identifier. There is no cloud sync, no backup to our servers, and no server to speak of. We do not have your reading, your questions, your answers, or your browsing activity, because none of it is ever sent to us.

Lumen stores the following inside the app’s sandboxed container:

• The text of pages you spend time reading, in a SQLite database with a full-text index
• The topic and site each page is filed under
• Summaries the model writes for each page, and an overview for each site
• Sentence embeddings used to find related pages
• Your highlights

Questions you ask in the Ask panel, and the answers to them, are held in memory and never saved. The library is excluded from iCloud and device backups. You can wipe it at any time from Settings → Delete All Knowledge.

Lumen’s web engine is Apple’s WKWebView, configured with hardened defaults:

• Trackers on the Disconnect list blocked by default, through WebKit content rules
• Third-party cookies blocked while Block Trackers is on
• Images and scripts on a page upgraded from HTTP to HTTPS
• Canvas, WebGL, and audio features switched off for the rest of a page when one script reads them three times in ten seconds, a common sign of fingerprinting

The site menu counts the trackers Lumen blocked on the current page. The count is a floor, because requests a page makes from its own scripts are blocked without being counted.

The language model is mlx-community/Llama-3.2-1B-Instruct-4bit, run through MLX Swift. The model weights, roughly 700 MB, are downloaded from Hugging Face the first time the model is needed and cached on your phone. After that, the model runs offline. Questions and answers never leave your phone.

The only network call related to the AI feature is the one-time weight download from Hugging Face. Hugging Face’s privacy policy applies to that single transaction.

Lumen does not include analytics SDKs, crash reporters, A/B testing tools, or marketing pixels. Apart from the pages you visit, it makes three kinds of request:

• The one-time model download from Hugging Face
• Search suggestions: as you type in the address bar, the text is sent to your chosen search engine. Turn this off with Search Suggestions in Settings. Incognito tabs never ask for suggestions.
• Site icons, fetched from each site’s own /favicon.ico without cookies

When you browse the web inside Lumen, websites you visit may still set their own cookies, use their own trackers, and record their own logs, as with any browser. Lumen blocks the trackers it knows about, but it cannot prevent a site from collecting data you submit to it directly.

• Turn off Collect Knowledge to stop saving pages from any site
• Delete a topic, a site, or a single page from the Library, or everything with Delete All Knowledge
• Turn Block Trackers on or off for one site or for all of them
• Turn off Search Suggestions, or turn on Clear History on Close
• Clear history and website data with Clear Browsing Data
• Delete the app, which removes everything Lumen stored on your device