Updated September 20, 2011
Existing log files may be used to summarize where our customers live and what languages they speak, in order for us to understand how to improve f.lux. For instance, if we have a large number of users in France, we might translate the software's user interface to French.
f.lux application and automatic updates
f.lux is an application that runs entirely on your client PC. f.lux performs daily "update checks" for both the MacOS and Windows versions. During this update check, f.lux may transmit cookie information, which does not identify you or your location. However, such information may be used by us to understand how many unique computers have installed f.lux.
All clients provide a way to opt-out of these checks.
For the Linux versions, update checks do not contact us, but instead updates are done with your local Linux repository.
We currently do not transmit your location with automatic updates, and we will notify you if we make a change to this policy.
Activity and Advertising
f.lux does not track your activity or display ads.
If we do offer ads or suggestions for commercial products in a future version, such communications will happen in a web browser and not in the client software.
Communications with Google
We offer a number of ways to find your latitude & longitude. On OS X and Windows, any method that uses a map will access our servers and Google's servers.
Communications with Apple
On the Mac, we let you use Apple's Location Services (similar to how an iPhone finds where you are) to find your location. Apple receives your location information, but we do not.
Other location methods
Methods that require only a zipcode typically do not transmit data (however, you can enter a zip code into Google's map interface.) Manual entry of latitude & longitude does not ever transmit any data.
We may offer other location services from the f.lux client in future revisions. Such geo-IP services (which are common on the Internet) can translate your IP address into a rough location (usually within 100 miles).