Privacy

Applies to the GLanSync desktop app (macOS and Windows) and to this website.

GLanSync is a local-first desktop utility for compatible Govee LAN devices. It controls your lights directly over your local network. There is no account and no cloud sync; your screen contents, audio, colors, and network details never leave your computer.

What the app does by default

It reports anonymous feature-usage counts (since 0.6.1) — events like "screen sync started" with the app version, OS platform, and license status, sent to PostHog (EU). The only identifier is a random install ID: never your devices, IPs, network names, screen contents, audio, or license keys. Settings → Privacy → "Share anonymous usage data" turns it off.
Since 0.6.8, three of those events carry slightly more so that failures can be found without asking anyone to file a bug report: how many devices a scan found (since 0.6.10 three numbers — the total, how many the app can drive in realtime, and how many of those are models Govee lists as colour-streaming that have not been tested here; never which devices, their models, names or addresses), why a scan found nothing (since 0.6.10, one word from a fixed list: nothing answered, the operating system blocked every packet, or the reply port could not be opened), and why a sync could not start (one word from a fixed list: no realtime-capable device in the group, permission refused, capture failed, the lights did not answer, or none of those). The underlying error message is deliberately not sent, because error text can contain device names and file paths.
Since 0.6.11 one further event counts that you pressed “try it anyway” on a model Govee does not list as accepting colour streaming. It carries no model number: the list of models you have forced on stays in a file on your own computer and is never sent anywhere.
It does not require a Govee cloud API key for normal LAN control.
It talks to your lights over the local network once LAN Control is enabled for them in Govee Home.
It stores your settings locally on your computer.
Apart from the license check and the configuration check described below, it makes no internet requests.

Remote configuration check

At launch and roughly every 6 hours, the app fetches a small configuration file over HTTPS from glansync.com (with a public GitHub URL as fallback). That file carries licensing parameters — whether paid licensing is enabled, store identifiers, the purchase page URL — and the latest available app version.

The request is a plain GET: no identifiers, no cookies, no query parameters, no telemetry. The server sees only the standard metadata any web request carries. If the check fails or the file is missing, the app keeps its last cached copy, or falls back to built-in defaults.

License activation

If you buy a license, activation and periodic validation go to Lemon Squeezy, our merchant of record, and only when a license key is in use. The request carries your license key and a machine name so the activation limit can be enforced. Purchases, receipts, VAT and license-key delivery are handled by Lemon Squeezy under their privacy policy. The app works fully offline afterwards.

Local network data

The app sends and receives local UDP packets for discovery, status checks and light commands, and may inspect local network interface information to identify likely Govee LAN devices. Device identifiers, local IP addresses, SKUs, group names and group membership are stored locally so your setup is restored on the next launch. None of it leaves your computer.

Screen capture

Screen Sync samples pixels from the screen or window you select in order to calculate LED colors. Those pixels are processed locally inside the app; nothing in the app uploads screen content. macOS requires Screen Recording permission before capture works; Windows requires no screen-capture permission.

Microphone and system audio

Microphone and system-audio modes analyze audio locally to calculate lighting frames, using frequency and volume data only. Nothing in the app uploads audio. Microphone mode requires the operating system's microphone permission. On Windows, system audio uses native loopback capture, analyzed locally like every other audio source.

This website

glansync.com uses Google Analytics 4 for basic traffic measurement (page views, visitor counts, referrers). GA sets first-party cookies to distinguish visitors; we use ads-free defaults and never send your name, email, or anything you type. You can block it with any content blocker without affecting the site. The site is served through Cloudflare, which processes standard request metadata (such as IP address and user agent) to deliver the page and protect the origin, and our web server keeps standard access logs. Downloads are hosted on GitHub and are subject to GitHub's own policies once you follow a download link.

Telemetry policy

Usage analytics is limited to the anonymous envelope described above, is always disclosed here before release, stays separable from normal local LAN control, and can be turned off in Settings (or with the GLANSYNC_TELEMETRY=0 environment variable). Crash reporting, if ever added, follows the same rules.

Contact

Questions: [email protected]