Real network speed.
Not estimates.

FluxBit is a Windows network meter that reports the bytes that actually crossed the wire — measured from the kernel's own interface counters, not estimated from samples or simulated by speed-test heuristics.

Coming soon to the Microsoft Store

South Africa first. Other regions following.

FluxBit running in its narrow always-visible strip during a speed test: download and upload meters update live, peer list at centre, theme controls, and a scrolling chart on the right that fills in as traffic flows — FluxBit during a real speed test. Recorded directly from a running build, not a mock-up.

What makes it different

Kernel-truth measurements

U: and D: read from GetIfEntry2Ex interface counters — the same source Task Manager and Performance Monitor use. ETW events from Microsoft-Windows-TCPIP add per-connection breakdowns. No userspace sampling, no estimation.

Self-hosted speed test

The line-speed test posts to a FluxBit-controlled server, not Ookla or Cloudflare. Wire-actual upload bytes are read from the interface counter mid-test, so the number you see is what your ISP delivered — not what your kernel send-buffer absorbed.

No telemetry. No account.

FluxBit ships with zero analytics, zero callbacks, zero phone-home. Your history is stored locally in a SQLite database under %APPDATA%\FluxBit. The speed-test server doesn't log visitor IPs.

Built for Windows

Native Win32 GUI, single executable, ~16 MB. Compiles with Go 1.24. Lives in the system tray. AMOLED-true-black theme for OLED displays. 30 Hz smooth chart scrolling on a 1 Hz sample rate.

Themes and chart styles

FluxBit ships with seven chart visualisations and a light/dark theme switcher. Same data, different reads — pick the one your eyes prefer. Each clip below is a live recording, not a mock-up.

FluxBit chart drawing live traffic as thin lines, on a dark background — **Line** · dark. Minimal, low ink. Reads the trend, not the volume.

FluxBit chart drawing live traffic as discrete vertical bars, on a dark background — **Bars** · dark. One bar per sample. Easy to count, easy to point at.

FluxBit chart drawing live traffic with download above and upload mirrored below the baseline, on a dark background — **Mirror** · dark. Download above the line, upload below. Symmetry shows asymmetric links.

FluxBit on a light theme with the Area chart style, live download and upload filling in over time — **Area** · light. The default style, switched to the light theme.

Three more styles — Stacked, Dots, Step — are available in-app. Pick from the chart-style toggle button on the right.

What we don't do

We don't collect usage telemetry.
We don't store visitor IPs from the speed-test server.
We don't require an account, an email address, or registration.
We don't show ads.
We don't share any data with third parties because we don't have any data to share.

Full Privacy Policy and End User License Agreement available.

Real network speed.Not estimates.