00:0006:0012:0018:0024:00
Drop detected · 21:00 – 23:00
Network monitor · macOS
Your internet's real speed — not the perfect-snapshot one.
VelociBar lives in the macOS menu bar and measures your connection on its own, in the background: real download and responsiveness under load, with a local history you can export.
100%
On your Mac, on-device
2
Measurement engines: Apple networkQuality + CDN
CSV
Full history, exportable
Measurement
Two measurement engines, one honest number.
VelociBar alternates Apple's networkQuality tool with a real download from a global CDN. It measures the performance you actually get while browsing — not an idealized lab number.
Result
Engine
Apple networkQuality
Engine
CDN download
92.4
Mbps
real download
1240 RPM · resp.
1240 RPM · resp.
Responsiveness
Why your video call stutters on a 300 Mbps line.
Speed isn't everything. VelociBar measures responsiveness under load (RPM): how many times per minute your network answers while it's saturated. It's the bufferbloat metric — and it's what decides whether Zoom freezes.
Every test is rated Low, Medium or High — the same scale Apple's own tool uses — so you can tell at a glance whether the problem is speed or stability.
Responsiveness under load
1240
RPM
Low
Medium
High
History
See the pattern, not just the moment.
Every test is saved locally and plotted on a timeline. Spot the 9 p.m. drop, the weekend congestion, or the exact day your connection changed.
Last 24 h · Mbps
Export
Your data, in a CSV that speaks for itself.
Export the full history in one click: timestamp, engine, download, latency and responsiveness. Objective evidence for your ISP — or just for you.
speed_log.csv
timestampsourcedownload_mbpslatency_msresponsiveness_rpm
09:15apple92.4121240
14:30custom88.715980
21:30apple45.186210← drop
23:45custom90.2141110
Your data never leaves your Mac. No accounts, no cloud, no telemetry — every test, every log and every export runs locally.
Questions
Frequently asked questions
What exactly does VelociBar measure?
VelociBar measures real download speed (Mbps) and responsiveness under load (RPM). It alternates two engines: Apple's networkQuality tool and a real download from a global CDN — so it reflects the performance you actually experience, not a lab number under ideal conditions.
What is responsiveness (RPM), and why does it matter?
Responsiveness measures how many round trips your network completes per minute while under load. It's the bufferbloat metric: it explains why a video call stutters or a game lags even when your download speed is high. VelociBar rates it Low, Medium or High.
Does VelociBar upload my data anywhere?
No. All results are stored only on your Mac. There are no accounts, no cloud and no telemetry. You have full control of your data.
Can I export the history?
Yes. VelociBar saves every test to a CSV file with timestamp, engine, download (Mbps), latency (ms) and responsiveness (RPM). You can open or export it in one click — objective evidence for your ISP or for your own tracking.
Does it run in the background?
Yes. VelociBar lives in the menu bar and runs automatic tests at the interval you choose: every 15, 30 or 60 minutes. It also includes a widget so you can see your latest reading at a glance.
What do I need to run VelociBar?
macOS 26 or later. You can download VelociBar from the Apple App Store.