DataTally
Know how much data your Mac uses.
Live speeds, daily totals, and a per-app breakdown, No setup, zero configuration required.
Download for macOS Coming soon, for macOS 14 Sonoma or later
What is it?
DataTally answers three questions: how fast is my connection right now, how much data have I used, and which app is using it.
Per-app breakdown
See which apps and services used how much data today. Helper and background processes are attributed to the app responsible for them.
Live speeds at a glance
Current download and upload throughput with a rolling sparkline.
Daily & weekly history
Today's totals persist across restarts, and a seven-day chart shows how your usage trends. Hover any day for the download/upload split.
Zero configuration
Open it once and it just works.
Lightweight
A native Swift app that idles at a fraction of a percent of CPU.
VPN-aware totals
Counts physical interfaces only, so VPN tunnels don't double-count your traffic.
Questions & answers
How do I check which apps are using data on my Mac?
Click the DataTally icon in the menu bar. The Apps section lists today's usage per app, sorted by total, with live transfer rates for apps that are active right now.
Does it work with a VPN?
Yes. System totals are measured on your physical network interfaces (Wi-Fi, Ethernet, cellular), so an active VPN doesn't double-count traffic. The VPN's tunnel process appears in the app list alongside the apps it relays, exactly as Activity Monitor reports it.
Will it help me stay under a data cap?
Daily totals and the seven-day history make it easy to see how you're tracking.
Does it need administrator rights or special permissions?
No. DataTally reads standard macOS statistics that any app can access. No kernel extensions, system extensions, or configuration profiles involved.
Is my usage recorded when DataTally isn't running?
No, it only measures while running. Turn on Launch at Login in the gear menu to keep tracking continuously.