DataTally
Know how much data your Mac uses.
Live speeds, daily totals, and a per-app breakdown, right in your menu bar. There's nothing to set up.
Download for macOS Coming soon · Free 14-day trial, then $9.99 once · 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 count toward the app that owns 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.
Pricing
$9.99, one time. No subscription. Try every feature free for 14 days first; you don't need an account or a credit card to start.
Buy DataTally One license, all your Macs · License key by email, activates offlineQuestions & 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 the same network statistics that macOS offers every app, so it doesn't need kernel extensions, system extensions, or configuration profiles.
What happens when the trial ends?
Nothing dramatic. Live speeds and today's total keep working for free, forever. A one-time $9.99 license unlocks the per-app breakdown and the seven-day history. The key arrives by email and activates offline, so the app still never touches the network itself.
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.