macOS processes

What are ReportCrash and SubmitDiagInfo on Mac?

Q: Where are crash reports on my Mac?

The ReportCrash man page says that reports for apps are in ~/Library/Logs/DiagnosticReports.

ReportCrash saves crash reports on the Mac. SubmitDiagInfo sends diagnostic information to Apple, but only if you opted in.

Process: SubmitDiagInfoProcess: ReportCrashApplies to: macOS 13 Ventura and later for the System Settings path. Seen on macOS 27.2.Checked: 29 October 2026

Where you see it

SubmitDiagInfo is in the list in Activity Monitor › Network, in nettop or in Kilobat.
A firewall or network monitor asks if SubmitDiagInfo can connect.
A short upload appears with no app open.

What it is

The ReportCrash man page says that it analyzes crashing processes and saves a crash report to disk. launchd starts it when a crash occurs.

The SubmitDiagInfo man page says that it runs periodically. If you opted in, it sends recent diagnostic information to Apple.

Why it uses the network

Diagnostic uploads. With Share Mac Analytics on, SubmitDiagInfo sends crash, hang and usage information to Apple.
Reports that you send. When you click Report after a crash, the report goes to Apple.

Is it normal?

Yes, if you share analytics. The uploads are small and periodic.

ReportCrash itself writes to disk. Its man page does not describe network use.

See how much it uses

Open Activity Monitor from Applications > Utilities. Click Network.
Type SubmitDiagInfo in the search field. The Sent Bytes and Rcvd Bytes columns show what it moved.
In Terminal, watch only this process. Press d to show the change per second, and q to quit.
```
nettop -p SubmitDiagInfo -P
```

Reduce or pause it safely

Choose Apple menu > System Settings > Privacy & Security. Click Analytics & Improvements.
Turn off Share Mac Analytics. Turn off Share with app developers too, if you want.
Keep crash reporting itself on. Developers use the reports on your Mac to fix problems.

With Kilobat

Open the Kilobat app list and search for SubmitDiagInfo. Its row shows the live rate and the bytes it moved.
In Terminal, see the same live list. Press / and type the name to search.
```
kilobat status --watch
```
Show its traffic over one day. Names match kilobat report --summary.
```
kilobat bandwidth SubmitDiagInfo day
```
Through MCP, an AI agent gets the same history with get_app_bandwidth and the name SubmitDiagInfo.
The live view is free. History in the app needs Pro. Kilobat records history only while the app runs.

Questions

Where are crash reports on my Mac?

The ReportCrash man page says that reports for apps are in ~/Library/Logs/DiagnosticReports.

Does SubmitDiagInfo send data if I said no?

The man page says that it sends nothing unless you opted in.

Sources

ReportCrash(8) and SubmitDiagInfo(8), man page installed with macOS 27.2
Apple Support: Share analytics information from your Mac with Apple
nettop(1), man page installed with macOS 27.2

Sources checked on 29 October 2026. Man pages are the ones installed with macOS; open one with man <name> in Terminal.