What is secinitd?

secinitd is a security process that runs each time you open an app on your Mac.

What is secinitd?

The name stands for "security initialisation daemon". It sets up the security rules for an app before the app itself starts running. This means checking the app is genuine, and applying sandbox rules if the app uses them.

What does it do?

When you open an app, secinitd does the following:

• Applies the app's sandbox profile, if the app is sandboxed
• Checks the app's code signature is valid
• Sets up the security rules the app must follow

All of this happens before the app's own code runs. The app starts inside the right security boundary from the first moment.

Why does it matter?

Sandboxing is a key macOS security feature. A sandboxed app can only reach the files, hardware, and system features it has been given permission to use. secinitd puts those limits in place at launch.

Does it slow things down?

No. The checks take only a few milliseconds. You will not notice any delay.

Should you worry?

No. It is a normal macOS process that keeps apps inside their proper security limits.

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