Google account access audit
Review third-party apps with access to your Google Account.
Use Google's connections page to review app access, then use KeepKnown to audit Gmail senders without message-body scanning.
Google's connections page shows apps and services that have account access. Review permissions, remove apps you no longer trust, and audit Gmail sender risk separately.
Short answer
Substack may be sign-in, linking, or account-data access.
Google's third-party connections page shows whether Substack uses Sign in with Google, a linked account, or access to Google Account data. Ghost Audit answers the next question: how much outsider mail still reaches Gmail after the access review.
What to check before removing Google access
Connection type
Check whether Substack or another app uses Sign in with Google, a linked account, or access to Google Account data.
Google products
Look for access to Gmail, Contacts, Drive, Calendar, Photos, or other account data.
Current need
Remove access when you no longer trust or use the service, knowing some features may stop working.
Password safety
Do not share your Google Account password with third-party apps; use Google's consent flow instead.
Gmail exposure
After permissions are clean, run the free audit to measure known versus unknown senders in recent Gmail traffic.
Ongoing screening
Use KeepKnown when unknown senders should move away from the inbox automatically after the audit.
Privacy boundary
Ghost Audit does not read email bodies or change Gmail.
The audit uses Gmail metadata and contacts to count known versus unknown senders. It does not label, archive, delete, send, or inspect message body content.
Questions before you connect.
Why does Substack show under account access?
It can appear when you sign in with Google or grant Google-related permissions. Review the access level in your Google Account.
Related inbox workflows
Google access audit
Review app access and count risky outsider senders.