Google account access audit
Why Substack appears in third-party apps with Google Account access.
If Substack appears in Google third-party connections, it may be Sign in with Google, a linked account, or access to Google Account data. Review the connection details first, then run a Gmail metadata audit to see how many unknown senders still reach your inbox.
Why Substack may appear in Google third-party apps
Substack can appear in third-party apps with access to your Google Account because you used Sign in with Google, linked an account, or granted access to Google Account data. The important step is not guessing from the app name; open the connection details and check what kind of access exists.
What are third-party apps with access to your Google Account?
Google describes third-party apps and services as companies or developers that are not Google. They can request different levels of access, including basic profile information, Sign in with Google, linked account connections, or access to Google Account data.
How to review and remove access
- Open your Google Account third-party connections page.
- Find Substack or any other app you no longer use or trust.
- Open the connection details and check whether it has Sign in with Google, linked account access, Gmail, Contacts, Drive, or other permissions.
- Remove access when you no longer need the connection.
- After the access review, audit Gmail exposure separately so you know how many outside senders still reach the inbox.
Why a Gmail audit is the next step
Removing stale app access reduces account risk. It does not tell you whether unknown senders are still reaching Gmail every day. KeepKnown's Ghost Audit checks sender headers and contacts to count known versus unknown senders without reading email bodies or changing Gmail.
Sources: Google manage third-party connections help and Google third-party access help.
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 Google third-party apps with account access?
It may appear because you used Sign in with Google, linked an account, or granted access to Google Account data. Open the connection details to see the exact access type.
Where can I see third-party apps with access to my Google Account?
Open your Google Account third-party connections page. Google lets you review Sign in with Google, linked accounts, and apps or services that have access to Google Account data.
Can third-party apps request access to Gmail or Contacts?
Yes. Google says third-party apps and services can request access to Google products including Gmail, Drive, Calendar, Photos, and Contacts.
How do I remove third-party access to my Google Account?
Go to your Google Account third-party connections page, select the app or service, review the details, and remove access if you no longer trust or use it.
Does removing Google access delete data inside the third-party app?
No. Removing access stops the connection to your Google Account, but data already shared with the third-party service may need to be managed on that service's site.
Does Ghost Audit read email bodies or change Gmail?
No. Ghost Audit uses Gmail metadata and contacts to count known versus unknown senders. It does not read message bodies and cannot label, archive, delete, or send messages.
Related inbox workflows
Google access audit
Review Substack access, then count risky outsider senders.