Mister Plimsoll
Mister Plimsoll is a free macOS menu bar utility that monitors disk usage on selected volumes and alerts you before they become too full.
What is Mister Plimsoll?
Mister Plimsoll is a native macOS utility for monitoring available storage on your Mac’s internal, external, and backup volumes. It helps users avoid running out of disk space by watching selected drives and notifying them when usage crosses a threshold they set. The app lives in the menu bar, making it easy to check current status without opening a larger dashboard, and it supports different alert levels for different volumes. Notifications can be delivered through macOS alerts and notifications, email, Pushover, and webhooks for services such as Slack, Discord, IFTTT, and Zapier; the direct-download edition also supports iMessage alerts. Developed by Glenn Fleishman, Mister Plimsoll is intended for Mac users who want an early warning system for storage pressure on workstations, laptops, external SSDs, or Time Machine destinations.
Key features
- Monitor internal, external, and backup volumes for disk usage
- Set a separate fullness threshold for each monitored drive
- Receive alerts through macOS notifications or floating alert windows
- Send notifications by email, Pushover, or webhooks to services like Slack and Discord
- View current drive status from the menu bar
- Limit how many alerts are sent per day for each volume
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Safety overview
Status: Safe
Mister Plimsoll is a legitimate disk monitoring utility for macOS. Its normal activity is checking storage usage on volumes you choose to monitor and sending alerts through the notification methods you enable. If you configure email, messaging, or webhook alerts, the app will handle the related account or destination details needed for those notifications, so use only channels you trust and review those settings before sharing alerts externally. Removing the app stops monitoring and notifications but does not affect the contents of your drives.
Recommendation: Keep Mister Plimsoll if you want automatic warnings before a Mac drive or backup disk becomes too full. If you no longer use its alerts or prefer to check storage manually in macOS, you can remove it without harming your files; you would only lose its monitoring settings and future notifications.
Common paths
/Applications/Mister Plimsoll.app
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