Disk-O

Always-on disk space monitoring

Monitor your Mac's disk utilization at all times and display this information in a variety of ways and styles

Universal build Menu bar app macOS Ventura - Golden Gate Signed & Notarized English Français Deutsch Español
Disk-O screenshot

Flexible Display Options

Choose from 8 different visualization styles and optionally get warnings if free disk space drops too low

Real-Time Storage Stats

View used and available space instantly, without navigating into the Finder or System Settings

Extensive Personalization

Select from 12 distinct menu bar icons for a tailored look

Fast and Minimal

Lightweight app design frees up system resources and minimizes overhead

How Disk-O Compares

Feature / Advantage Disk-O Stats iStat Menus
Core Focus & Scope Focused menu bar disk space monitoring & capacity alerts Comprehensive commercial system hardware & telemetry monitoring suite Comprehensive commercial system hardware & telemetry monitoring suite
Visualization & Customization 8 disk visualization styles & 12 custom menu bar icons 13 system-wide widget styles (mini graphs, bars, pie charts) Extensive menu bar themes, dropdown graphs & stat readouts
Low Space Warnings Dedicated configurable threshold alerts when free disk space drops Live readouts only (No dedicated low-disk threshold alerts) Customizable system notification alert rules
Resource Overhead Minimal CPU & RAM footprint focused solely on disk I/O Modular, can disable active module Moderate background usage (monitors full system state)
Pricing & License Free Fully functional Free & Open Source ~$11.99 Single / Subscription