iStat Menus vs mectrics

iStat Menus is a macOS menu bar utility from Bjango that displays detailed, real-time system information, including CPU and GPU load per core, memory pressure, disk activity and S.M.A.R.T. health, network bandwidth by app, battery and connected Bluetooth device levels, and hardware sensor temperatures and fan speeds. Modules can be combined or split across multiple menu bar icons to match a user's monitoring priorities. Beyond hardware stats, iStat Menus adds world clocks, weather forecasts, and customizable, rules-based notifications for thresholds like high CPU temperature or low battery. The app is privacy-focused, with no ads, analytics, or tracking, and is sold as a one-time license or included with a Setapp subscription.

mectrics is a lightweight, open-source system monitor that lives in the macOS menu bar and displays real-time hardware metrics including CPU, memory, battery, network, disk, GPU, temperature, and fan speed. Users can customize which metrics are visible, set alert thresholds for specific values, and click any item to open a detailed popover showing granular data like per-core CPU load or disk throughput. A "Compact Health" mode folds the entire machine's status into a single menu bar item that stays quiet until something needs attention, and the app processes everything locally with no network requests, so nothing leaves the Mac. It is distributed under the MIT license, supports headless automation through command-line tools, and is localized into English, Turkish, Russian, Spanish, French, and Portuguese.

• Extremely detailed, real-time system data not exposed by macOS by default.
• Highly customizable menu bar layout to show only the stats a user cares about.
• No ads, analytics, or tracking in a system monitoring tool that could otherwise justify it.
• Long track record of regular updates for new macOS and Apple Silicon releases.

• Completely free and open source under the MIT license
• No network requests at all, so it works fully offline and privately
• Very small download size at roughly 5 MB
• Includes command-line tools for scripting and automation

• One-time price plus paid upgrades for major new versions.
• Menu bar can get crowded if many modules are enabled at once.
• Some deeper sensor data availability depends on the specific Mac model.

• macOS only, with no Windows or Linux version
• Requires macOS 15 or later, excluding older systems
• As a free open-source project, support depends on community and maintainer availability rather than a formal support team