MainframeMonitor
Retro CRT System Monitor
Free · Designed for iPad. Not verified for macOS.
Turn your iPhone into a nostalgic mainframe terminal—with system information, widgets, retro games, and an authentic CRT atmosphere.
Turn your iPhone into a mainframe from the golden age of computing.
MAINFRAME MONITOR shows your device's live stats wrapped in a nostalgic CRT console – complete with phosphor glow, scanlines, a boot sequence and satisfying key clicks. Choose between classic GREEN or warm AMBER, each with its own matching app icon.
■ LIVE SYSTEM MONITOR
• Battery, CPU, memory and free storage
• Uptime, network status and device info
• All in real time, right on the glowing screen
■ HOME SCREEN WIDGET
• Keep your key system stats always in view
• In the same retro CRT style
■ REAL MAINFRAME FEELING
• Authentic boot sequence on launch
• Scanlines, glow and CRT effects
• Terminal-style PF function-key controls
■ HIDDEN CLASSIC GAMES
• Snake, Hamurabi, Void Patrol and Bagels
• Text-based retro games, just like on the old terminals
■ FAIR & PRIVATE
• Completely free
• No ads, no trackers, no accounts
• All data stays on your device
Whether as a stylish system monitor, a home screen widget or a hands-on piece of computing history – MAINFRAME MONITOR brings back the charm of the old data centers.
Made with attention to detail. Be sure to check out my other apps right inside the app.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
Version 1.5 makes Mainframe Monitor more personal than ever. Customize your console with selectable panels, flexible ordering, and practical presets. Show or hide the Syslog as needed, and restore the original layout at any time.
Also new: an advanced Temporal Reference with local time, UTC, Unix epoch, and Julian date, plus live display geometry and motion sensor data. Monitor pitch, roll, yaw, G-forces, and rotation rates—all presented in an authentic mainframe style.
The developer, Ralf Langhoff, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Size
- 24.7 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Provider
Ralf Langhoff
- Ralf Langhoff has not identified itself as a trader for this app. If you are a consumer in the European Economic Area, consumer rights do not apply to agreements between you and the provider.
- Copyright
- © 2026 Ralf Langhoff