MainframeMonitor
Retro CRT System Monitor
Free · Designed for iPad. Not verified for macOS.
A retro mainframe for your iPhone: live CRT monitor in glowing green or amber phosphor, a home screen widget and classic games.
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 hasn’t received enough ratings or reviews to display an overview.
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
- Seller
- Ralf Langhoff
- Size
- 23.3 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+
- Copyright
- © 2026 Ralf Langhoff