Comparison

System Rx vs MainframeMonitor

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

System Rx

Features
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System Rx is the professional-grade diagnostic tool designed for power users who need exact hardware transparency. Monitor your system's vitals across iOS, and iPadOS with precise hardware identification and real-time telemetry. Key Features: Precise Hardware Identity: Accurate identification of your device model, chip (including M4, A18 Pro, and A17 Pro), and technical specs. CPU & RAM Monitoring: Monitor processor load and memory footprint in real-time with technical-grade accuracy. System Thermal States: Keep an eye on your device's temperature and thermal throttling status. Storage & Battery: Detailed insights into SSD health, read/write rates, and battery cycles. Privacy First: No telemetry leaves your device. All data is processed locally.

About

MainframeMonitor

Transform your iPhone into a vintage mainframe with a nostalgic CRT display. Monitor live system stats like battery, CPU, and memory, all within an authentic retro console experience. Includes hidden classic text-based games.

Highlights
  • Live system monitoring (battery, CPU, memory, storage)
  • Home screen widgets
  • Authentic CRT effects (glow, scanlines)
  • Retro boot sequence
  • Hidden classic text-based games
  • Customizable color themes (Green, Amber)
Features
Read full description

MAINFRAME MONITOR: Your Device as a Mainframe Console Mainframe Monitor shows your device's real live data in the style of a 1980s IBM operator console: CPU, memory, storage, battery, network, thermal state and motion. All values come from your device. You also get green phosphor text, scanlines, key clicks and real MVS commands. REAL DATA, CLASSIC LOOK • Live CPU load per core, memory, DASD, battery, network and thermal state • Front panel lamp strip that flickers with the load • Seismograph as a moving paper strip. Knock on the table! • Compass, audio output, brightness and refresh rate (ProMotion) • Motion sensors with pitch, roll, yaw and G-vector • Capacity planning: battery time remaining and storage forecast • Session statistics (SMF) with averages and peak values • Clock with UTC, Julian date and 64-bit TOD register FIVE HISTORIC DISPLAYS Press PF5 to switch between green and amber phosphor, the IBM 3279 color terminal, the neon-orange IBM 3290 gas plasma display and the Tektronix 4014 storage tube. Each display has its own effects, from degauss to beam redraw, and a matching app icon. MVS CONSOLE WITH REAL COMMANDS In the syslog you enter commands like a real operator: D T, D A,L, D M=CPU, D U,DASD, D NET, D IPLINFO, D ENV, D CAPACITY, D M=MIPS (CPU benchmark) and many more. With PF8, a virtual IBM 1403 line printer prints a status report on continuous paper that you can share as an image. PARALLEL SYSPLEX Couple iPhone, iPad and Mac on your local network via Bonjour to form a sysplex. The sysplex panel shows CPU, memory and battery of all devices. TRACE ROUTE WITH WORLD MAP PF9 traces the path your data takes to any website. You see every hop with IP, location and round-trip time, plus an ASCII world map of the route. The optional latency panel measures ping, jitter, packet loss and clock drift. IPL, INTRO AND SCREENSAVERS At startup the system boots with an authentic IPL sequence. The screensavers show real values too: control panel, tape drives, core memory, punch cards, printer or oscilloscope. GAMES IN THE COBLIB Hamurabi, Void Patrol, Snake and Bagels: classics in terminal style. WIDGETS AND LIVE ACTIVITY • Widgets for the Home Screen and Lock Screen in three sizes • Control Center button • Live Activity in 3270 style on the Lock Screen and in the Dynamic Island FOR EVERY DISPLAY The layout adapts to iPhone, iPad, Mac and foldable devices like iPhone Duo, stacked or side by side. With a hardware keyboard, F1 to F12 work as PF keys. FULLY CONFIGURABLE Show, hide and reorder panels, or choose a preset: Default, Minimal, Performance, Network or Device. Under PF1, an operator guide in German and English explains every feature. PRIVACY No tracking, no ads, no analytics. The app works offline. Network features only start after you agree (message IEA910A), and you can withdraw consent at any time under PF7. The EXT lamp shows you when data goes to the internet. Note: Job names in the log are simulated. D M=MIPS is an estimate, not an official IBM rating.

Screenshots

System Rx4 screens
MainframeMonitor4 screens

Verdict

The call

System Rx and MainframeMonitor are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

System Rx ships an update every 3 weeks, MainframeMonitor fortnightly. Both last shipped on October 31, 2026.

ScorecardNo meaningful differences
System Rx versus MainframeMonitor: the parameters behind the verdict, then further details
ParameterSystem RxMainframeMonitor
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 3 weeksFortnightly — better
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPad, Mac — betteriPhone, iPad
Requires iOS17.0 — better18.6
Further details — not scored
Size2 MB22 MB
Age rating4+4+
DeveloperMohamed SaudRalf Langhoff

In-app purchases

None

System Rx

No in-app purchases

None

MainframeMonitor

No in-app purchases

Questions

Is System Rx free?
System Rx is free to download, with no in-app purchases.
Is MainframeMonitor free?
MainframeMonitor is free to download, with no in-app purchases.
Do System Rx or MainframeMonitor have ads?
Neither System Rx nor MainframeMonitor shows ads.
Which is updated more often, System Rx or MainframeMonitor?
System Rx ships an update every 3 weeks, and MainframeMonitor fortnightly. Most recently, System Rx was updated on October 31, 2026 and MainframeMonitor on October 31, 2026.

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