# EbbyCalc vs MainframeMonitor

The clearest difference is update cadence: MainframeMonitor at every 10 days against EbbyCalc's every 9 months. EbbyCalc's advantage is iOS requirement (13.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

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

EbbyCalc ships an update every 9 months, MainframeMonitor every 10 days. The most recent releases landed on October 8, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | EbbyCalc | MainframeMonitor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/mainframemonitor/id6809454680/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 10 days** |
| Monetization | — | Free |
| Size | 1 MB | 24 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ansel Rognlie](https://appshunter.io/developer/1489769922) | [Ralf Langhoff](https://appshunter.io/developer/1706183785) |

## What reviewers say

### EbbyCalc

[App page](https://appshunter.io/ios/app/ebbycalc/id1489769923)

**In-app purchases:** none


### MainframeMonitor

[App page](https://appshunter.io/ios/app/mainframemonitor/id6809454680)

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:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is EbbyCalc free?

EbbyCalc is free to download, with no in-app purchases.

### Is MainframeMonitor free?

MainframeMonitor is free to download, with no in-app purchases.

### Do EbbyCalc or MainframeMonitor have ads?

Neither EbbyCalc nor MainframeMonitor shows ads.

### Which is updated more often, EbbyCalc or MainframeMonitor?

EbbyCalc ships an update every 9 months, and MainframeMonitor every 10 days. Most recently, EbbyCalc was updated on October 8, 2026 and MainframeMonitor on October 14, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*