# VoltLog vs MainframeMonitor

The clearest difference is in-app purchases: MainframeMonitor at none against VoltLog's 3. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. VoltLog sells 3 in-app purchases, starting at $9.99 per month. MainframeMonitor asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 10 days. The most recent releases landed on October 6, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | VoltLog | MainframeMonitor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/mainframemonitor/id6809454680/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 10 days | Every 10 days |
| Monetization | — | Free |
| Size | 54 MB | 24 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Filip Rusin](https://appshunter.io/developer/1883368937) | [Ralf Langhoff](https://appshunter.io/developer/1706183785) |

## What reviewers say

### VoltLog

[App page](https://appshunter.io/ios/app/voltlog-battery-logs/id6766874761)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Pro | $9.99 | per month |
| Yearly Pro | $39.99 | per year |
| Lifetime Pro | $99.99 | one-time |


### 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 VoltLog free?

VoltLog is free to download, with in-app purchases available.

### Is MainframeMonitor free?

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

### Do VoltLog or MainframeMonitor have ads?

Neither VoltLog nor MainframeMonitor shows ads.

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

VoltLog ships an update every 10 days, and MainframeMonitor every 10 days. Most recently, VoltLog was updated on October 6, 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.*