# monitorCat vs Gallons to Liters

The clearest difference is price: monitorCat at Free against Gallons to Liters's $1.99. monitorCat also leads on ads (none vs shown) and update cadence (fortnightly vs every 12 months). On in-app purchases and device support there is nothing between them.

monitorCat is free to download; Gallons to Liters costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

monitorCat ships an update fortnightly, Gallons to Liters every 12 months. The most recent releases landed on November 6, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | monitorCat | Gallons to Liters |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Fortnightly** | Every 12 months |
| Size | 8 MB | 20 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Wei Zhao](https://appshunter.io/developer/981750643) | [JanoGroup LLC](https://appshunter.io/developer/1781461557) |

## What reviewers say

### monitorCat

[App page](https://appshunter.io/ios/app/monitorcat/id1385674787)

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

**In-app purchases:** none


### Gallons to Liters

[App page](https://appshunter.io/ios/app/gallons-to-liters/id6742208973)

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

**In-app purchases:** none


## Frequently asked questions

### Is monitorCat free?

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

### Is Gallons to Liters free?

Gallons to Liters costs $1.99, with no in-app purchases.

### Do monitorCat or Gallons to Liters have ads?

Gallons to Liters shows ads; monitorCat does not.

### Which is updated more often, monitorCat or Gallons to Liters?

monitorCat ships an update fortnightly, and Gallons to Liters every 12 months. Most recently, monitorCat was updated on November 6, 2026 and Gallons to Liters on October 4, 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.*