# GasX vs Letter log app

The clearest difference is update cadence: Letter log app at every 2 days against GasX's every 3 weeks. 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.

GasX ships an update every 3 weeks, Letter log app every 2 days. The most recent releases landed on October 30, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | GasX | Letter log app |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Size | 61 MB | 42 MB |
| Requires iOS | **15.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Polla Fattah](https://appshunter.io/developer/1711986394) | [Data Code](https://appshunter.io/developer/1502037320) |

## What reviewers say

### GasX

[App page](https://appshunter.io/ios/app/gasx/id6469449447)

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

**In-app purchases:** none


### Letter log app

[App page](https://appshunter.io/ios/app/letter-log-app/id6797585946)

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

**In-app purchases:** none


## Frequently asked questions

### Is GasX free?

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

### Is Letter log app free?

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

### Do GasX or Letter log app have ads?

Neither GasX nor Letter log app shows ads.

### Which is updated more often, GasX or Letter log app?

GasX ships an update every 3 weeks, and Letter log app every 2 days. Most recently, GasX was updated on October 30, 2026 and Letter log app on October 25, 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.*