# Aviation Weather Decoder vs B737 Maintenance Mastermind

The clearest difference is update cadence: B737 Maintenance Mastermind at every 3 days against Aviation Weather Decoder's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Aviation Weather Decoder sells 1 in-app purchase, starting at $0.99 per month and B737 Maintenance Mastermind sells 4 in-app purchases, starting at $8.99 per year. Whichever you choose, the download price is not the number that matters.

Aviation Weather Decoder ships an update every 2 months, B737 Maintenance Mastermind every 3 days. The most recent releases landed on November 5, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Aviation Weather Decoder | B737 Maintenance Mastermind |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 days** |
| Size | 8 MB | 10 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [阳 何](https://appshunter.io/developer/6777476774) | [Nemanja Dimitrijevic](https://appshunter.io/developer/1732443666) |

## What reviewers say

### Aviation Weather Decoder

[App page](https://appshunter.io/ios/app/aviation-weather-decoder/id6787396332)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Metar Decoder Premium | $0.99 | per month |


### B737 Maintenance Mastermind

[App page](https://appshunter.io/ios/app/b737-maintenance-mastermind/id6819862964)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Yearly | $8.99 | per year |
| Lights & CB Lifetime | $6.99 | one-time |
| Lifetime Upgrade | $12.99 | one-time |
| Premium Lifetime | $17.00 | one-time |


## Frequently asked questions

### Is Aviation Weather Decoder free?

Aviation Weather Decoder is free to download, with in-app purchases available.

### Is B737 Maintenance Mastermind free?

B737 Maintenance Mastermind is free to download, with in-app purchases available.

### Do Aviation Weather Decoder or B737 Maintenance Mastermind have ads?

Neither Aviation Weather Decoder nor B737 Maintenance Mastermind shows ads.

### Which is updated more often, Aviation Weather Decoder or B737 Maintenance Mastermind?

Aviation Weather Decoder ships an update every 2 months, and B737 Maintenance Mastermind every 3 days. Most recently, Aviation Weather Decoder was updated on November 5, 2026 and B737 Maintenance Mastermind on November 6, 2026.

---

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