# MEL Expiry Calc vs B737 Maintenance Mastermind

The clearest difference is ads: B737 Maintenance Mastermind at none against MEL Expiry Calc's shown. B737 Maintenance Mastermind also leads on update cadence (every 3 days vs every 2 months). MEL Expiry Calc's advantage is iOS requirement (13.0 vs 18.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. MEL Expiry Calc sells 1 one-off in-app purchase 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.

MEL Expiry Calc 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 | MEL Expiry Calc | B737 Maintenance Mastermind |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 3 days** |
| Size | 29 MB | 10 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Adria Raventos ruiz](https://appshunter.io/developer/1876663356) | [Nemanja Dimitrijevic](https://appshunter.io/developer/1732443666) |

## What reviewers say

### MEL Expiry Calc

[App page](https://appshunter.io/ios/app/mel-expiry-calc/id6759302113)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $2.99 | one-time |


### 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 MEL Expiry Calc free?

MEL Expiry Calc 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 MEL Expiry Calc or B737 Maintenance Mastermind have ads?

MEL Expiry Calc shows ads; B737 Maintenance Mastermind does not.

### Which is updated more often, MEL Expiry Calc or B737 Maintenance Mastermind?

MEL Expiry Calc ships an update every 2 months, and B737 Maintenance Mastermind every 3 days. Most recently, MEL Expiry Calc was updated on November 5, 2026 and B737 Maintenance Mastermind on November 6, 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.*