# Days Between Dates Calculator vs B737 Maintenance Mastermind

The clearest difference is price: B737 Maintenance Mastermind at Free against Days Between Dates Calculator's $2.99. B737 Maintenance Mastermind also leads on update cadence (every 2 days vs every 22 months). Days Between Dates Calculator's advantage is in-app purchases (none vs 2). On ads, device support and iOS requirement there is nothing between them.

B737 Maintenance Mastermind is free to download; Days Between Dates Calculator costs $2.99 up front. B737 Maintenance Mastermind sells 2 in-app purchases, starting at $8.99 per year. Days Between Dates Calculator asks for nothing beyond the download.

Days Between Dates Calculator ships an update every 22 months, B737 Maintenance Mastermind every 2 days. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Days Between Dates Calculator | B737 Maintenance Mastermind |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/days-between-dates-calculator/id1639840560/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 22 months | **Every 2 days** |
| Monetization | Paid | — |
| Size | 1 MB | 10 MB |
| Requires iOS | **17.6** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Heng Jia Liang](https://appshunter.io/developer/1532000635) | [Nemanja Dimitrijevic](https://appshunter.io/developer/1732443666) |

## What reviewers say

### Days Between Dates Calculator

[App page](https://appshunter.io/ios/app/days-between-dates-calculator/id1639840560)

Instantly calculate the number of days, months, and years between any two dates. Features include live current date tracking, inclusive/exclusive counting modes, and saving past calculations. Supports multiple languages and offers a clean, intuitive interface.

**Highlights:** Instant date calculations, Live current date tracking, Inclusive & exclusive modes, Save & review history, Weekday display, Tap to copy result, Multi-language support

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

**In-app purchases:** none


### B737 Maintenance Mastermind

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

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Yearly | $8.99 | per year |
| Premium Lifetime | $17.00 | one-time |


## Frequently asked questions

### Is Days Between Dates Calculator free?

Days Between Dates Calculator costs $2.99, with no in-app purchases.

### Is B737 Maintenance Mastermind free?

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

### Do Days Between Dates Calculator or B737 Maintenance Mastermind have ads?

Neither Days Between Dates Calculator nor B737 Maintenance Mastermind shows ads.

### Which is updated more often, Days Between Dates Calculator or B737 Maintenance Mastermind?

Days Between Dates Calculator ships an update every 22 months, and B737 Maintenance Mastermind every 2 days. Most recently, Days Between Dates Calculator was updated on November 3, 2026 and B737 Maintenance Mastermind on October 31, 2026.

---

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