# JTools vs Flight Day/Night Calculator

The clearest difference is price: Flight Day/Night Calculator at Free against JTools's $2.99. JTools's advantage is in-app purchases (none vs 3) and update cadence (every 2 days vs every 3 weeks). On ads, device support and iOS requirement there is nothing between them.

Flight Day/Night Calculator is free to download; JTools costs $2.99 up front. Flight Day/Night Calculator sells 3 in-app purchases, starting at $0.99 per month. JTools asks for nothing beyond the download.

JTools ships an update every 2 days, Flight Day/Night Calculator every 3 weeks. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | JTools | Flight Day/Night Calculator |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 3 weeks |
| Size | 25 MB | 63 MB |
| Requires iOS | 17.1 | **16.0** |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Ben Cornett](https://appshunter.io/developer/1676874460) | [Christopher Browne](https://appshunter.io/developer/1833825731) |

## What reviewers say

### JTools

[App page](https://appshunter.io/ios/app/jtools/id6446237049)

**Features:** Vision Pro support

**In-app purchases:** none


### Flight Day/Night Calculator

[App page](https://appshunter.io/ios/app/flight-daynight-calculator/id6751175138)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $0.99 | per month |
| Pro Annual | $4.99 | per year |
| Pro Lifetime | $12.99 | one-time |


## Frequently asked questions

### Is JTools free?

JTools costs $2.99, with no in-app purchases.

### Is Flight Day/Night Calculator free?

Flight Day/Night Calculator is free to download, with in-app purchases available.

### Do JTools or Flight Day/Night Calculator have ads?

Neither JTools nor Flight Day/Night Calculator shows ads.

### Which is updated more often, JTools or Flight Day/Night Calculator?

JTools ships an update every 2 days, and Flight Day/Night Calculator every 3 weeks. Most recently, JTools was updated on October 30, 2026 and Flight Day/Night Calculator on October 28, 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.*