# ATL Jet Fuel Calculation vs Study Timer

The clearest difference is price: Study Timer at Free against ATL Jet Fuel Calculation's $0.99. ATL Jet Fuel Calculation's advantage is in-app purchases (none vs 3) and iOS requirement (14.0 vs 17.6). On update cadence, ads and device support there is nothing between them.

Study Timer is free to download; ATL Jet Fuel Calculation costs $0.99 up front. Study Timer sells 3 one-off in-app purchases. ATL Jet Fuel Calculation asks for nothing beyond the download.

ATL Jet Fuel Calculation ships an update every 2 months, Study Timer monthly. The most recent releases landed on September 22, 2026 and July 23, 2026 respectively.

## The numbers

| Metric | ATL Jet Fuel Calculation | Study Timer |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/study-timer-shadow-task/id6737145799/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | — | Free |
| Size | 1 MB | 9 MB |
| Requires iOS | **14.0** | 17.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Zlatko Blagus](https://appshunter.io/developer/1551579898) | [Curvachip LLC](https://appshunter.io/developer/1774903560) |

## What reviewers say

### ATL Jet Fuel Calculation

[App page](https://appshunter.io/ios/app/atl-jet-fuel-calculation/id1551579896)

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

**In-app purchases:** none


### Study Timer

[App page](https://appshunter.io/ios/app/study-timer-shadow-task/id6737145799)

This app helps you focus on tasks with customizable timers, motivational quotes, and visual progress tracking. It prioritizes user privacy by storing all data locally on your device. Features include Pomodoro timers, repeating sessions, and lock screen integration.

**Highlights:** Customizable timed tasks, Dynamic Island and Live Activity integration, Pomodoro timer with customizable cycles, Repeating sessions scheduling, Visual progress tracking chart, Motivational quotes, No data collection

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cup of Coffee | $2.99 | one-time |
| Pomodoro Patron | $4.99 | one-time |
| Deep Work Donor | $9.99 | one-time |


## Frequently asked questions

### Is ATL Jet Fuel Calculation free?

ATL Jet Fuel Calculation costs $0.99, with no in-app purchases.

### Is Study Timer free?

Study Timer is free to download, with in-app purchases available.

### Do ATL Jet Fuel Calculation or Study Timer have ads?

Neither ATL Jet Fuel Calculation nor Study Timer shows ads.

### Which is updated more often, ATL Jet Fuel Calculation or Study Timer?

ATL Jet Fuel Calculation ships an update every 2 months, and Study Timer monthly. Most recently, ATL Jet Fuel Calculation was updated on September 22, 2026 and Study Timer on July 23, 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.*