# Study Timer vs Radiation Safety Test Prep

The clearest difference is price: Study Timer at Free against Radiation Safety Test Prep's $14.99. Study Timer also leads on update cadence (every 2 months vs every 5 months) and iOS requirement (15.0 vs 18.5). Radiation Safety Test Prep's advantage is in-app purchases (none vs 5) and ads (none vs shown). On device support there is nothing between them.

Study Timer is free to download; Radiation Safety Test Prep costs $14.99 up front. Study Timer sells 5 in-app purchases, starting at $5.99 per year. Radiation Safety Test Prep asks for nothing beyond the download.

Study Timer ships an update every 2 months, Radiation Safety Test Prep every 5 months. Both last shipped on October 30, 2026.

## The numbers

| Metric | Study Timer | Radiation Safety Test Prep |
| --- | --- | --- |
| Price | **Free** | $14.99 |
| Rating | **[4.5 (14 ratings)](https://appshunter.io/ios/app/study-timer-focus-and-pomodoro/id6444372570/reviews)** | — |
| Number of ratings | **14** | — |
| Positive reviews | 84.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 months** | Every 5 months |
| Monetization | Free with in-app purchases | — |
| Size | 478 MB | 3 MB |
| Requires iOS | **15.0** | 18.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [THOMSON Inc.](https://appshunter.io/developer/492371813) | [Skaggs Media LLC](https://appshunter.io/developer/1836684180) |

## What reviewers say

### Study Timer

[App page](https://appshunter.io/ios/app/study-timer-focus-and-pomodoro/id6444372570)

Enhance your study habits and achieve deep focus with a powerful tracker and timer. Utilize the Pomodoro Technique, calming sounds, and automatic logging to stay motivated and productive. Ideal for students, professionals, and individuals managing ADHD.

**Highlights:** Pomodoro Focus Timer, Automatic Study Tracker, Natural Sounds & Lo-Fi BGM, Study Calendar & Graph View, Exam Countdown, Distraction-Free UI

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium (annual) | $5.99 | per year |
| Premium (3-Month) | $7.99 | per 3 months |
| Premium (Yearly) | $15.99 | per year |
| Premium (lifetime) | $9.99 | one-time |
| Premium (Lifetime) | $29.99 | one-time |


### Radiation Safety Test Prep

[App page](https://appshunter.io/ios/app/radiation-safety-test-prep/id6753153553)

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

**In-app purchases:** none


## Frequently asked questions

### Is Study Timer free?

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

### Is Radiation Safety Test Prep free?

Radiation Safety Test Prep costs $14.99, with no in-app purchases.

### Do Study Timer or Radiation Safety Test Prep have ads?

Study Timer shows ads; Radiation Safety Test Prep does not.

### Which is updated more often, Study Timer or Radiation Safety Test Prep?

Study Timer ships an update every 2 months, and Radiation Safety Test Prep every 5 months. Most recently, Study Timer was updated on October 30, 2026 and Radiation Safety Test Prep on October 30, 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.*