# Encyclopedia of Tanks vs Sterile Processing Prep

The clearest difference is price: Encyclopedia of Tanks at Free against Sterile Processing Prep's $2.99. Encyclopedia of Tanks also leads on update cadence (every 6 days vs every 2 months) and ratings volume (13 vs 1). Sterile Processing Prep's advantage is in-app purchases (none vs 1) and rating (5.0 vs 4.6). On ads and device support there is nothing between them.

Encyclopedia of Tanks is free to download; Sterile Processing Prep costs $2.99 up front. Encyclopedia of Tanks sells 1 one-off in-app purchase. Sterile Processing Prep asks for nothing beyond the download.

Sterile Processing Prep holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Encyclopedia of Tanks has 13 ratings behind it against 1, so its average is the more settled of the two.

Encyclopedia of Tanks ships an update every 6 days, Sterile Processing Prep every 2 months. The most recent releases landed on October 24, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Encyclopedia of Tanks | Sterile Processing Prep |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | [4.6 (13 ratings)](https://appshunter.io/ios/app/encyclopedia-of-tanks/id1124568778/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sterile-processing-prep/id6757114416/reviews)** |
| Number of ratings | **13** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 2 months |
| Monetization | **Free** | Paid |
| Size | 147 MB | 5 MB |
| Requires iOS | **15.0** | 26.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 9+ |
| Developer | [Good Spider, LLC](https://appshunter.io/developer/1487595667) | [Tracy Gates](https://appshunter.io/developer/1065459770) |

## What reviewers say

### Encyclopedia of Tanks

[App page](https://appshunter.io/ios/app/encyclopedia-of-tanks/id1124568778)

Explore a vast collection of articles and high-definition photos detailing tanks from A-Z. This educational tool offers engaging content for all ages, featuring a simple interface and offline access for on-the-go learning.

**Highlights:** Thousands of articles and pictures, HD photos, Simple organization and UI, Offline availability, Badge collection system, Suitable for all ages

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $2.99 | one-time |


### Sterile Processing Prep

[App page](https://appshunter.io/ios/app/sterile-processing-prep/id6757114416)

This app offers structured practice tools and flashcards to help users learn and review sterile processing knowledge. It is designed for certification preparation and real-world practice reinforcement, with all content available offline from the start.

**Highlights:** Domain-based practice quizzes, Flashcards with explanations, Timed and untimed quiz modes, Mock-style exam practice, Score tracking and progress review, Weakest-area study targeting, Offline access

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

**In-app purchases:** none


## Frequently asked questions

### Is Encyclopedia of Tanks free?

Encyclopedia of Tanks is free to download, with in-app purchases available.

### Is Sterile Processing Prep free?

Sterile Processing Prep costs $2.99, with no in-app purchases.

### Which has better reviews, Encyclopedia of Tanks or Sterile Processing Prep?

Sterile Processing Prep is rated higher. Encyclopedia of Tanks averages 4.6 out of 5 from 13 ratings, while Sterile Processing Prep averages 5.0 from 1 ratings.

### Do Encyclopedia of Tanks or Sterile Processing Prep have ads?

Neither Encyclopedia of Tanks nor Sterile Processing Prep shows ads.

### Which is updated more often, Encyclopedia of Tanks or Sterile Processing Prep?

Encyclopedia of Tanks ships an update every 6 days, and Sterile Processing Prep every 2 months. Most recently, Encyclopedia of Tanks was updated on October 24, 2026 and Sterile Processing Prep 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.*