Encyclopedia of Tanks vs Sterile Processing Prep
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Encyclopedia of Tanks
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.
- Thousands of articles and pictures
- HD photos
- Simple organization and UI
- Offline availability
- Badge collection system
- Suitable for all ages
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Explore tanks, their design and their historical development. This is a historical and technical reference encyclopedia. Read 346 articles, search for a topic, and save discoveries to revisit. START WITH FIVE FREE ARTICLES New readers can choose any five different articles. Your chosen articles stay unlocked, and revisiting them never uses another choice. Existing readers keep previously granted access. MAKE DISCOVERIES YOUR OWN • Search article titles and full text • Follow links between related topics • Save articles and return to your reading position • Continue recent reading and track your progress • Explore connections through the timeline and graph • Find article sources and image credits inside the app CHOOSE YOUR ACCESS Own the full encyclopedia with a one-time purchase for complete offline reading. Or choose monthly or annual Premium for the full encyclopedia plus AI chat grounded in this subject's articles. Eligible new Premium subscribers receive a three-day introductory trial. Subscriptions renew automatically unless canceled through your App Store account. Current local prices and terms appear before purchase. Restore Purchases recovers eligible previous purchases. Earlier full-version ownership includes encyclopedia and offline access; Premium AI requires a subscription. Internet access is required for AI chat and purchases. AI answers may contain errors; consult the linked sources. Article text is derived from Wikipedia. Images come from appropriately licensed Wikimedia Commons and other open sources. Source links, licenses and credits are available in the app. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Historical and technical reference includes warfare and weapons. This app does not sell weapons.
Sterile Processing Prep
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.
- 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
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Sterile Processing Prep helps you confidently learn, review, and strengthen sterile processing knowledge — whether you're preparing for certification or reinforcing real-world SPD practice. Designed for clarity and results, this independent study app provides structured practice tools without distractions or paywalls. All content is available from the start. What’s Included: • Domain-based practice quizzes • Flashcards with detailed explanations • Timed and untimed quiz modes • Mock-style exam practice • Score tracking and progress review • Weakest-area study targeting • Offline access — study anytime Study Areas Include: • Decontamination & Cleaning • Inspection & Assembly • Packaging & Sterilization • Storage & Distribution • Quality Assurance • Infection Prevention • Professional Practice • Facility & Environmental Controls Built for technicians, students, and professionals working in sterile processing environments who want structured review, targeted practice, and stronger exam confidence. Disclaimer Sterile Processing Prep is an independent educational resource and is not affiliated with, endorsed by, or sponsored by any certification organization. All trademarks belong to their respective owners.
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Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Encyclopedia of Tanks | Sterile Processing Prep |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | 4.6 (13 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 13 — better | 1 |
| Update frequency | Every 6 days — better | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 26.1 |
| Further details — not scored | ||
| Size | 147 MB | 5 MB |
| Age rating | 17+ | 9+ |
| Developer | Good Spider, LLC | Tracy Gates |
Customer experience
Encyclopedia of Tanks
Sterile Processing Prep
In-app purchases
Encyclopedia of Tanks
- Full Version$2.99
Sterile Processing Prep
No in-app purchases
Questions
Is Encyclopedia of Tanks free?
Is Sterile Processing Prep free?
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