# ASTB Prep vs Joint Compass

The clearest difference is price: ASTB Prep at Free against Joint Compass's $1.49. ASTB Prep also leads on update cadence (every 2 weeks vs every 4 months). Joint Compass's advantage is in-app purchases (none vs 2) and iOS requirement (15.0 vs 17.0). On ads and device support there is nothing between them.

ASTB Prep is free to download; Joint Compass costs $1.49 up front. ASTB Prep sells 2 one-off in-app purchases. Joint Compass asks for nothing beyond the download.

ASTB Prep ships an update every 2 weeks, Joint Compass every 4 months. The most recent releases landed on October 15, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | ASTB Prep | Joint Compass |
| --- | --- | --- |
| Price | **Free** | $1.49 |
| Rating | **[4.9 (438 ratings)](https://appshunter.io/ios/app/astb-prep/id1549216388/reviews)** | — |
| Number of ratings | **438** | — |
| Positive reviews | 93.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 4 months |
| Monetization | Free with in-app purchases | — |
| Size | 812 MB | 559 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad, Mac | **iPhone, iPad, iPod, Mac** |
| Age rating | 9+ | 12+ |
| Developer | [Alex Hastings](https://appshunter.io/developer/1549216390) | [Steady Flow](https://appshunter.io/developer/1550297149) |

## What reviewers say

### ASTB Prep

[App page](https://appshunter.io/ios/app/astb-prep/id1549216388)

Prepare for naval aviation exams with comprehensive study materials, practice tests, and simulators. Covers all subtests for Navy, Marine Corps, and Coast Guard aviation selection. Features adaptive testing and offline access.

**Highlights:** 73 comprehensive lessons, 140+ flashcard decks, 600+ sample test questions, Unlimited adaptive practice tests, UAV tracking simulator, Terrain identification simulator, Stick and throttle simulators

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Joystick Functionality | Free | one-time |
| Full Access | $39.99 | one-time |

**What reviewers like**

- 🚀 Great tool for ASTB prep
- 👍 Comprehensive study materials
- 🚀 Helpful simulators for PBM
- 🚀 Improved test scores
- 👍 Detailed lessons and practice tests

**What reviewers complain about**

- 🐛 Some math/physics questions have incorrect answers
- 🐛 UAV simulator not fully accurate to real test
- 🐛 Stick and throttle simulator needs improvement

**Reported bugs**

- Mechanical comprehension test has 30 questions, not 20
- Terrain identification section has occasional screen color issues

**Requested features**

- Option to disable timer for terrain identification
- Ability to configure duration of correct answer display
- Add audio for UAV portion to simulate real test experience
- Include emergency scenario training for UAV


### Joint Compass

[App page](https://appshunter.io/ios/app/joint-compass/id6757522121)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is ASTB Prep free?

ASTB Prep is free to download, with in-app purchases available.

### Is Joint Compass free?

Joint Compass costs $1.49, with no in-app purchases.

### Do ASTB Prep or Joint Compass have ads?

Neither ASTB Prep nor Joint Compass shows ads.

### Which is updated more often, ASTB Prep or Joint Compass?

ASTB Prep ships an update every 2 weeks, and Joint Compass every 4 months. Most recently, ASTB Prep was updated on October 15, 2026 and Joint Compass on October 8, 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.*