# AB Quantum vs Shadow Book

The clearest difference is price: AB Quantum at Free against Shadow Book's $14.99. AB Quantum also leads on rating (4.7 vs 3.3) and update cadence (fortnightly vs every 15 months). Shadow Book's advantage is in-app purchases (none vs 15). On ads, chart position, device support and iOS requirement there is nothing between them.

AB Quantum is free to download; Shadow Book costs $14.99 up front. AB Quantum sells 15 in-app purchases, starting at $2.99 per month. Shadow Book asks for nothing beyond the download.

AB Quantum holds the better App Store score, 4.7 against 3.3. That said, the two scores are not equally well evidenced: AB Quantum has 2.7K ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 45% of AB Quantum's written reviews are positive against 33% of Shadow Book's.

AB Quantum ships an update fortnightly, Shadow Book every 15 months. The most recent releases landed on September 29, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | AB Quantum | Shadow Book |
| --- | --- | --- |
| Price | **Free** | $14.99 |
| Rating | **[4.7 (2.7K ratings)](https://appshunter.io/ios/app/ab-quantum/id785619104/reviews)** | [3.3 (6 ratings)](https://appshunter.io/ios/app/shadow-book/id1482820623/reviews) |
| Number of ratings | **2.7K** | 6 |
| Positive reviews | **44.7% of reviews** | 33.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 15 months |
| Monetization | **Free with in-app purchases** | Paid |
| Best chart rank | **#114** | #195 |
| Size | 299 MB | 26 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Applied Ballistics](https://appshunter.io/developer/785619107) | [Shadow Hog Tactical and Consulting](https://appshunter.io/developer/1482820622) |

## What reviewers say

### AB Quantum

[App page](https://appshunter.io/ios/app/ab-quantum/id785619104)

**Currently charting:** #114 Top Grossing · Sports (US App Store)

This app provides a comprehensive ballistics solver and profile management tool for long-range shooting. It features a new user interface designed for single-handed use, enabling quick solutions and seamless integration with Bluetooth-enabled devices. Users can sync gun profiles, create customizable range cards, and access an updated reticle library.

**Highlights:** Ballistics solver, Profile management, Bluetooth device integration, Customizable range/target cards, Reticle library, Ballistic truing, Chronograph integration

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

**In-app purchases (15)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Elite Monthly | $2.99 | per month |
| Professional Monthly | $3.99 | per month |
| Elite Annual | $19.99 | per year |
| Professional Annual | $29.99 | per year |
| Custom Drag Model (CDM) for Berger 0.264cal 140gr Target Hybrid | $1.99 | one-time |
| Custom Drag Model (CDM) for Sierra 0.308cal 175gr MatchKing | $1.99 | one-time |
| Custom Drag Model (CDM) for Hornady 0.264cal 140gr ELD Match | $1.99 | one-time |
| Custom Drag Model (CDM) for Hornady 0.264cal 143gr ELD X | $1.99 | one-time |
| Custom Drag Model (CDM) for Hornady 0.264cal 147gr ELD Match | $1.99 | one-time |
| AB Caliber 0.224 CDMs | $9.99 | one-time |
| AB Caliber 0.243 CDMs | $9.99 | one-time |
| AB Caliber 0.264 CDMs | $9.99 | one-time |
| AB Caliber 0.284 CDMs | $9.99 | one-time |
| AB Caliber 0.308 CDMs | $9.99 | one-time |
| AB Caliber 0.338 CDMs | $9.99 | one-time |

**What reviewers like**

- 🚀 Best ballistic app
- 👍 Accurate ballistic calculations
- 👍 Comprehensive features
- 👍 Great support
- 👍 Easy to use once set up

**What reviewers complain about**

- 🐛 Buggy after updates
- 🐛 Connectivity issues with Kestrel
- 🐛 Glitches with user interface
- 👎 Difficult to navigate
- 👎 Outdated interface

**Reported bugs**

- Bullet BC not retaining custom values
- Profiles disappearing after updates
- Atmospheric data not syncing correctly
- Ballistics calculations not matching real-world data

**Requested features**

- Apple Watch app
- More reticle options
- Metric unit support
- Backup and restore functionality
- Improved range card and target card features


### Shadow Book

[App page](https://appshunter.io/ios/app/shadow-book/id1482820623)

**Currently charting:** #195 Top Paid · Sports (US App Store)

This digital data book helps responsible shooters track and maintain valuable information for various firearm types. It's designed for both professionals and sportsmen, offering essential features and more for managing round counts, maintenance, and range sessions.

**Highlights:** Track round count, Log maintenance history, Record range sessions, Supports rifles, shotguns, pistols, bows, Digital data book for shooters

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

**In-app purchases:** none


## Frequently asked questions

### Is AB Quantum free?

AB Quantum is free to download, with in-app purchases available.

### Is Shadow Book free?

Shadow Book costs $14.99, with no in-app purchases.

### Which has better reviews, AB Quantum or Shadow Book?

AB Quantum is rated higher. AB Quantum averages 4.7 out of 5 from 2.7K ratings, while Shadow Book averages 3.3 from 6 ratings.

### Do AB Quantum or Shadow Book have ads?

Neither AB Quantum nor Shadow Book shows ads.

### Which is updated more often, AB Quantum or Shadow Book?

AB Quantum ships an update fortnightly, and Shadow Book every 15 months. Most recently, AB Quantum was updated on September 29, 2026 and Shadow Book on September 6, 2026.

### Which is more popular, AB Quantum or Shadow Book?

AB Quantum currently peaks at #114 in the App Store charts, and Shadow Book at #195. Chart position reflects recent download velocity rather than total install base.

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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.*