# Knife Steel Composition Chart vs PocketBook Reader

The clearest difference is review sentiment: Knife Steel Composition Chart at 94% against PocketBook Reader's 55%. Knife Steel Composition Chart also leads on in-app purchases (none vs 56) and rating (4.9 vs 4.5). PocketBook Reader's advantage is ratings volume (9.8K vs 554) and chart position (#183 vs unranked). On price, ads and device support there is nothing between them.

Both are free to download. PocketBook Reader sells 41 one-off in-app purchases. Knife Steel Composition Chart asks for nothing beyond the download.

Knife Steel Composition Chart holds the better App Store score, 4.9 against 4.5. That said, the two scores are not equally well evidenced: PocketBook Reader has 9.8K ratings behind it against 554, so its average is the more settled of the two. Written reviews point the same way: 94% of Knife Steel Composition Chart's written reviews are positive against 55% of PocketBook Reader's.

Knife Steel Composition Chart ships an update every 5 months, PocketBook Reader every 2 months. The most recent releases landed on October 13, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Knife Steel Composition Chart | PocketBook Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (554 ratings)](https://appshunter.io/ios/app/knife-steel-composition-chart/id498892262/reviews)** | [4.5 (9.8K ratings)](https://appshunter.io/ios/app/pocketbook-reader/id805488884/reviews) |
| Number of ratings | 554 | **9.8K** |
| Positive reviews | **94.3% of reviews** | 54.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | — | **#183** |
| Size | 4 MB | 106 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 9+ |
| Developer | [ZviSoft LLC](https://appshunter.io/developer/498892265) | [Pocketbook International SA](https://appshunter.io/developer/1536135171) |

## What reviewers say

### Knife Steel Composition Chart

[App page](https://appshunter.io/ios/app/knife-steel-composition-chart/id498892262)

Access a comprehensive database of knife steel alloys, featuring over 6500 names and 1000 compositions. Compare alloys easily with visual bar graphs based on mass percentage, molar masses, or atomic counts. Report missing alloys or suggest improvements directly to the developer.

**Highlights:** Extensive alloy name database, Detailed composition data, Cross-reference international standards, Proprietary name equivalents, Bar graph composition comparison, Multiple comparison modes

**Features:** macOS Compatibility

**In-app purchases:** none


### PocketBook Reader

[App page](https://appshunter.io/ios/app/pocketbook-reader/id805488884)

**Currently charting:** #183 Top Free · Book (US App Store)

This app is a versatile reader supporting 26 book and audio formats, including EPUB, PDF, and audiobooks. It offers features like PDF reflow, text-to-speech, cloud synchronization, and extensive customization options for a comfortable reading experience.

**Highlights:** Supports 26 book and audio formats, PDF Reflow function, Text-to-speech engine, Cloud synchronization service, Customizable interface and reading settings, Adobe DRM support

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

**In-app purchases (41)**

| Purchase | Price | Billing |
| --- | --- | --- |
| eBook | $0.99 | one-time |
| eBook (class A) | $0.99 | one-time |
| eBook | $1.99 | one-time |
| eBook (class B) | $1.99 | one-time |
| eBook | $2.95 | one-time |
| eBook | $2.99 | one-time |
| eBook (class C) | $2.99 | one-time |
| eBook | $3.99 | one-time |
| eBook: type 4.79 | $3.99 | one-time |
| eBook: type 4.19 | $3.99 | one-time |
| eBook (class D) | $3.99 | one-time |
| eBook (class Alt5) | $4.99 | one-time |
| eBook: type 5.39 | $4.99 | one-time |
| eBook (class F) | $4.99 | one-time |
| eBook: type 5.89 | $4.99 | one-time |
| eBook | $4.99 | one-time |
| eBook: type 5.09 | $4.99 | one-time |
| eBook (class G) | $5.99 | one-time |
| eBook | $5.99 | one-time |
| eBook: type 7.09 | $5.99 | one-time |
| eBook: type 7.19 | $5.99 | one-time |
| eBook: type 8.29 | $6.99 | one-time |
| eBook: type 7.59 | $6.99 | one-time |
| eBook | $7.99 | one-time |
| eBook: type 8.89 | $7.99 | one-time |
| eBook (class J) | $8.99 | one-time |
| eBook | $8.99 | one-time |
| eBook | $9.90 | one-time |
| eBook | $9.99 | one-time |
| eBook (class L) | $10.99 | one-time |
| eBook: type 13.9 | $11.90 | one-time |
| eBook | $11.99 | one-time |
| eBook: type 12.99 | $11.99 | one-time |
| eBook | $12.99 | one-time |
| eBook (class N) | $12.99 | one-time |
| eBook (class O) | $13.99 | one-time |
| eBook: type 17.9 | $14.90 | one-time |
| eBook | $14.99 | one-time |
| eBook (class R) | $16.99 | one-time |
| eBook (class T) | $18.99 | one-time |
| eBook (class W) | $21.99 | one-time |

**What reviewers like**

- 👍 Convenient reading experience
- 🚀 Smooth scrolling
- 💡 Customizable settings (font, margin, etc.)
- 🔒 Supports DRM-protected content
- 👍 Intuitive user interface

**What reviewers complain about**

- 🐛 Crashes and freezes
- 🐛 Unreliable cloud sync
- 🐛 Inconsistent page rendering
- 🐛 Buggy text highlighting and annotation
- 🐛 Slow loading times

**Reported bugs**

- Books disappearing from library after login issues
- Inability to open DRM-protected PDFs
- Inconsistent behavior when switching between portrait and landscape modes
- Text-to-speech voice quality issues

**Requested features**

- Ability to organize books into custom folders
- Option to disable quick action zones
- Improved text-to-speech controls (seek, pause, etc.)
- Support for handwritten annotations with Apple Pencil
- Faster page turning and scrolling


## Frequently asked questions

### Is Knife Steel Composition Chart free?

Knife Steel Composition Chart is free to download, with no in-app purchases.

### Is PocketBook Reader free?

PocketBook Reader is free to download, with in-app purchases available.

### Which has better reviews, Knife Steel Composition Chart or PocketBook Reader?

Knife Steel Composition Chart is rated higher. Knife Steel Composition Chart averages 4.9 out of 5 from 554 ratings, while PocketBook Reader averages 4.5 from 9.8K ratings.

### Do Knife Steel Composition Chart or PocketBook Reader have ads?

Neither Knife Steel Composition Chart nor PocketBook Reader shows ads.

### Which is updated more often, Knife Steel Composition Chart or PocketBook Reader?

Knife Steel Composition Chart ships an update every 5 months, and PocketBook Reader every 2 months. Most recently, Knife Steel Composition Chart was updated on October 13, 2026 and PocketBook Reader on October 19, 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.*