Comparison

Knife Steel Composition Chart vs PocketBook Reader

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Knife Steel Composition Chart

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
Read full description

Knife Steel Composition and name cross-reference database. Includes popular, high end and exotic alloys used in knife blades. Over 6500 alloy names, over 1000 compositions. Alloy names for 21 different international standards, proprietary names and their equivalents. Easy alloy composition comparison with bar graph in 3 modes: mass percentage, molar masses and atomic count per 1000 atoms. If you have suggestions for improvement, please contact me. Posting in the review that there's a room for improvement doesn't help me at all, I am not a designer, but a software engineer. Please report missing alloys, as in either post the alloy name, or contact me. Complaining in the review "I didn't find what I wanted" means very little. If you encounter any problems using the app, please contact me using email. Posting in the review you have a problem, won't give me enough information to fix it. Sorry, there will be no translations to any language. There is no team, I am just one person collecting steel data and coding the app on web and mobile platforms. I have neither time nor resources to keep constantly translating large database. Case CV has been the database for a long time. Search for Case does show in the results. Case isn't the steel maker though.

About

PocketBook Reader

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
Currently charting
Read full description

PocketBook Reader is a free app for reading all formats (books, magazines, textbooks, comic books, etc.) and listening to audiobooks! The application supports 26 book and audio formats, including mobi, epub, fb2, cbz, cbr. Read without ads and with total comfort! Choose any content - any format! • Support of 19 book formats, including the most popular - EPUB, FB2, MOBI, PDF, DJVU, DOCX, RTF, TXT, HTML; • Comic book formats CBR and CBZ; • Open books protected with Adobe DRM (PDF, EPUB); • PDF Reflow function (reflow text in PDF files). Listen to audiobooks! • You can listen to audiobooks and other audio files in MP3, M4B, and take notes in them; • Built-in TTS (Text-to-speech) engine for the voicing of the text files. Download and sync content easily! • Free PocketBook Cloud service for synchronizing all your books, including audiobooks, as well as reading positions, notes and bookmarks on all your devices; • Your files from Dropbox or Google Books services are easily connected to the app to create one consolidated library. You can even connect multiple accounts at the same time; • Support for OPDS catalogs - get access to network libraries; • ISBN scanner, for quick search of electronic versions of books by barcode; • Opportunity to borrow books and periodicals; • If you have a E Ink e-reader PocketBook, you can easily synchronize all your books and accounts just by scanning a QR code. Ready to switch from another app? No problem! Getting started with PocketBook Reader is easy! With an intuitive interface, the application provides you with unprecedented freedom – lots of options for settings and no restrictions. Choose, change, customize, and personalize! • Intuitive interface, easy navigation, and minimalistic design; • Opportunity to choose one of the seven interface color themes, reassign the buttons and display areas; • Two night-reading modes - for better reading comfort anytime; • Adjust the font style, font size, line spacing, and margin size; • Animation of turning pages; • Opportunity to crop margins – make the page look exactly the way you want. Get fast file access and easy search! • All files are quickly found and instantly opened, even with built-in audio and video fragments; • Your books will never be lost in the device’s memory - thanks to the smart search, scanning files on your tablet or smartphone is a matter of seconds. Any file or document can be found in a few clicks! • The app allows you to sort books, create collections, filter and mark files as you like. Your library - your rules; • Convenient managing of audio files - it is easy to sort and play your audiobooks. Make bookmarks, take notes, add comments! • You can quickly find all your notes and share them with friends via email or messengers; • Collect all your notes, bookmarks, and comments into separate files for even greater convenience. PocketBook Reader was created by avid readers for avid readers, and that’s why it’s probably the best e-book reader app.

Screenshots

Knife Steel Composition Chart4 screens
PocketBook Reader4 screens

Verdict

The call

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 (#181 vs unranked). On price, 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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard8 real differences · 3 level
Knife Steel Composition Chart versus PocketBook Reader: the parameters behind the verdict, then further details
ParameterKnife Steel Composition ChartPocketBook Reader
PriceFreeFree
Rating4.9 (554 ratings) — better4.5 (9.8K ratings)
Positive reviews94.3% of reviews — better54.5% of reviews
Number of ratings5549.8K — better
Update frequencyEvery 5 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
Best chart rank—#181 — better
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS9.0 — better13.0
Further details — not scored
Size4 MB106 MB
Age rating4+9+
DeveloperZviSoft LLCPocketbook International SA

Customer experience

Knife Steel Composition Chart

All ratings554 ratings
Positive99.1%
Neutral0.5%
Negative0.4%
Written reviews122 reviews
Positive94.3%
Neutral1.6%
Negative4.1%

PocketBook Reader

All ratings9,831 ratings
Positive87.4%
Neutral3.9%
Negative8.7%
Written reviews1,350 reviews
Positive54.5%
Neutral11.6%
Negative33.9%

Bugs and requests

Knife Steel Composition Chart

Not enough reviews yet to summarise bugs or requests.

PocketBook Reader

Reported bugs

4 issues
  • 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

5 requests
  • 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

In-app purchases

None

Knife Steel Composition Chart

No in-app purchases

41 purchases

PocketBook Reader

One-time41
  • eBook3 variants$0.99
  • eBook (class A)$0.99
  • eBook2 variants$1.99
Show 38 more
  • eBook (class B)$1.99
  • eBook$2.95
  • eBook2 variants$2.99
  • eBook (class C)$2.99
  • eBook3 variants$3.99
  • eBook: type 4.79$3.99
  • eBook: type 4.19$3.99
  • eBook (class D)$3.99
  • eBook (class Alt5)$4.99
  • eBook: type 5.39$4.99
  • eBook (class F)$4.99
  • eBook: type 5.89$4.99
  • eBook$4.99
  • eBook: type 5.09$4.99
  • eBook (class G)$5.99
  • eBook2 variants$5.99
  • eBook: type 7.09$5.99
  • eBook: type 7.19$5.99
  • eBook: type 8.29$6.99
  • eBook: type 7.59$6.99
  • eBook3 variants$7.99
  • eBook: type 8.89$7.99
  • eBook (class J)$8.99
  • eBook$8.99
  • eBook$9.90
  • eBook2 variants$9.99
  • eBook (class L)$10.99
  • eBook: type 13.9$11.90
  • eBook$11.99
  • eBook: type 12.99$11.99
  • eBook$12.99
  • eBook (class N)$12.99
  • eBook (class O)$13.99
  • eBook: type 17.9$14.90
  • eBook$14.99
  • eBook (class R)$16.99
  • eBook (class T)$18.99
  • eBook (class W)$21.99

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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