Comparison

Knife Steel Composition Chart vs BookPlayer

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

BookPlayer

This app provides a dedicated listening experience for audiobooks in M4B, M4A, MP3, and FLAC formats. It offers robust import, management, and playback features, including chapter navigation, variable playback speed, and cloud sync for seamless listening across devices.

Highlights
  • Import audiobooks via AirDrop, Files, iTunes, servers, and zip files
  • Manage library with progress tracking, sorting, and playlists
  • Advanced playback controls including speed, rewind, and volume boost
  • Chapter navigation and lock screen controls
  • Cloud sync for cross-device listening
  • CarPlay and Apple Watch companion app support
Features
Read full description

A wonderful player for your M4B/M4A/MP3/FLAC based audiobooks. Import – Using AirDrop from your Mac or iOS device – From Files and other apps on your device – Via File Sharing in iTunes on your Mac or PC – From your own AudibookShelf or Jellyfin server – Zip files with your folders and books Manage – Maintain and see progress of your books – Mark books as finished – Drag & Drop to sort your library – Create playlists – Automatically play items in turn – Play the first unfinished file by tapping on the playlist artwork – Move files to playlists from the library or import them directly – Edit your book details (title, author, artwork) – Connect to your Hardcover.app account, and track your library progress Listen – Control audio playback from the lock screen, control center or from the companion app on the Apple Watch – Play and navigate books with Chapters – Jump to start of the current book – Change playback speed – Smart rewind – Volume Boost – Support for remote events from headset buttons and the lock screen – Sleep timer with adjustable duration – CarPlay support – VoiceOver support – Dolby Atmos support – Dark mode for night owls – Continue listening across your devices with Cloud Sync, including stand alone playback on your Apple Watch Supported M4B/M4A/MP3 BookPlayer is licensed under GNU General Public License v3.0. The source code and a list of all its contributors can be found on the GitHub page of this project at www.github.com/TortugaPower/BookPlayer You can see our Privacy policy and terms of use in the following links: – https://github.com/TortugaPower/BookPlayer/blob/main/PRIVACY_POLICY.md – https://github.com/TortugaPower/BookPlayer/blob/main/TERMS_CONDITIONS.md For help and ways to contribute to the project see the support section in the Settings screen of BookPlayer or visit www.bookplayer.app If you enjoy BookPlayer, we would be glad if you consider writing a review.

Screenshots

Knife Steel Composition Chart4 screens
BookPlayer4 screens

Verdict

The call

The clearest difference is in-app purchases: Knife Steel Composition Chart at none against BookPlayer's 15. Knife Steel Composition Chart also leads on review sentiment (94% vs 83%) and iOS requirement (9.0 vs 26.0). BookPlayer's advantage is update cadence (every 9 days vs every 5 months) and ratings volume (20K vs 584). On price, rating, 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. BookPlayer sells 11 in-app purchases, starting at $1.99 per month. Knife Steel Composition Chart asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for Knife Steel Composition Chart against 4.8 for BookPlayer. That said, the two scores are not equally well evidenced: BookPlayer has 20K ratings behind it against 584, so its average is the more settled of the two. Written reviews are what separate them: 94% of Knife Steel Composition Chart's written reviews are positive against 83% of BookPlayer's.

UpkeepUpdate frequency

Knife Steel Composition Chart ships an update every 5 months, BookPlayer every 9 days. The most recent releases landed on October 23, 2026 and October 28, 2026 respectively.

Scorecard7 real differences · 4 level
Knife Steel Composition Chart versus BookPlayer: the parameters behind the verdict, then further details
ParameterKnife Steel Composition ChartBookPlayer
PriceFreeFree
Rating4.9 (584 ratings) — better4.8 (20K ratings)
Positive reviews94.3% of reviews — better82.6% of reviews
Number of ratings58420K — better
Update frequencyEvery 5 monthsEvery 9 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
Best chart rank—#55 — better
DevicesiPhone, iPodiPhone, iPad, Apple Watch — better
Requires iOS9.0 — better26.0
Further details — not scored
Size4 MB81 MB
Age rating4+4+
DeveloperZviSoft LLCGianni Carlo

Customer experience

Knife Steel Composition Chart

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

BookPlayer

All ratings19,792 ratings
Positive96.7%
Neutral1.3%
Negative1.9%
Written reviews1,311 reviews
Positive82.6%
Neutral4.9%
Negative12.5%

Bugs and requests

Knife Steel Composition Chart

Not enough reviews yet to summarise bugs or requests.

BookPlayer

Reported bugs

3 issues
  • Playback issues with certain audio formats
  • Importing problems with large audiobook libraries
  • Crashes when deleting books

Requested features

6 requests
  • Bookmark management
  • Percentage completion tracking
  • Improved multi-file book handling
  • Customizable sleep timer
  • iCloud/cloud sync between devices
Show 1 more
  • Siri/Shortcuts integration

In-app purchases

None

Knife Steel Composition Chart

No in-app purchases

11 purchases

BookPlayer

Subscriptions7
  • Support Monthly (1 Month)$1.991 Month
  • Support Monthly (1 Month)$2.991 Month
  • Support Monthly (1 Month)$3.991 Month
Show 4 more
  • Pro Monthly (1 Month)$4.991 Month
  • Support Monthly (1 Month)$6.991 Month
  • Support Monthly (1 Month)$9.991 Month
  • Pro Yearly (1 Year)$49.991 Year
One-time4
  • Kind tip$2.99
  • Kind Tip$2.99
  • Excellent Tip2 variants$4.99
Show 1 more
  • Incredible Tip2 variants$9.99

Questions

Is Knife Steel Composition Chart free?
Knife Steel Composition Chart is free to download, with no in-app purchases.
Is BookPlayer free?
BookPlayer is free to download, with in-app purchases available.
Which has better reviews, Knife Steel Composition Chart or BookPlayer?
Knife Steel Composition Chart is rated higher. Knife Steel Composition Chart averages 4.9 out of 5 from 584 ratings, while BookPlayer averages 4.8 from 20K ratings.
Do Knife Steel Composition Chart or BookPlayer have ads?
Neither Knife Steel Composition Chart nor BookPlayer shows ads.
Which is updated more often, Knife Steel Composition Chart or BookPlayer?
Knife Steel Composition Chart ships an update every 5 months, and BookPlayer every 9 days. Most recently, Knife Steel Composition Chart was updated on October 23, 2026 and BookPlayer on October 28, 2026.

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