Knife Steel Composition Chart vs BookPlayer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Extensive alloy name database
- Detailed composition data
- Cross-reference international standards
- Proprietary name equivalents
- Bar graph composition comparison
- Multiple comparison modes
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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.
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.
- 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
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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
Verdict
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
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.
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.
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.
| Parameter | Knife Steel Composition Chart | BookPlayer |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (584 ratings) — better | 4.8 (20K ratings) |
| Positive reviews | 94.3% of reviews — better | 82.6% of reviews |
| Number of ratings | 584 | 20K — better |
| Update frequency | Every 5 months | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Best chart rank | — | #55 — better |
| Devices | iPhone, iPod | iPhone, iPad, Apple Watch — better |
| Requires iOS | 9.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 4 MB | 81 MB |
| Age rating | 4+ | 4+ |
| Developer | ZviSoft LLC | Gianni Carlo |
Customer experience
Knife Steel Composition Chart
BookPlayer
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
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- Siri/Shortcuts integration
In-app purchases
Knife Steel Composition Chart
No in-app purchases
BookPlayer
- Support Monthly (1 Month)$1.991 Month
- Support Monthly (1 Month)$2.991 Month
- Support Monthly (1 Month)$3.991 Month
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- 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
- Kind tip$2.99
- Kind Tip$2.99
- Excellent Tip2 variants$4.99
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- Incredible Tip2 variants$9.99
Questions
Is Knife Steel Composition Chart free?
Is BookPlayer free?
Which has better reviews, Knife Steel Composition Chart or BookPlayer?
Do Knife Steel Composition Chart or BookPlayer have ads?
Which is updated more often, Knife Steel Composition Chart or BookPlayer?
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