ZKBio Zlink vs Black Reader
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ZKBio Zlink
This cloud-based IoT platform integrates access control, time and attendance, and an approval center for small to medium-sized businesses. It enhances operational efficiency and connectivity, offering a scalable solution without significant upfront IT investment.
- Cloud-based IoT platform
- Integrated access control
- Time and attendance tracking
- Approval center
- Scalable AWS infrastructure
- Simplified operations
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ZKTeco has developed the ZKBio Zlink, which uses Minerva IoT platform. It improves operational efficiency and connectivity, to meet the growing demand for digital transformation and cloud solutions. As a cloud-based IoT platform, ZKBio Zlink is designed for small and medium-sized businesses (SMBs). ZKBio Zlink offers a comprehensive solution that enhances efficiency and simplifies operations by integrating access control, time and attendance, and an approval center into one unified platform. Furthermore, ZKBio Zlink is supported by a high-end, secure Amazon Web Services (AWS) cloud infrastructure and can be scaled up and down easily. It eliminates the need for substantial upfront IT investments, making it easy for SMBs to use. ZKBio Zlink saves your time and effort, a smart solutions make your workplace more productive. If you have any questions, please feel free to contact us. E-mail: service@zkteco.com
Black Reader
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Black Reader is a focused PDF reader for iPhone and iPad. Open PDFs from Files, iCloud Drive, AirDrop, or other apps, then read comfortably with pinch-to-zoom and your choice of dark, light, or sepia reading modes. Keep your place automatically with per-document reading progress. Bookmark important pages, add notes to a page or an entire book, and capture page snippets with notes for later reference. Black Reader includes: • PDF reading with pinch-to-zoom • Dark, light, and sepia reading modes • Brightness control while reading • Automatic last-page memory • Bookmarks and favorites • Page and whole-book notes • Searchable recent PDFs and notes • Saved PDF snippets with notes • File sharing and document removal • No account required Black Reader contains advertising. A one-time in-app purchase is available to remove ads permanently.
Screenshots
Verdict
The clearest difference is in-app purchases: ZKBio Zlink at none against Black Reader's 1. Black Reader's advantage is update cadence (every 3 days vs every 3 weeks). On price, ads, device support and iOS requirement 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. Black Reader sells 1 one-off in-app purchase. ZKBio Zlink asks for nothing beyond the download.
ZKBio Zlink ships an update every 3 weeks, Black Reader every 3 days. The most recent releases landed on October 16, 2026 and October 8, 2026 respectively.
| Parameter | ZKBio Zlink | Black Reader |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 3 weeks | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 207 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | ZKTeco Inc. | ZAKARIA ELAROUSSI |
In-app purchases
ZKBio Zlink
No in-app purchases
Black Reader
- Black Reader PRO$0.99









