Comparison

ZKBio Zlink vs Black Reader

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

Head to head
About

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.

Highlights
  • Cloud-based IoT platform
  • Integrated access control
  • Time and attendance tracking
  • Approval center
  • Scalable AWS infrastructure
  • Simplified operations
Read full description

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

About

Black Reader

Features
Read full description

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

ZKBio Zlink4 screens
Black Reader4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Black Reader sells 1 one-off in-app purchase. ZKBio Zlink asks for nothing beyond the download.

UpkeepUpdate frequency

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.

Scorecard2 real differences · 7 level
ZKBio Zlink versus Black Reader: the parameters behind the verdict, then further details
ParameterZKBio ZlinkBlack Reader
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 3 weeksEvery 3 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.015.0
Further details — not scored
Size207 MB31 MB
Age rating4+4+
DeveloperZKTeco Inc.ZAKARIA ELAROUSSI

In-app purchases

None

ZKBio Zlink

No in-app purchases

1 purchases

Black Reader

One-time1
  • Black Reader PRO$0.99

Questions

Is ZKBio Zlink free?
ZKBio Zlink is free to download, with no in-app purchases.
Is Black Reader free?
Black Reader is free to download, with in-app purchases available.
Do ZKBio Zlink or Black Reader have ads?
Neither ZKBio Zlink nor Black Reader shows ads.
Which is updated more often, ZKBio Zlink or Black Reader?
ZKBio Zlink ships an update every 3 weeks, and Black Reader every 3 days. Most recently, ZKBio Zlink was updated on October 16, 2026 and Black Reader on October 8, 2026.

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