Comparison

Black Box vs Callnor

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

Head to head
About

Black Box

Secure your phone by locking and restricting access to sensitive applications. Protect your private data with advanced password protection and prevent unauthorized app usage or in-app purchases. Enjoy comprehensive digital privacy with an easy-to-use interface.

Highlights
  • App locking with password protection
  • App disappearance for hidden access
  • App usage restrictions
  • Secure privacy with advanced passwords
  • Payment locking for in-app purchases
  • Intuitive interface
Features
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Black Box: Easily lock and restrict apps, protect your private data with one click. Secure your phone with a password. 100% safe and private! Don't want others to see your privacy? Use our lock and restrict features to keep your apps and data hidden from others. Try this most secure app lock and give your phone 100% privacy protection. 【Key Features】 App Locking: Set password protection for sensitive apps like social media, photo galleries, etc., protecting your privacy anytime, anywhere. App Disappearance: No one but you can find your apps unless you actively reveal them. App Restrictions: Limit app installation, deletion, in-app purchases, control app visibility everywhere, and lock app usage. Secure Privacy: The app lock features advanced security passwords, helping you lock apps and prevent others from casually viewing in-app data. Payment Locking: Lock App Store in-app purchases to avoid accidental payments or prevent your children from buying games. 【Why Choose Black Box?】 100% Safe and Reliable: Uses advanced encryption technology Easy to Use: Intuitive interface design, effortless to get started Comprehensive Protection: Guards your privacy from apps to files Continuous Updates: We constantly improve features to provide you with the best experience Download Black Box now and enjoy true digital privacy! Your encouragement drives our progress! Stay tuned for more powerful features coming soon. If you encounter any issues or have suggestions while using the app, please feel free to provide feedback within the app. blackbox@whohub.cn Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://blackbox.whohub.cn/policy/privacy Use the most reliable app lock to protect your privacy, easily safeguard your digital privacy. Use the app lock to lock apps or protect apps from being discovered, ensuring your security.

About

Callnor

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Callnor is Linknor’s calling feature—now available as a standalone app. Previously, calling was built directly into Linknor. Callnor replaces this functionality with a dedicated app designed specifically for fast, seamless phone calls. The result: faster launch times, more direct operation, and an interface focused entirely on calling—without having to navigate through Linknor. DIRECTLY CONNECTED TO LINKNOR Callnor uses your contacts live from Linknor. Changes to names or favorites are available immediately, with no manual synchronization required. PRIVACY BY DESIGN Callnor intentionally stores only the minimum amount of data. Phone numbers remain exclusively in your iPhone’s Contacts app. Names and favorites are retrieved directly from Linknor. A Linknor contact in Callnor is simply a reference to the corresponding entry in your address book. Contact information is neither duplicated nor permanently stored in Callnor. This keeps the app lightweight while ensuring your contact data stays exactly where you expect it. WHAT IS SENT TO LINKNOR After every call, Callnor sends the following information to Linknor: • Which contact was called • When the call started and ended • How long the call lasted • Whether the call was successfully connected Opening a contact is also recorded as a separate event. Phone numbers are used only briefly to match the call to a contact and are not permanently stored by Linknor. WHAT LINKNOR DOES WITH THIS INFORMATION Linknor automatically adds every event to the contact history of the corresponding profile. Calls appear in the communication history with their status and duration—just like calls logged directly in Linknor. The “Last Contacted” date is also updated automatically. This keeps your complete communication history in one place, even when calls are made through Callnor. FEATURES • Clear dashboard showing today’s calls, connection rate, and weekly activity • Alphabetically sorted and searchable contact list with quick navigation and favorites • Classic dial pad for numbers not stored in your contacts • Call history showing the status and duration of every call WHY A SEPARATE APP? A calling app needs to respond instantly when a call starts or ends. As a standalone app, Callnor is optimized specifically for this purpose—without having to load the rest of Linknor’s functionality at the same time.

Screenshots

Black Box4 screens
Callnor3 screens

Verdict

The call

Black Box and Callnor are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Black Box ships an update every 3 days, Callnor every 4 days. Both last shipped on October 24, 2026.

ScorecardNo meaningful differences
Black Box versus Callnor: the parameters behind the verdict, then further details
ParameterBlack BoxCallnor
PriceFreeFree
Rating4.7 (41 ratings) — better—
Positive reviews66.7% of reviews—
Number of ratings41 — better—
Update frequencyEvery 3 days — betterEvery 4 days
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhoneiPhone, iPad — better
Requires iOS16.0 — better17.0
Further details — not scored
Size68 MB4 MB
Age rating4+4+
Developer俊涛 刘Michael Schoenbeck

In-app purchases

None

Black Box

No in-app purchases

None

Callnor

No in-app purchases

Questions

Is Black Box free?
Black Box is free to download, with no in-app purchases.
Is Callnor free?
Callnor is free to download, with no in-app purchases.
Do Black Box or Callnor have ads?
Neither Black Box nor Callnor shows ads.
Which is updated more often, Black Box or Callnor?
Black Box ships an update every 3 days, and Callnor every 4 days. Most recently, Black Box was updated on October 24, 2026 and Callnor on October 24, 2026.

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