Comparison

A4Calc vs Keyboard Extension

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

Head to head
About

A4Calc

Features
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A4 Small Format Interchangeable Core Calculator (sister app of A2Calc and A3Calc) ---Programmed by a Locksmith, for Locksmiths--- Automatically calculates the pinning chart for A4 SFIC. Built for 6 or 7 pin systems, however, less can be achieved by using a decimal to erase a chamber. Minimum of a control and master key are required to make a chart. Additional change key available for all devices; 2 change keys available for 16:9 screen devices. Randomize function will generate completely random charts each time it is triggered. "Lock/Unlock" toggle disables/enables all inputs and functions to prevent unwanted/lost changes. Control Finder is an added bonus by reverse engineering a core to determine the control key's bitting. This is perfect when needing to remove multiple cores in a building when the control key has been lost. There are two methods for achieving the control key: 1. using the master, control, and bottom pins, or 2. using only the top/driver pins. Up to 16 different projects can be saved at any one given time. All projects are encrypted and protected with a passcode when stored on your device. All projects can be exported via AirPrint and Email. Compatibility: iPhone / iPod touch on iOS 8.0 or later and iPad on iOS 12.0 or later. Found a bug? Something not working? Have a suggestion? Feel free to contact me via email: farren@phoxlocks.com

About

Keyboard Extension

Manage text snippets and images with a custom keyboard extension. Save time by quickly accessing and organizing your frequently used content across all applications. Features include encryption and FaceID/TouchID protection for sensitive data.

Highlights
  • Custom keyboard extension
  • Text and image snippet management
  • Tag-based organization
  • Encryption for sensitive data
  • FaceID/TouchID protection
  • Universal app compatibility
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Introducing SnipKey, the simple and modern solution for managing text snippets and images, complete with a sleek custom keyboard extension. SnipKey seamlessly integrates into your digital workflow, revolutionizing how you interact with content across all your apps—from personal reminders to sensitive work information. SnipKey is a Keyboard Extension. Why SnipKey Stands Out? - Simple & Modern Design Intuitive interface that's a joy to use Clean, minimalist aesthetics for distraction-free productivity - Effortless Management Easily create, store, and categorize snippets and images Custom tags for quick retrieval and organization - Smart Keyboard Extension Access snippets instantly in any app Seamlessly switch to SnipKey without leaving your current task - Advanced Filtering Find exactly what you need with tag-based filtering Categorize snippets by type (Personal, Work, Banking) or custom tags - Enhanced Security Protect sensitive data with robust encryption Secure snippets with FaceID or TouchID for privacy - Universal Compatibility Works flawlessly across your favorite apps Access snippets wherever you are, whenever you need them SnipKey isn't just a snippet manager—it's a comprehensive, modern solution designed to enhance your productivity and simplify your digital life. With its sleek interface and powerful features, SnipKey transforms how you handle information. Learn more at https://snipkey.jrtv.online Terms of Service: https://snipkey.jrtv.online/terms-conditions Privacy Policy: https://snipkey.jrtv.online/privacy-policy EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

A4Calc4 screens
Keyboard Extension4 screens

Verdict

The call

The clearest difference is price: Keyboard Extension at Free against A4Calc's $4.99. Keyboard Extension also leads on update cadence (monthly vs every 8 months). A4Calc's advantage is in-app purchases (none vs 6) and iOS requirement (12.0 vs 26.0). On 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

Keyboard Extension is free to download; A4Calc costs $4.99 up front. Keyboard Extension sells 6 one-off in-app purchases. A4Calc asks for nothing beyond the download.

UpkeepUpdate frequency

A4Calc ships an update every 8 months, Keyboard Extension monthly. The most recent releases landed on October 26, 2026 and October 28, 2026 respectively.

Scorecard4 real differences · 6 level
A4Calc versus Keyboard Extension: the parameters behind the verdict, then further details
ParameterA4CalcKeyboard Extension
Price$4.99Free — better
Rating—4.9 (31 ratings) — better
Positive reviews—91.7% of reviews
Number of ratings—31 — better
Update frequencyEvery 8 monthsMonthly — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPodiPhone, iPad
Requires iOS12.0 — better26.0
Further details — not scored
Size2 MB30 MB
Age rating4+4+
DeveloperFarren DomeniciJonathan Taveras

In-app purchases

None

A4Calc

No in-app purchases

6 purchases

Keyboard Extension

One-time6
  • Candy Tip$1.99
  • Juice Tip$4.99
  • Juice Tip$9.99
Show 3 more
  • Ramen Tip$14.99
  • Burget Tip$29.99
  • Caviar Tip$99.99

Questions

Is A4Calc free?
A4Calc costs $4.99, with no in-app purchases.
Is Keyboard Extension free?
Keyboard Extension is free to download, with in-app purchases available.
Do A4Calc or Keyboard Extension have ads?
Neither A4Calc nor Keyboard Extension shows ads.
Which is updated more often, A4Calc or Keyboard Extension?
A4Calc ships an update every 8 months, and Keyboard Extension monthly. Most recently, A4Calc was updated on October 26, 2026 and Keyboard Extension on October 28, 2026.

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