Comparison

A3Calc vs JMA America

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

Head to head
About

A3Calc

Features
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A3 Small Format Interchangeable Core Calculator (sister app of A2Calc and A4Calc) ---Programmed by a Locksmith, for Locksmiths--- Automatically calculates the pinning chart for A3 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

JMA America

Easily find locksmiths in your area and identify the keys you need. Access a catalog of competitor key codes and download it for offline use. Connect with locksmiths via phone or email.

Highlights
  • Locksmith locator
  • Key code reference list
  • Offline key catalog download
  • Contact locksmiths by phone/email
Features
Read full description

Now it's faster and easier than ever to find a locksmith and identify the key you need. JMA offers, among others, the following functions: * A list of references with the codes of the different competitors that exist in the market. * Find locksmiths in the area where you are so you can contact us by phone or email. * The keys catalog could be downloaded to the phone, to work offline.

Screenshots

A3Calc4 screens
JMA America4 screens

Verdict

The call

The clearest difference is price: JMA America at Free against A3Calc's $1.99. JMA America also leads on update cadence (every 9 days vs every 18 months). A3Calc's advantage is iOS requirement (12.0 vs 26.5). On ads, in-app purchases 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

JMA America is free to download; A3Calc costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

A3Calc ships an update every 18 months, JMA America every 9 days. The most recent releases landed on November 8, 2026 and November 3, 2026 respectively.

Scorecard3 real differences · 7 level
A3Calc versus JMA America: the parameters behind the verdict, then further details
ParameterA3CalcJMA America
Price$1.99Free — better
Rating—1.0 (1 ratings) — better
Positive reviews—0.0% of reviews
Number of ratings—1 — better
Update frequencyEvery 18 monthsEvery 9 days — better
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPodiPhone, iPad
Requires iOS12.0 — better26.5
Further details — not scored
Size2 MB12 MB
Age rating4+4+
DeveloperFarren DomeniciEduardo Romero

In-app purchases

None

A3Calc

No in-app purchases

None

JMA America

No in-app purchases

Questions

Is A3Calc free?
A3Calc costs $1.99, with no in-app purchases.
Is JMA America free?
JMA America is free to download, with no in-app purchases.
Do A3Calc or JMA America have ads?
Neither A3Calc nor JMA America shows ads.
Which is updated more often, A3Calc or JMA America?
A3Calc ships an update every 18 months, and JMA America every 9 days. Most recently, A3Calc was updated on November 8, 2026 and JMA America on November 3, 2026.

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