Comparison

ServiceCalc 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

ServiceCalc

This tool automates invoice calculations for service technicians, reducing errors and time spent. It handles labor, parts, tax, and totals, with features like a built-in timer and flashlight.

Highlights
  • Automated labor calculation
  • Parts/materials totaling
  • Configurable tax rates
  • Built-in timer
  • Flashlight function
  • Customizable skins
Features
Read full description

***FEATURED IN KEYNOTES MAGAZINE*** ServiceCalc cuts time spent and reduces errors when totaling invoices out in the field. This tool automates and displays the Labor, Parts/Materials, Tax, and Total. ServiceCalc is ideal for Locksmiths, Electricians, Plumbers, or any other service technicians that frequently write up invoices. Conventional Method: -Sub total line items on invoice -Add up labor on a standard calculator -Write down labor on invoice -Clear the calculator's screen -Add up parts/materials -Write down on invoice -Multiply tax rate -Write down on invoice -Clear calculator's screen -Add labor, parts, and tax -Write total on invoice ServiceCalc Method: -Sub total line items on invoice -Add up labor and tap Labor button -Add up parts and tap Parts button*** -Write down totals on invoice ***Parts are added per line. The timer is used to create a delay when making a single multiplication. This delay gives you enough time to read its subtotal to then transfer onto the invoice.*** After tapping Parts you can turn your iDevice sideways (landscape) for a larger readout. Quickly add the desired labor by tapping the half hour or full hour buttons. Two tax rates are configurable to allow multiple jurisdictions. The secondary tax rate can also be used as a tip calculator. Built in flashlight function for illuminating your invoice. 3 Skins to choose from: Original, Blue Steel, and Magnum ---------------------------------- Totals truncate to 2 decimal places. Tax is rounded up to the hundredths when the halfway point is a value of 5 or higher. Example: if tax = 2.775, actual tax = 2.78 if tax = 2.77445, actual tax = 2.78 if tax = 2.771, actual tax = 2.77 ---------------------------------- 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
  • Find local locksmiths
  • Identify key codes
  • Competitor key 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

ServiceCalc4 screens
JMA America4 screens

Verdict

The call

The clearest difference is review sentiment: ServiceCalc at 91% against JMA America's 0%. ServiceCalc also leads on rating (4.0 vs 1.0) and ratings volume (4 vs 1). JMA America's advantage is price (Free vs $0.99) and update cadence (every 9 days vs every 2 months). 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; ServiceCalc costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

ServiceCalc holds the better App Store score, 4.0 against 1.0. Both are backed by a comparable volume of ratings — 4 and 1 respectively. Written reviews point the same way: 91% of ServiceCalc's written reviews are positive against 0% of JMA America's.

UpkeepUpdate frequency

ServiceCalc ships an update every 2 months, JMA America every 9 days. The most recent releases landed on October 10, 2026 and October 19, 2026 respectively.

Scorecard7 real differences · 3 level
ServiceCalc versus JMA America: the parameters behind the verdict, then further details
ParameterServiceCalcJMA America
Price$0.99Free — better
Rating4.0 (4 ratings) — better1.0 (1 ratings)
Positive reviews90.9% of reviews — better0.0% of reviews
Number of ratings4 — better1
Update frequencyEvery 2 monthsEvery 9 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPodiPhone, iPad
Requires iOS12.0 — better26.5
Further details — not scored
Size1 MB10 MB
Age rating4+4+
DeveloperFarren DomeniciEduardo Romero

Customer experience

ServiceCalc

All ratings4 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews11 reviews
Positive90.9%
Neutral9.1%
Negative0.0%

JMA America

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

ServiceCalc

No in-app purchases

None

JMA America

No in-app purchases

Questions

Is ServiceCalc free?
ServiceCalc costs $0.99, with no in-app purchases.
Is JMA America free?
JMA America is free to download, with no in-app purchases.
Which has better reviews, ServiceCalc or JMA America?
ServiceCalc is rated higher. ServiceCalc averages 4.0 out of 5 from 4 ratings, while JMA America averages 1.0 from 1 ratings.
Do ServiceCalc or JMA America have ads?
Neither ServiceCalc nor JMA America shows ads.
Which is updated more often, ServiceCalc or JMA America?
ServiceCalc ships an update every 2 months, and JMA America every 9 days. Most recently, ServiceCalc was updated on October 10, 2026 and JMA America on October 19, 2026.

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