ServiceCalc vs JMA America
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Automated labor calculation
- Parts/materials totaling
- Configurable tax rates
- Built-in timer
- Flashlight function
- Customizable skins
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***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
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.
- Find local locksmiths
- Identify key codes
- Competitor key reference list
- Offline key catalog download
- Contact locksmiths by phone/email
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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
Verdict
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
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.
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.
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.
| Parameter | ServiceCalc | JMA America |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 4.0 (4 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 90.9% of reviews — better | 0.0% of reviews |
| Number of ratings | 4 — better | 1 |
| Update frequency | Every 2 months | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 12.0 — better | 26.5 |
| Further details — not scored | ||
| Size | 1 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Farren Domenici | Eduardo Romero |
Customer experience
ServiceCalc
JMA America
In-app purchases
ServiceCalc
No in-app purchases
JMA America
No in-app purchases
Questions
Is ServiceCalc free?
Is JMA America free?
Which has better reviews, ServiceCalc or JMA America?
Do ServiceCalc or JMA America have ads?
Which is updated more often, ServiceCalc or JMA America?
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