Comparison

ServiceCalc vs Black Widow Key Machine V2

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

Black Widow Key Machine V2

This utility app allows locksmiths to cut various types of keys, including high-security, edge-cut, dimple, tibbe, and tubular blanks. It connects via Bluetooth to a mobile device for cutting keys by code, duplication, and progression.

Highlights
  • Cut high-security keys
  • Cut edge-cut keys
  • Cut dimple keys
  • Cut tibbe keys
  • Cut tubular keys
  • Bluetooth mobile connectivity
  • Cut by code, duplicate, and progression
Features
Read full description

The Black Widow R key machine is designed to quickly cut all keys a locksmith needs to run their business: high-security, edge-cut, dimple, tibbe, and tubular key blanks. Use your mobile device via Bluetooth to cut keys by code, duplicate, and progression your keys.

Screenshots

ServiceCalc4 screens
Black Widow Key Machine V21 screens

Verdict

The call

The clearest difference is review sentiment: ServiceCalc at 91% against Black Widow Key Machine V2's 0%. ServiceCalc also leads on rating (4.0 vs 3.0). Black Widow Key Machine V2's advantage is price (Free vs $0.99). On ratings volume, update cadence, ads and in-app purchases 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

Black Widow Key Machine V2 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 3.0. Both are backed by a comparable volume of ratings — 4 and 2 respectively. Written reviews point the same way: 91% of ServiceCalc's written reviews are positive against 0% of Black Widow Key Machine V2's.

UpkeepUpdate frequency

ServiceCalc ships an update every 2 months, Black Widow Key Machine V2 monthly. The most recent releases landed on October 10, 2026 and October 2, 2026 respectively.

Scorecard4 real differences · 6 level
ServiceCalc versus Black Widow Key Machine V2: the parameters behind the verdict, then further details
ParameterServiceCalcBlack Widow Key Machine V2
Price$0.99Free — better
Rating4.0 (4 ratings) — better3.0 (2 ratings)
Positive reviews90.9% of reviews — better0.0% of reviews
Number of ratings4 — better2
Update frequencyEvery 2 monthsMonthly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPodiPhone, iPod
Requires iOS12.012.0
Further details — not scored
Size1 MB317 MB
Age rating4+4+
DeveloperFarren DomeniciLock Labs, Inc.

Customer experience

ServiceCalc

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

Black Widow Key Machine V2

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

ServiceCalc

No in-app purchases

None

Black Widow Key Machine V2

No in-app purchases

Questions

Is ServiceCalc free?
ServiceCalc costs $0.99, with no in-app purchases.
Is Black Widow Key Machine V2 free?
Black Widow Key Machine V2 is free to download, with no in-app purchases.
Which has better reviews, ServiceCalc or Black Widow Key Machine V2?
ServiceCalc is rated higher. ServiceCalc averages 4.0 out of 5 from 4 ratings, while Black Widow Key Machine V2 averages 3.0 from 2 ratings.
Do ServiceCalc or Black Widow Key Machine V2 have ads?
Neither ServiceCalc nor Black Widow Key Machine V2 shows ads.
Which is updated more often, ServiceCalc or Black Widow Key Machine V2?
ServiceCalc ships an update every 2 months, and Black Widow Key Machine V2 monthly. Most recently, ServiceCalc was updated on October 10, 2026 and Black Widow Key Machine V2 on October 2, 2026.

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