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.
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
Read full descriptionHide 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
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.
- 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
Read full descriptionHide 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
Verdict
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
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.
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.
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.
| Parameter | ServiceCalc | Black Widow Key Machine V2 |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 4.0 (4 ratings) — better | 3.0 (2 ratings) |
| Positive reviews | 90.9% of reviews — better | 0.0% of reviews |
| Number of ratings | 4 — better | 2 |
| Update frequency | Every 2 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 1 MB | 317 MB |
| Age rating | 4+ | 4+ |
| Developer | Farren Domenici | Lock Labs, Inc. |
Customer experience
ServiceCalc
Black Widow Key Machine V2
In-app purchases
ServiceCalc
No in-app purchases
Black Widow Key Machine V2
No in-app purchases
Questions
Is ServiceCalc free?
Is Black Widow Key Machine V2 free?
Which has better reviews, ServiceCalc or Black Widow Key Machine V2?
Do ServiceCalc or Black Widow Key Machine V2 have ads?
Which is updated more often, ServiceCalc or Black Widow Key Machine V2?
Other comparisons















