Trigonometry Help vs Southwire® Voltage Drop Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Trigonometry Help
This app helps you quickly solve for unknown angles and sides of right-angled triangles. It provides a workings view for understanding the math, a scale drawing of the triangle, and a reference for basic trigonometric formulas. You can input angles in various formats and choose your desired decimal precision.
- Solve right-angled triangles
- Workings view for solutions
- Scale drawing of solved triangle
- Basic trig formulae reference
- Multiple angle input formats
- Customizable decimal places
Read full descriptionHide full description
Trig Help is a simple triangle calculator that enables you to quickly and easily find unknown angles & sides of any right-angled triangle. Features Include: - Accurately solve right-angled triangles - Workings view, so you can see the math behind the solutions (requires optional upgrade) - View a scale drawing of your solved triangle - View a handy set of basic trig formulae - Enter angles in radians, decimal degrees or degrees, minutes, seconds - Select your preferred number of decimal places What two App Store reviewers had to say about Trig Help: "I could never remember those simple formulas. I always had to dig out my text books from MANY YEARS ago to refresh my memory. THIS LITTLE APP IS A DELIGHT TO USE! I love it! Even my engineer friends are impressed. THANKS!" 5 Stars "Easy to use and accurate with high degree of precision. Would recommend to any toolmaker." 5 Stars Also available for OS X on the Mac App Store.
Southwire® Voltage Drop Calc
Calculate the appropriate wire size for electrical circuits. This tool helps determine wire size based on voltage drop and current carrying capacity, ensuring compliance with NEC ampacity limits.
- Determine wire size for voltage drop
- Calculate voltage drop for conductor runs
- Limit wire size by voltage drop
- Limit wire size by NEC ampacity
- Supports AWG and KCMIL sizes
Read full descriptionHide full description
Southwire's voltage drop calculator will help you determine the proper wire size for an electrical circuit based on the voltage drop and current carrying capacity of an electrical circuit. Determines wire size to meet specific voltage drop limits or calculates voltage drop for a specific conductor run. When sizing conductors, calculations limits wire size to voltage drop and NEC ampacity. Southwire's Voltage Drop Calculator is designed for applications using AWG and KCMIL sizes only.
Screenshots
Verdict
The clearest difference is price: Southwire® Voltage Drop Calc at Free against Trigonometry Help's $1.99. Southwire® Voltage Drop Calc also leads on in-app purchases (none vs 3) and update cadence (every 2 months vs every 13 months). Trigonometry Help's advantage is review sentiment (91% vs 48%) and iOS requirement (10.0 vs 15.0). On rating, ads 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
Southwire® Voltage Drop Calc is free to download; Trigonometry Help costs $1.99 up front. Trigonometry Help sells 3 one-off in-app purchases. Southwire® Voltage Drop Calc asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.7 for Trigonometry Help against 4.6 for Southwire® Voltage Drop Calc. Both are backed by a comparable volume of ratings — 480 and 1.5K respectively. Written reviews are what separate them: 91% of Trigonometry Help's written reviews are positive against 48% of Southwire® Voltage Drop Calc's.
Trigonometry Help ships an update every 13 months, Southwire® Voltage Drop Calc every 2 months. Both last shipped on October 20, 2026.
| Parameter | Trigonometry Help | Southwire® Voltage Drop Calc |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 4.7 (480 ratings) — better | 4.6 (1.5K ratings) |
| Positive reviews | 91.0% of reviews — better | 48.1% of reviews |
| Number of ratings | 480 | 1.5K — better |
| Update frequency | Every 13 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 21 MB | 10 MB |
| Age rating | +4 | 4+ |
| Developer | Armchair Engineering | Southwire Company |
Customer experience
Trigonometry Help
Southwire® Voltage Drop Calc
User reviews
Trigonometry Help
From 480 App Store ratingsWhat we love
- 🚀 Quick and easy to use
- 👍 User-friendly interface
- 🔧 Helpful for tradesmen and professionals
- ⚙️ Accurate calculations
- 🔍 Convenient for on-site use
Room to improve
- 🔢 Limited to right-angled triangles only
- 🔍 Lacks advanced trig functions
- 🔀 No option to rotate/flip the triangle view
Southwire® Voltage Drop Calc
From 1.5K App Store ratingsWhat we love
- 🚀 Quick and useful
- 🚀 Great Quick Reference
- 👍 A must have app for electricians
- 👍 Love These
- 👍 Electrical Engineer
Room to improve
- 🐛 Motor starting Voltage drop
- 🐛 Useless!
- 🐛 Won't work
- 🐛 How to use
- 🐛 Confused
Bugs and requests
Trigonometry Help
Reported bugs
2 issues- Inconsistent performance on older devices
- Occasional crashes or freezes
Requested features
3 requests- Support for irregular triangles
- Ability to show step-by-step workings
- Option to switch between degrees/minutes/seconds and decimal values
Southwire® Voltage Drop Calc
Reported bugs
24 issues- Useless!
- Won't work
- How to use
- Confused
- Bad app
Show 19 moreShow fewer
- Bad
- Not applicable for Residential
- Electrician
- Terrible
- Not working
- What??
- Terrible
- Don't work
- Terrible
- Choice Between AWG and Metric wire Gauge
- Updated app not so simple
- The last version was better
- App
- Terrible
- Voltage drop calculator
- IOS 8
- One flaw
- Worst app ever
- Average
Requested features
2 requests- Motor starting Voltage drop calculation
- Metric wire size options
In-app purchases
Trigonometry Help
- Trig Help Premium$0.99
- Trig Help Premium$1.99
- Trig Help Premium$3.99
Southwire® Voltage Drop Calc
No in-app purchases
Questions
Is Trigonometry Help free?
Is Southwire® Voltage Drop Calc free?
Which has better reviews, Trigonometry Help or Southwire® Voltage Drop Calc?
Do Trigonometry Help or Southwire® Voltage Drop Calc have ads?
Which is updated more often, Trigonometry Help or Southwire® Voltage Drop Calc?
Other comparisons
