Comparison

Voltage Divider vs CALC Smart Calculator ±

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Voltage Divider

This engineering utility calculates unknown values in a voltage divider circuit. It can solve for voltages or resistor values, displaying ideal and actual resistor options. It also shows current, power, and voltage tolerance.

Highlights
  • Solves for Vin, Vout, R1, or R2
  • Resistor picker with actual values
  • Displays ideal resistor value
  • Calculates voltage tolerance
  • Shows current and power consumption
Features
Read full description

A handy engineering utility that solves for voltages or resistor values in a common voltage divider circuit. Enter three terms (out of Vin, Vout, R1 or R2) and this app will solve for the fourth term automatically. The resistor picker will only let you pick from actual resistor values that exist. It's a great time saving tool for quickly selecting resistor values in a switching power supply design or any other circuit that incorporates a voltage divider. When solving for a voltage, select two resistor values and one of the voltages. The remaining voltage will be displayed automatically. The max and min possible voltages will also be displayed based on the resistor tolerances. The current and power through the divider will be displayed at the bottom of the screen. When solving for a resistor value, select two voltages and one resistor value. The remaining resistor value will be displayed in yellow. This is an ideal value. Use the resistor picker to select an actual resistor value close to that ideal value. You can then tell the app to solve for Vin or Vout to see if the resulting voltage meets your design requirements.

About

CALC Smart Calculator ±

This app offers a versatile calculator experience with basic, scientific, and advanced modes. It features real-time results, unit conversions, custom functions, and a shareable history. Optimized for various Apple devices, it's designed for ease of use by students, professionals, and scientists.

Highlights
  • Real-time results
  • Unit and currency conversions
  • Custom functions and constants
  • Shareable calculation history
  • Landscape mode with tape-roll
  • Gratuity calculator
Features
Read full description

Why Choose CALC Smart? ► Used by Scientists, Professionals and Students alike ► Apple-Featured: Spotlighted in Utilities and Calculate & Convert. ► User-Loved: Over 10k+ global reviews and 200M+ sessions validate its utility. ► Educator-Certified: Praised by teachers on the Educational App Store for its intuitive UI. Ready for the Latest OS * Multitask on your iPad and use 3D Touch shortcuts. * Search your calculation history with Spotlight. * Widget with history integration. * Apple Watch support, complete with haptic feedback and complications. Top 10 Unique Features ① Real-time results, even with incomplete parentheses. ② Landscape mode for shareable history and tape-roll. ③ Optimized custom keyboard & widget to save space and time. ④ Fast unit and currency conversions—a swipe away. ⑤ Quick gratuity calculator with rounding options. ⑥ Display decimals as fractions with 1/999 precision. ⑦ Create unlimited custom functions and constants. ⑧ Easy expression sharing via link. ⑨ Built-in timer. ⑩ Limitless themes and layouts. Why Users Love CALC * Live Math: Natural input, even for complex calculations. * Swipe Functions: Over 60 advanced math functions just a swipe away. * History: Never lose track of your calculations. * Conversion: 21 categories, plus custom options. Additional Features * Edit on the Fly: Long-press to modify expressions and numbers. * Audio Feedback: Customize tapping sounds. * Styling: Multiple font choices. * Enterprise-Ready: EMM support with MDM & AppConfig. We Listen * Frequent updates based on your feedback. Got a suggestion? Visit our UserVoice page: https://QApps.UserVoice.com Custom Background Tip * Design your own CALC background with images from NASA’s multimedia library: https://nasa.gov/multimedia Terms & Usage * Using this app means agreeing to the standard Terms of Use. Standard Terms of Use (EULA) - https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Voltage Divider3 screens
CALC Smart Calculator ±4 screens

Verdict

The call

The clearest difference is price: CALC Smart Calculator ± at Free against Voltage Divider's $1.99. CALC Smart Calculator ± also leads on rating (4.8 vs 2.7) and review sentiment (87% vs 56%). Voltage Divider's advantage is in-app purchases (none vs 4) and iOS requirement (12.0 vs 17.0). On ads 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

CALC Smart Calculator ± is free to download; Voltage Divider costs $1.99 up front. CALC Smart Calculator ± sells 4 in-app purchases, starting at $0.99 per 3 months. Voltage Divider asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

CALC Smart Calculator ± holds the better App Store score, 4.8 against 2.7. That said, the two scores are not equally well evidenced: CALC Smart Calculator ± has 2.4K ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 56% of Voltage Divider's written reviews are positive against 87% of CALC Smart Calculator ±'s.

UpkeepUpdate frequency

Voltage Divider ships an update every 48 months, CALC Smart Calculator ± fortnightly. Both last shipped on October 23, 2026.

Scorecard9 real differences · 1 level
Voltage Divider versus CALC Smart Calculator ±: the parameters behind the verdict, then further details
ParameterVoltage DividerCALC Smart Calculator ±
Price$1.99Free — better
Rating2.7 (3 ratings)4.8 (2.4K ratings) — better
Positive reviews55.6% of reviews87.3% of reviews — better
Number of ratings32.4K — better
Update frequencyEvery 48 monthsFortnightly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPodiPhone, iPad, Mac, Apple Watch — better
Requires iOS12.0 — better17.0
Further details — not scored
Size1 MB16 MB
Age rating4+4+
DeveloperDitty Labs, LLCQApps LLC

Customer experience

Voltage Divider

All ratings3 ratings
Positive33.3%
Neutral0.0%
Negative66.7%
Written reviews9 reviews
Positive55.6%
Neutral11.1%
Negative33.3%

CALC Smart Calculator ±

All ratings2,370 ratings
Positive96.7%
Neutral2.1%
Negative1.2%
Written reviews640 reviews
Positive87.3%
Neutral3.9%
Negative8.8%

Bugs and requests

Voltage Divider

Not enough reviews yet to summarise bugs or requests.

CALC Smart Calculator ±

Reported bugs

3 issues
  • Calculation errors in certain scenarios
  • Forced tutorial popup on every launch
  • Unreliable widget functionality

Requested features

4 requests
  • Ability to easily clear calculation history
  • Option to customize button layout
  • Support for entering hexadecimal numbers
  • Integration with other apps and services

In-app purchases

None

Voltage Divider

No in-app purchases

4 purchases

CALC Smart Calculator ±

Subscriptions4
  • Quarterly Supporter$0.993 Months
  • Quarterly Supporter7 Days trial$1.993 Months
  • Annual Contributor$2.991 Year
Show 1 more
  • Annual Contributor7 Days trial$5.991 Year

Questions

Is Voltage Divider free?
Voltage Divider costs $1.99, with no in-app purchases.
Is CALC Smart Calculator ± free?
CALC Smart Calculator ± is free to download, with in-app purchases available.
Which has better reviews, Voltage Divider or CALC Smart Calculator ±?
CALC Smart Calculator ± is rated higher. Voltage Divider averages 2.7 out of 5 from 3 ratings, while CALC Smart Calculator ± averages 4.8 from 2.4K ratings.
Do Voltage Divider or CALC Smart Calculator ± have ads?
Neither Voltage Divider nor CALC Smart Calculator ± shows ads.
Which is updated more often, Voltage Divider or CALC Smart Calculator ±?
Voltage Divider ships an update every 48 months, and CALC Smart Calculator ± fortnightly. Most recently, Voltage Divider was updated on October 23, 2026 and CALC Smart Calculator ± on October 23, 2026.

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