A Complex Calc vs Resistor Calc+
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
A Complex Calc
Perform complex calculations with a modern, user-friendly interface. Offers both basic and scientific modes, including support for complex numbers and advanced functions. This lightweight application provides a history of computations and is completely free with no advertisements.
- Complex number support
- Basic and Scientific modes
- History of operations
- Trigonometric and hyperbolic functions
- Random number generation
- Lightweight app size
Read full descriptionHide full description
Work with complex numbers, scientific functions and unit conversions on your iPhone. A Complex Calc keeps your expression, result and next step together. EDIT WITHOUT STARTING OVER Place the cursor where you need a correction, reopen your latest submitted expression, or edit History entries that retain their original input. Paste supported expressions and review them before calculating. Undo and redo recent input changes during your current session. USE SCIENTIFIC TOOLS IN PORTRAIT Choose Basic or Scientific without rotating your phone. Keep trigonometric functions, logarithms, powers and constants close, with degree and radian controls. CONVERT UNITS ON THE SAME SCREEN Convert length, area, volume, mass, temperature, speed, energy, power, pressure, time, angles and electrical quantities. Swap compatible units, copy a converted value, and return to your calculator session. KEEP AND SHARE USEFUL WORK Mark History entries as favorites and filter them for quick access. Share a completed or saved calculation as text or a PNG image, with its recorded expression and result. SEE COMPLEX RESULTS CLEARLY Compare rectangular and polar forms, inspect the complex-plane diagram, and copy either representation. Clearer error guidance helps you correct an expression, while automatic scientific notation keeps small nonzero results visible. Requires iOS 18 or later.
Resistor Calc+
This utility helps you determine the resistance value of resistors by interpreting their colored bands. It supports 3, 4, 5, and 6 band resistors, visually displaying your selections and the calculated resistance and tolerance.
- Calculates resistance for 3-6 band resistors
- Visual band color selection
- Displays resistance and tolerance
- Aids electronics configuration
- User-friendly interface
Read full descriptionHide full description
Resistor color code calculator helps determine the resistance value indicated by the colored band. You can use it for 3, 4, 5 and 6 band resistors. You can click the band in the color table to select a color for that band. The resistor visually shows your band color selection and displays the corresponding resistance value. It will help you configure your electronics. How to use the resistance color code calculator - Please select the number of band colors first. - Select the color of the band by clicking on the corresponding box in the color chart. - The corresponding resistance value and the tolerance of the resistance are displayed.
Screenshots
Verdict
The clearest difference is ads: A Complex Calc at none against Resistor Calc+'s shown. A Complex Calc also leads on update cadence (every 4 weeks vs every 2 months) and review sentiment (80% vs 67%). Resistor Calc+'s advantage is rating (5.0 vs 4.7) and device support (3 vs 1). On price 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Resistor Calc+ holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 24 and 5 respectively. Written reviews complicate that: 80% of A Complex Calc's written reviews are positive against 67% of Resistor Calc+'s, so the app with the better star average is not the one people write more warmly about.
A Complex Calc ships an update every 4 weeks, Resistor Calc+ every 2 months. The most recent releases landed on October 24, 2026 and October 7, 2026 respectively.
| Parameter | A Complex Calc | Resistor Calc+ |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (24 ratings) | 5.0 (5 ratings) — better |
| Positive reviews | 80.0% of reviews — better | 66.7% of reviews |
| Number of ratings | 24 — better | 5 |
| Update frequency | Every 4 weeks — better | Every 2 months |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 18.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 8 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Antonio Ruffolo | EONSOFT |
Customer experience
A Complex Calc
Resistor Calc+
In-app purchases
A Complex Calc
No in-app purchases
Resistor Calc+
No in-app purchases
Questions
Is A Complex Calc free?
Is Resistor Calc+ free?
Which has better reviews, A Complex Calc or Resistor Calc+?
Do A Complex Calc or Resistor Calc+ have ads?
Which is updated more often, A Complex Calc or Resistor Calc+?
Other comparisons
