Comparison

GPTCH vs Resistor

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

Head to head
About

GPTCH

Features
Read full description

Using GPTCH, you can get help from AI from convenient business handling and simple travel plans. Try GPTCH, which is close to our daily lives, and experience convenience!

About

Resistor

This application simplifies electronic circuit calculations with tools for series/parallel resistance, LED current limiting, and three-phase circuit conversions. It also features a resistor color code decoder for quick component identification.

Highlights
  • Series/parallel resistor calculator
  • LED series resistor calculator
  • Star-delta and delta-star converters
  • Resistor color code decoder
  • Intuitive interface
Features
Read full description

Resistor Calc is an essential tool for anyone working with electronic circuits and resistors. Designed to streamline complex calculations and provide invaluable insights, this powerful app for iOS devices is a must-have in your toolkit. At the heart of Resistor Calc lies a comprehensive suite of calculators tailored to the needs of electrical engineers, students, hobbyists, and professionals. The series/parallel calculator makes it a breeze to determine the equivalent resistance for even the most intricate circuit configurations, eliminating the need for tedious manual calculations prone to errors. The LED series resistor calculator is a game-changer for those working with LED lighting systems. Simply input the required parameters, and Resistor Calc will recommend the ideal resistor value to ensure proper current limiting and protect your LEDs from potential damage, ensuring optimal performance and longevity. For three-phase circuits, the app's star-delta and delta-star converters streamline the process of switching between different wiring configurations. Whether you need to convert from star to delta or vice versa, Resistor Calc has you covered, saving you valuable time and effort. But the true standout feature of Resistor Calc is its powerful resistor color code decoder. Never again will you need to decipher those tiny colored bands manually. Simply input the color codes, and the app will instantly reveal the resistor's value, tolerance, and other essential information, making component identification a breeze and saving you countless hours of frustration. With its sleek and intuitive interface, Resistor Calc is designed for seamless navigation and ease of use. Whether you're a student grappling with complex circuit problems or a seasoned professional tackling intricate projects, this app empowers you with accurate and reliable calculations at your fingertips. Download Resistor Calc today and experience the power of efficient circuit analysis and resistor management on your iOS device. Streamline your workflow, minimize errors, and unlock new levels of productivity in your electrical engineering endeavours.

Screenshots

GPTCH3 screens
Resistor4 screens

Verdict

The call

The clearest difference is ads: GPTCH at none against Resistor's shown. GPTCH also leads on update cadence (every 4 months vs every 16 months). On price, in-app purchases, device support and iOS requirement 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

GPTCH ships an update every 4 months, Resistor every 16 months. Both last shipped on September 9, 2026.

Scorecard2 real differences · 8 level
GPTCH versus Resistor: the parameters behind the verdict, then further details
ParameterGPTCHResistor
PriceFreeFree
Rating—3.0 (3 ratings) — better
Positive reviews—50.0% of reviews
Number of ratings—3 — better
Update frequencyEvery 4 months — betterEvery 16 months
AdsNo — betterYes
In-app purchasesNoNo
Monetization—Ad-supported
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better13.0
Further details — not scored
Size34 MB22 MB
Age rating4+4+
DeveloperChung Sik ChoiAnas Abubakar

In-app purchases

None

GPTCH

No in-app purchases

None

Resistor

No in-app purchases

Questions

Is GPTCH free?
GPTCH is free to download, with no in-app purchases.
Is Resistor free?
Resistor is free to download, with no in-app purchases.
Do GPTCH or Resistor have ads?
Resistor shows ads; GPTCH does not.
Which is updated more often, GPTCH or Resistor?
GPTCH ships an update every 4 months, and Resistor every 16 months. Most recently, GPTCH was updated on September 9, 2026 and Resistor on September 9, 2026.

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