Comparison

Resistor Plus vs Amatrol eLearning

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

Head to head
About

Resistor Plus

Easily calculate resistor values and tolerance using color codes. Simply select the colors for each band, and the app instantly displays the resistance in ohms. Save your results with screenshots for future reference.

Highlights
  • Resistor color code calculation
  • Tolerance calculation
  • Instant results display
  • Copy result functionality
  • Screenshot capability
  • Works on iPhone and iPad
  • Ad-free and private
Features
Read full description

Resistor Calculator is the essential tool for electronics engineers, hobbyists, makers, and students. Instantly decode resistor color bands, calculate circuit values, and look up standard resistor values — all in one app. RESISTOR COLOR CODE CALCULATOR • Support for 4-band, 5-band, and 6-band resistors • Tap color bands on a realistic resistor graphic to read values instantly • View resistance, tolerance, min/max range, and temperature coefficient • Intuitive color picker with all standard EIA color codes REVERSE LOOKUP • Enter a resistance value and get the matching color band combination • Find the closest standard value from E-series tables • Perfect for designing circuits and selecting components SERIES & PARALLEL CALCULATOR • Calculate total resistance for resistors in series or parallel • Add unlimited resistors with engineering notation input (e.g. 4.7k, 2.2M) • See live results with formula reference VOLTAGE DIVIDER • Solve for output voltage (Vout) or unknown resistor (R2) • Interactive circuit diagram updates in real time • Supports engineering notation for quick input E-SERIES REFERENCE LIBRARY • Browse standard resistor values from E12, E24, E48, E96, and E192 series • Search and filter values instantly • Tap to copy any value to clipboard DESIGNED FOR ENGINEERS • Clean, distraction-free interface • Works on iPhone and iPad • No ads, no subscriptions, no internet required • Haptic feedback for a responsive experience Whether you are building your first LED circuit or designing professional PCBs, Resistor Calculator Pro gives you fast, accurate answers right on your device. Download now and keep the most useful resistor tool in your pocket. Resistor Parameters: Band Digit Black - 0 Brown - 1 Red - 2 Orange - 3 Yellow - 4 Green - 5 Blue - 6 Violet - 7 Grey - 8 White - 9 Band Multiplier Black × 1 Ω Brown × 10 Ω Red × 100 Ω Orange × 1 kΩ Yellow × 10 kΩ Green × 100 kΩ Blue × 1 MΩ Violet × 10 MΩ Gold × 0.1 Ω Silver × 0.01 Ω Band Tolerance Brown - 1% Red - 2% Gold - 5% Silver - 10% A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, divide voltages, bias active elements, and terminate transmission lines, among other uses. A resistor opposes the flow of electrical current; the higher the value of the resistor, the more it opposes the current flow. Values are given in ohms. Thank you for your support! Visit nitrio.com for more apps for your iOS devices.

About

Amatrol eLearning

Access a vast library of technical training courses on your mobile device. This comprehensive curriculum covers foundational to advanced industrial topics with interactive multimedia content designed for various learning styles. Requires an active subscription through an organization or school.

Highlights
  • Access technical training curriculum
  • Hundreds of courses available
  • Thousands of hours of training
  • Covers basic to advanced industrial topics
  • Competency-based instructional design
  • Interactive multimedia format
Features
Read full description

The Amatrol app allows learners to access the world’s premier technical training curriculum using their mobile devices if they have an active subscription from their organization or school. Amatrol eLearning represents the most comprehensive, complete technical training solution available today. The Amatrol library consists of hundreds of courses with thousands of hours of in-depth technical training, and it’s always expanding. Amatrol’s technical training eLearning covers topics like basic electrical, fluid power, and mechanical to advanced topics such as programmable logic controllers, industrial robots, and Industry 4.0 practices. Amatrol eLearning features a competency-based instructional design that focuses on skill development directly related to the core competencies relevant to modern industries. Each course begins with foundational knowledge and builds to more complex topics. The interactive multimedia format of Amatrol’s eLearning also appeals to learners with different learning styles. Whether you’re an auditory, visual, or kinesthetic learner, Amatrol eLearning includes features that let you learn in the style that suits you best.

Screenshots

Resistor Plus4 screens
Amatrol eLearning4 screens

Verdict

The call

The clearest difference is price: Amatrol eLearning at Free against Resistor Plus's $2.99. Amatrol eLearning also leads on update cadence (monthly vs every 20 months) and iOS requirement (13.0 vs 16.6). On review sentiment, ads, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Amatrol eLearning is free to download; Resistor Plus costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Resistor Plus ships an update every 20 months, Amatrol eLearning monthly. The most recent releases landed on October 2, 2026 and September 22, 2026 respectively.

Scorecard4 real differences · 6 level
Resistor Plus versus Amatrol eLearning: the parameters behind the verdict, then further details
ParameterResistor PlusAmatrol eLearning
Price$2.99Free — better
Rating—2.2 (6 ratings) — better
Positive reviews0.0% of reviews0.0% of reviews
Number of ratings—6 — better
Update frequencyEvery 20 monthsMonthly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.613.0 — better
Further details — not scored
Size1 MB72 MB
Age rating4+4+
DeveloperNitrioAmatrol, Inc.

Customer experience

Resistor Plus

Written reviews3 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Amatrol eLearning

All ratings6 ratings
Positive16.7%
Neutral16.7%
Negative66.7%
Written reviews4 reviews
Positive0.0%
Neutral25.0%
Negative75.0%

In-app purchases

None

Resistor Plus

No in-app purchases

None

Amatrol eLearning

No in-app purchases

Questions

Is Resistor Plus free?
Resistor Plus costs $2.99, with no in-app purchases.
Is Amatrol eLearning free?
Amatrol eLearning is free to download, with no in-app purchases.
Do Resistor Plus or Amatrol eLearning have ads?
Neither Resistor Plus nor Amatrol eLearning shows ads.
Which is updated more often, Resistor Plus or Amatrol eLearning?
Resistor Plus ships an update every 20 months, and Amatrol eLearning monthly. Most recently, Resistor Plus was updated on October 2, 2026 and Amatrol eLearning on September 22, 2026.

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