Comparison

iHP48 vs Resistor

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

Head to head
About

iHP48

This app brings the powerful HP48 calculator experience to your mobile device. It offers enhanced performance, seamless file management, and a customizable interface with support for various HP calculator models. Enjoy a familiar and convenient calculator solution without needing extra hardware.

Highlights
  • Supports HP38, HP39, HP48, HP49, HP50 calculators
  • Haptic feedback and customizable zoom options
  • Seamless file transfer via iTunes and Files app
  • Cloud storage integration (iCloud, OneDrive, Dropbox)
  • Object saving/loading and copy/paste functionality
  • Access to calculator packages, skins, and ROMs
  • Internal file manager and extensible settings
Features
Read full description

Introducing iHP48 - Your Ultimate Calculator Companion iHP48 emerges from the necessity to revive the unparalleled calculator experience cherished by university students and engineers across various disciplines. Reviving the legacy of the original calculator, iHP48 delivers enhanced performance without the burden of carrying an additional device in your bag. Experience the simplicity and convenience of having the powerful HP48 at your fingertips once again. Key Features: Wide Compatibility: iHP48 supports HP38, HP39, HP48, HP49, and HP50 calculators. Easily configure your preferred calculator with the Fetch options. Enhanced User Experience: Enjoy Haptic feedback on keypress and customizable haptic styles via Settings. Zoom options tailored to your iPhone and preferences, including a new lift zoom for XS devices. Seamless File Management: Transfer files effortlessly from your computer using iTunes on both PC's and MacOS. Access iHP48 files directly from your device using the Files app and share them with any compatible iOS app. Copy files to and from your favorite cloud providers supported by the Files app, such as iCloud Drive, OneDrive, and Dropbox. Convenient Object Handling: Save or Load objects to/from your device using Files, ensuring your favorite .lib is readily available on your iHP48 stack. Copy and Paste supported objects seamlessly between iOS and the iHP48 Stack. Comprehensive Library: Access a rich library of Calculator Packages, Skin Collections, ROM's, and useful libraries like Meta Kernel and QPI. Intuitive Interface: Benefit from an internal File Manager for simplified file management and an extensible Settings administration accessible directly from the Settings app or via a shortcut from the iHP48 menu. Customizable Experience: Save your current calculator configuration for easy access. Explore special features embedded in various skins, including screen swipes, sounds, and orientation options. No Hidden Costs: iHP48 is completely free, devoid of any enterprise, professional, plus, or ultimate versions. There are no hidden features or payments required. We greatly appreciate any support you offer as we continue to enhance and refine iHP48. For additional information, visit https://www.thinkchile.com/iHP48. Experience the power of the legendary HP48, reinvented for the modern era with iHP48.

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

iHP484 screens
Resistor4 screens

Verdict

The call

The clearest difference is rating: iHP48 at 4.7 against Resistor's 3.0. iHP48 also leads on review sentiment (88% vs 50%) and ads (none vs shown). Resistor's advantage is iOS requirement (13.0 vs 15.0). On price, 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

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

ReceptionRating · Positive reviews · Number of ratings

iHP48 holds the better App Store score, 4.7 against 3.0. That said, the two scores are not equally well evidenced: iHP48 has 270 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 88% of iHP48's written reviews are positive against 50% of Resistor's.

UpkeepUpdate frequency

iHP48 ships an update monthly, Resistor every 16 months. The most recent releases landed on September 19, 2026 and September 9, 2026 respectively.

Scorecard7 real differences · 3 level
iHP48 versus Resistor: the parameters behind the verdict, then further details
ParameteriHP48Resistor
PriceFreeFree
Rating4.7 (270 ratings) — better3.0 (3 ratings)
Positive reviews88.2% of reviews — better50.0% of reviews
Number of ratings270 — better3
Update frequencyMonthly — betterEvery 16 months
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree — betterAd-supported
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.013.0 — better
Further details — not scored
Size6 MB22 MB
Age rating4+4+
DeveloperAlexis LorcaAnas Abubakar

Customer experience

iHP48

All ratings270 ratings
Positive90.7%
Neutral3.0%
Negative6.3%
Written reviews195 reviews
Positive88.2%
Neutral4.1%
Negative7.7%

Resistor

All ratings3 ratings
Positive33.3%
Neutral33.3%
Negative33.3%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

Bugs and requests

iHP48

Reported bugs

3 issues
  • Crashes on startup
  • Inability to save state across sessions
  • Incompatibility with certain iOS devices

Requested features

4 requests
  • Dark mode option
  • Ability to disable haptic feedback
  • Support for HP50G emulation
  • Improved keyboard mapping and arrow key functionality

Resistor

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

iHP48

No in-app purchases

None

Resistor

No in-app purchases

Questions

Is iHP48 free?
iHP48 is free to download, with no in-app purchases.
Is Resistor free?
Resistor is free to download, with no in-app purchases.
Which has better reviews, iHP48 or Resistor?
iHP48 is rated higher. iHP48 averages 4.7 out of 5 from 270 ratings, while Resistor averages 3.0 from 3 ratings.
Do iHP48 or Resistor have ads?
Resistor shows ads; iHP48 does not.
Which is updated more often, iHP48 or Resistor?
iHP48 ships an update monthly, and Resistor every 16 months. Most recently, iHP48 was updated on September 19, 2026 and Resistor on September 9, 2026.

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