# iHP48 vs Resistor

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.

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

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.

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

## The numbers

| Metric | iHP48 | Resistor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (270 ratings)](https://appshunter.io/ios/app/ihp48/id1549608953/reviews)** | [3.0 (3 ratings)](https://appshunter.io/ios/app/resistor-electronics-tools/id6504726625/reviews) |
| Number of ratings | **270** | 3 |
| Positive reviews | **88.2% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Monthly** | Every 16 months |
| Monetization | **Free** | Ad-supported |
| Size | 6 MB | 22 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alexis Lorca](https://appshunter.io/developer/1549608955) | [Anas Abubakar](https://appshunter.io/developer/1581534101) |

## What reviewers say

### iHP48

[App page](https://appshunter.io/ios/app/ihp48/id1549608953)

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:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 🚀 Excellent emulation of HP48
- 👍 Familiar and nostalgic feel
- 👍 Comprehensive functionality
- 👍 Customizable skins
- 👍 Haptic feedback

**What reviewers complain about**

- 🐛 Occasional crashes or freezes
- 🐛 Missed keystrokes when typing quickly
- 🐛 Blank or flickering display
- 🐛 Compatibility issues with newer iOS versions

**Reported bugs**

- Crashes on startup
- Inability to save state across sessions
- Incompatibility with certain iOS devices

**Requested features**

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


### Resistor

[App page](https://appshunter.io/ios/app/resistor-electronics-tools/id6504726625)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*