# Resistor vs EngKit

The clearest difference is in-app purchases: Resistor at none against EngKit's 1. EngKit's advantage is update cadence (fortnightly vs every 9 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. EngKit sells 1 one-off in-app purchase. Resistor asks for nothing beyond the download.

Resistor ships an update every 9 months, EngKit fortnightly. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Resistor | EngKit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (19 ratings)](https://appshunter.io/ios/app/resistor-converter/id6446839759/reviews)** | — |
| Number of ratings | **19** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Fortnightly** |
| Monetization | Free | — |
| Size | 8 MB | 5 MB |
| Requires iOS | **26.0** | 26.1 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Gerhard Lentschik](https://appshunter.io/developer/629988041) | [Rodrigo Vivas](https://appshunter.io/developer/6813992944) |

## What reviewers say

### Resistor

[App page](https://appshunter.io/ios/app/resistor-converter/id6446839759)

Quickly calculate resistor values from color bands or SMD codes, and vice versa. This tool is ideal for electronics enthusiasts, students, and DIYers working with 4, 5, or 6-band resistors and various SMD codes. It functions offline and requires no registration.

**Highlights:** Calculate resistor values from color bands, Convert resistor values to color bands, Supports 4, 5, and 6-band resistors, Handles SMD codes (EIA-3, EIA-4, EIA-96), Works offline, No registration required

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### EngKit

[App page](https://appshunter.io/ios/app/engkit/id6813992942)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Unlock | $6.99 | one-time |


## Frequently asked questions

### Is Resistor free?

Resistor is free to download, with no in-app purchases.

### Is EngKit free?

EngKit is free to download, with in-app purchases available.

### Do Resistor or EngKit have ads?

Neither Resistor nor EngKit shows ads.

### Which is updated more often, Resistor or EngKit?

Resistor ships an update every 9 months, and EngKit fortnightly. Most recently, Resistor was updated on October 24, 2026 and EngKit on October 29, 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.*