# Resistor AI Calculator vs EngKit

The clearest difference is in-app purchases: Resistor AI Calculator at none against EngKit's 1. Resistor AI Calculator also leads on iOS requirement (15.0 vs 26.1). EngKit's advantage is ads (none vs shown) and update cadence (fortnightly vs every 15 months). On price and device support there is nothing between them.

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

Resistor AI Calculator ships an update every 15 months, EngKit fortnightly. The most recent releases landed on October 15, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Resistor AI Calculator | EngKit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.6 (5 ratings)](https://appshunter.io/ios/app/resistor-ai-calculator/id1587462977/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 15 months | **Fortnightly** |
| Monetization | Ad-supported | — |
| Size | 71 MB | 5 MB |
| Requires iOS | **15.0** | 26.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Daichi Takigawa](https://appshunter.io/developer/1569940550) | [Rodrigo Vivas](https://appshunter.io/developer/6813992944) |

## What reviewers say

### Resistor AI Calculator

[App page](https://appshunter.io/ios/app/resistor-ai-calculator/id1587462977)

Point your phone's camera at a resistor to instantly identify its value. Currently supports 4-band carbon film resistors with a 5% tolerance.

**Highlights:** Real-time resistor detection, Automatic resistance calculation, Supports 4-band carbon film resistors, 5% margin of error detection, Uses smartphone camera

**Features:** macOS Compatibility

**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 AI Calculator free?

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

### Is EngKit free?

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

### Do Resistor AI Calculator or EngKit have ads?

Resistor AI Calculator shows ads; EngKit does not.

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

Resistor AI Calculator ships an update every 15 months, and EngKit fortnightly. Most recently, Resistor AI Calculator was updated on October 15, 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.*