# Resistor vs DoSei

The clearest difference is ads: DoSei at none against Resistor's shown. Resistor's advantage is iOS requirement (13.0 vs 16.6). On price, update cadence, 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.

Resistor ships an update every 16 months, DoSei every 9 months. The most recent releases landed on September 27, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Resistor | DoSei |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (3 ratings)](https://appshunter.io/ios/app/resistor-electronics-tools/id6504726625/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 16 months | **Every 9 months** |
| Monetization | Ad-supported | — |
| Size | 22 MB | 1 MB |
| Requires iOS | **13.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Anas Abubakar](https://appshunter.io/developer/1581534101) | [MUNEATSU G.K.](https://appshunter.io/developer/1534902759) |

## What reviewers say

### 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


### DoSei

[App page](https://appshunter.io/ios/app/dosei/id6739622714)

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

**In-app purchases:** none


## Frequently asked questions

### Is Resistor free?

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

### Is DoSei free?

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

### Do Resistor or DoSei have ads?

Resistor shows ads; DoSei does not.

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

Resistor ships an update every 16 months, and DoSei every 9 months. Most recently, Resistor was updated on September 27, 2026 and DoSei on September 14, 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.*