# 555 Calc vs Circuit Resistance Creator

The clearest difference is review sentiment: Circuit Resistance Creator at 100% against 555 Calc's 50%. Circuit Resistance Creator also leads on rating (5.0 vs 4.0) and ads (none vs shown). 555 Calc's advantage is iOS requirement (11.0 vs 14.0). On price, ratings volume, 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.

Circuit Resistance Creator holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 3 and 3 respectively. Written reviews point the same way: 50% of 555 Calc's written reviews are positive against 100% of Circuit Resistance Creator's.

555 Calc ships an update every 20 months, Circuit Resistance Creator every 3 weeks. The most recent releases landed on October 28, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | 555 Calc | Circuit Resistance Creator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (3 ratings)](https://appshunter.io/ios/app/555-calc/id868058244/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/circuit-resistance-creator/id1475404949/reviews)** |
| Number of ratings | 3 | 3 |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 20 months | **Every 3 weeks** |
| Monetization | Ad-supported | **Free** |
| Size | 18 MB | 15 MB |
| Requires iOS | **11.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jibiki Works](https://appshunter.io/developer/556845808) | [David White](https://appshunter.io/developer/911163945) |

## What reviewers say

### 555 Calc

[App page](https://appshunter.io/ios/app/555-calc/id868058244)

This utility app helps engineers and hobbyists calculate resistor values for circuits using the Timer IC 555. Simply input frequency, duty ratio, and capacitor values to get the required resistor outputs.

**Highlights:** Calculate resistor values, Input frequency, Input duty ratio, Input capacitor value, Timer IC 555 circuit design

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

**In-app purchases:** none


### Circuit Resistance Creator

[App page](https://appshunter.io/ios/app/circuit-resistance-creator/id1475404949)

Calculate equivalent resistance for any resistor circuit. This tool is designed for students, technicians, and engineers, offering high accuracy for voltage, current, and resistance. It's a great way to check homework and perform engineering calculations.

**Highlights:** Equivalent resistance calculation, Supports any resistor circuit, High accuracy displays (6 decimal places), Apply custom circuit voltages, Designed for students and engineers, Homework checking tool

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 555 Calc free?

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

### Is Circuit Resistance Creator free?

Circuit Resistance Creator is free to download, with no in-app purchases.

### Which has better reviews, 555 Calc or Circuit Resistance Creator?

Circuit Resistance Creator is rated higher. 555 Calc averages 4.0 out of 5 from 3 ratings, while Circuit Resistance Creator averages 5.0 from 3 ratings.

### Do 555 Calc or Circuit Resistance Creator have ads?

555 Calc shows ads; Circuit Resistance Creator does not.

### Which is updated more often, 555 Calc or Circuit Resistance Creator?

555 Calc ships an update every 20 months, and Circuit Resistance Creator every 3 weeks. Most recently, 555 Calc was updated on October 28, 2026 and Circuit Resistance Creator on September 26, 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.*