# 555 Calc vs Breadbin

The clearest difference is price: 555 Calc at Free against Breadbin's $4.99. 555 Calc also leads on iOS requirement (11.0 vs 16.0). Breadbin's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 20 months). On in-app purchases and device support there is nothing between them.

555 Calc is free to download; Breadbin costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

555 Calc ships an update every 20 months, Breadbin every 3 weeks. The most recent releases landed on September 27, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | 555 Calc | Breadbin |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[4.0 (3 ratings)](https://appshunter.io/ios/app/555-calc/id868058244/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 20 months | **Every 3 weeks** |
| Monetization | Ad-supported | — |
| Size | 18 MB | 2 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Jibiki Works](https://appshunter.io/developer/556845808) | [LASZLO DOBROVOLSZKI](https://appshunter.io/developer/6779159106) |

## 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

**In-app purchases:** none


### Breadbin

[App page](https://appshunter.io/ios/app/breadbin/id6791975357)

**Features:** Game Controller support, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 555 Calc free?

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

### Is Breadbin free?

Breadbin costs $4.99, with no in-app purchases.

### Do 555 Calc or Breadbin have ads?

555 Calc shows ads; Breadbin does not.

### Which is updated more often, 555 Calc or Breadbin?

555 Calc ships an update every 20 months, and Breadbin every 3 weeks. Most recently, 555 Calc was updated on September 27, 2026 and Breadbin on October 7, 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.*