# 555 Calc vs Capacitor

The clearest difference is review sentiment: Capacitor at 100% against 555 Calc's 50%. Capacitor also leads on rating (4.8 vs 4.0) and ads (none vs shown). 555 Calc's advantage is iOS requirement (11.0 vs 26.0). 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.

Capacitor holds the better App Store score, 4.8 against 4.0. Both are backed by a comparable volume of ratings — 3 and 10 respectively. Written reviews point the same way: 50% of 555 Calc's written reviews are positive against 100% of Capacitor's.

555 Calc ships an update every 20 months, Capacitor every 40 months. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 555 Calc | Capacitor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (3 ratings)](https://appshunter.io/ios/app/555-calc/id868058244/reviews) | **[4.8 (10 ratings)](https://appshunter.io/ios/app/capacitor-converter/id6447107842/reviews)** |
| Number of ratings | 3 | **10** |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 20 months** | Every 40 months |
| Monetization | Ad-supported | **Free** |
| Size | 18 MB | 8 MB |
| Requires iOS | **11.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jibiki Works](https://appshunter.io/developer/556845808) | [Gerhard Lentschik](https://appshunter.io/developer/629988041) |

## 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


### Capacitor

[App page](https://appshunter.io/ios/app/capacitor-converter/id6447107842)

Easily determine capacitor values from color codes or calculate color codes from values. Supports both standard and SMD capacitors, providing quick and accurate conversions for electronics projects.

**Highlights:** Capacitor color code to value conversion, Value to capacitor color code conversion, SMD capacitor code to value conversion, SMD value to EIA code calculation, Supports standard and SMD capacitors

**Features:** macOS Compatibility, 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 Capacitor free?

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

### Which has better reviews, 555 Calc or Capacitor?

Capacitor is rated higher. 555 Calc averages 4.0 out of 5 from 3 ratings, while Capacitor averages 4.8 from 10 ratings.

### Do 555 Calc or Capacitor have ads?

555 Calc shows ads; Capacitor does not.

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

555 Calc ships an update every 20 months, and Capacitor every 40 months. Most recently, 555 Calc was updated on October 28, 2026 and Capacitor on October 24, 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.*