# 555 Calc vs Capacitor Calculator

The clearest difference is price: 555 Calc at Free against Capacitor Calculator's $2.99. 555 Calc also leads on rating (4.0 vs 3.8) and iOS requirement (11.0 vs 17.6). Capacitor Calculator's advantage is ads (none vs shown). On ratings volume, update cadence, in-app purchases and device support there is nothing between them.

555 Calc is free to download; Capacitor Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

555 Calc holds the better App Store score, 4.0 against 3.8. Both are backed by a comparable volume of ratings — 3 and 4 respectively.

555 Calc ships an update every 20 months, Capacitor Calculator every 29 months. The most recent releases landed on October 28, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | 555 Calc | Capacitor Calculator |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[4.0 (3 ratings)](https://appshunter.io/ios/app/555-calc/id868058244/reviews)** | [3.8 (4 ratings)](https://appshunter.io/ios/app/capacitor-calculator/id1366563133/reviews) |
| Number of ratings | 3 | **4** |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 20 months** | Every 29 months |
| Monetization | **Ad-supported** | Paid |
| Size | 18 MB | 1 MB |
| Requires iOS | **11.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jibiki Works](https://appshunter.io/developer/556845808) | [Nitrio](https://appshunter.io/developer/321121189) |

## 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 Calculator

[App page](https://appshunter.io/ios/app/capacitor-calculator/id1366563133)

This utility app calculates the time constant and energy stored in a capacitor. It helps understand the time-delay characteristics of electrical circuits when a voltage is applied.

**Highlights:** Calculate time constant (RC), Calculate energy stored (E), Input voltage, capacitance, and resistance, Understand capacitor charging/discharging, Analyze circuit time-delay

**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 Calculator free?

Capacitor Calculator costs $2.99, with no in-app purchases.

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

555 Calc is rated higher. 555 Calc averages 4.0 out of 5 from 3 ratings, while Capacitor Calculator averages 3.8 from 4 ratings.

### Do 555 Calc or Capacitor Calculator have ads?

555 Calc shows ads; Capacitor Calculator does not.

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

555 Calc ships an update every 20 months, and Capacitor Calculator every 29 months. Most recently, 555 Calc was updated on October 28, 2026 and Capacitor Calculator on October 27, 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.*