# Voltage Divider vs 555 Calc

The clearest difference is price: 555 Calc at Free against Voltage Divider's $1.99. 555 Calc also leads on rating (4.0 vs 2.7) and update cadence (every 20 months vs every 48 months). Voltage Divider's advantage is ads (none vs shown). On review sentiment, ratings volume, in-app purchases and device support there is nothing between them.

555 Calc is free to download; Voltage Divider costs $1.99 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 2.7. Both are backed by a comparable volume of ratings — 3 and 3 respectively. Written reviews complicate that: 56% of Voltage Divider's written reviews are positive against 50% of 555 Calc's, so the app with the better star average is not the one people write more warmly about.

Voltage Divider ships an update every 48 months, 555 Calc every 20 months. The most recent releases landed on June 23, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | Voltage Divider | 555 Calc |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [2.7 (3 ratings)](https://appshunter.io/ios/app/voltage-divider/id372094728/reviews) | **[4.0 (3 ratings)](https://appshunter.io/ios/app/555-calc/id868058244/reviews)** |
| Number of ratings | 3 | 3 |
| Positive reviews | **55.6% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 48 months | **Every 20 months** |
| Monetization | Paid | **Ad-supported** |
| Size | 1 MB | 18 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ditty Labs, LLC](https://appshunter.io/developer/420813089) | [Jibiki Works](https://appshunter.io/developer/556845808) |

## What reviewers say

### Voltage Divider

[App page](https://appshunter.io/ios/app/voltage-divider/id372094728)

This engineering utility calculates unknown values in a voltage divider circuit. It can solve for voltages or resistor values, displaying ideal and actual resistor options. It also shows current, power, and voltage tolerance.

**Highlights:** Solves for Vin, Vout, R1, or R2, Resistor picker with actual values, Displays ideal resistor value, Calculates voltage tolerance, Shows current and power consumption

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Voltage Divider free?

Voltage Divider costs $1.99, with no in-app purchases.

### Is 555 Calc free?

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

### Which has better reviews, Voltage Divider or 555 Calc?

555 Calc is rated higher. Voltage Divider averages 2.7 out of 5 from 3 ratings, while 555 Calc averages 4.0 from 3 ratings.

### Do Voltage Divider or 555 Calc have ads?

555 Calc shows ads; Voltage Divider does not.

### Which is updated more often, Voltage Divider or 555 Calc?

Voltage Divider ships an update every 48 months, and 555 Calc every 20 months. Most recently, Voltage Divider was updated on June 23, 2026 and 555 Calc on June 1, 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.*