# 555 Calc vs Voltage Divider Calculator

The clearest difference is rating: 555 Calc at 4.0 against Voltage Divider Calculator's 3.3. 555 Calc also leads on iOS requirement (11.0 vs 17.6). Voltage Divider Calculator's advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, ratings volume, update cadence and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

555 Calc holds the better App Store score, 4.0 against 3.3. Both are backed by a comparable volume of ratings — 3 and 3 respectively.

555 Calc ships an update every 20 months, Voltage Divider Calculator every 11 months. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | 555 Calc | Voltage Divider Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (3 ratings)](https://appshunter.io/ios/app/555-calc/id868058244/reviews)** | [3.3 (3 ratings)](https://appshunter.io/ios/app/voltage-divider-calculator/id6505137107/reviews) |
| Number of ratings | 3 | 3 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 20 months | **Every 11 months** |
| Monetization | Ad-supported | **Free** |
| Size | 18 MB | 9 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) | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) |

## 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


### Voltage Divider Calculator

[App page](https://appshunter.io/ios/app/voltage-divider-calculator/id6505137107)

Calculate unknown values in voltage divider circuits with ease. Supports loaded dividers, power dissipation calculations, and finding standard resistor values. Ideal for students, hobbyists, and engineers.

**Highlights:** Calculate Vin, Vout, R1, R2, Support for loaded dividers (RL), Power dissipation calculation (P(R1), P(R2)), Find nearest standard E24 resistor values, Supports Ohms and Kilo-Ohms, Instant results as you type

**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 Voltage Divider Calculator free?

Voltage Divider Calculator is free to download, with no in-app purchases.

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

555 Calc is rated higher. 555 Calc averages 4.0 out of 5 from 3 ratings, while Voltage Divider Calculator averages 3.3 from 3 ratings.

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

555 Calc shows ads; Voltage Divider Calculator does not.

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

555 Calc ships an update every 20 months, and Voltage Divider Calculator every 11 months. Most recently, 555 Calc was updated on November 1, 2026 and Voltage Divider Calculator on November 4, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*