# DigiCompCalc vs 555 Calc

The clearest difference is review sentiment: DigiCompCalc at 100% against 555 Calc's 50%. DigiCompCalc also leads on rating (5.0 vs 4.0) and ads (none vs shown). 555 Calc's advantage is update cadence (every 20 months vs every 68 months) and device support (3 vs 1). On price, ratings volume 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.

DigiCompCalc holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 2 and 3 respectively. Written reviews point the same way: 100% of DigiCompCalc's written reviews are positive against 50% of 555 Calc's.

DigiCompCalc ships an update every 68 months, 555 Calc every 20 months. The most recent releases landed on October 5, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | DigiCompCalc | 555 Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/digicompcalc/id559620424/reviews)** | [4.0 (3 ratings)](https://appshunter.io/ios/app/555-calc/id868058244/reviews) |
| Number of ratings | 2 | **3** |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 68 months | **Every 20 months** |
| Monetization | **Free** | Ad-supported |
| Size | 1 MB | 18 MB |
| Requires iOS | 16.0 | **11.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ernie Zappacosta](https://appshunter.io/developer/509385502) | [Jibiki Works](https://appshunter.io/developer/556845808) |

## What reviewers say

### DigiCompCalc

[App page](https://appshunter.io/ios/app/digicompcalc/id559620424)

This utility app simplifies digital power compensator coefficient calculations. It allows users to input data and obtain results directly on their mobile device, eliminating the need for complex desktop software. Results can be emailed for easy sharing.

**Highlights:** Calculate coefficients from analog compensator values, Calculate coefficients directly using poles and zeros, Email results, Remembers last calculated variables, Dark Mode support

**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 DigiCompCalc free?

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

### Is 555 Calc free?

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

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

DigiCompCalc is rated higher. DigiCompCalc averages 5.0 out of 5 from 2 ratings, while 555 Calc averages 4.0 from 3 ratings.

### Do DigiCompCalc or 555 Calc have ads?

555 Calc shows ads; DigiCompCalc does not.

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

DigiCompCalc ships an update every 68 months, and 555 Calc every 20 months. Most recently, DigiCompCalc was updated on October 5, 2026 and 555 Calc on September 27, 2026.

---

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