# Timer 555 Calculator vs Electrical Series Calculator

The clearest difference is rating: Electrical Series Calculator at 4.5 against Timer 555 Calculator's 3.9. Electrical Series Calculator also leads on in-app purchases (none vs 1). Timer 555 Calculator's advantage is ads (none vs shown) and update cadence (every 3 months vs every 8 months). On price, ratings volume and device support there is nothing between them.

Both are free to download. Timer 555 Calculator sells 1 one-off in-app purchase. Electrical Series Calculator asks for nothing beyond the download.

Electrical Series Calculator holds the better App Store score, 4.5 against 3.9. Both are backed by a comparable volume of ratings — 8 and 13 respectively.

Timer 555 Calculator ships an update every 3 months, Electrical Series Calculator every 8 months. The most recent releases landed on October 21, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Timer 555 Calculator | Electrical Series Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (8 ratings)](https://appshunter.io/ios/app/timer-555-calculator/id834044557/reviews) | **[4.5 (13 ratings)](https://appshunter.io/ios/app/electrical-series-calculator/id967967501/reviews)** |
| Number of ratings | 8 | **13** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 3 months** | Every 8 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 3 MB | 39 MB |
| Requires iOS | **13.2** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) |

## What reviewers say

### Timer 555 Calculator

[App page](https://appshunter.io/ios/app/timer-555-calculator/id834044557)

Calculate monostable and astable circuits for electronics projects. Determine pulse width and frequency, find component combinations, and save/upload data. Supports multiple languages.

**Highlights:** Monostable circuit pulse width calculation, Astable circuit frequency calculation, Component combination finder, Save component values to CSV, Upload CSV via AirDrop/iCloud Drive, Multi-language support

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Pro feature | $0.99 | one-time |


### Electrical Series Calculator

[App page](https://appshunter.io/ios/app/electrical-series-calculator/id967967501)

This application simplifies electrical series calculations for resistance, inductance, and capacitance. It supports multiple units for flexible input and output, making complex computations quick and effortless for users.

**Highlights:** Resistance series calculation, Inductance series calculation, Capacitance series calculation, Supports multiple units (Ohms, KiloOhms, Farads, etc.), User-friendly interface, Calculations for series circuits

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Timer 555 Calculator free?

Timer 555 Calculator is free to download, with in-app purchases available.

### Is Electrical Series Calculator free?

Electrical Series Calculator is free to download, with no in-app purchases.

### Which has better reviews, Timer 555 Calculator or Electrical Series Calculator?

Electrical Series Calculator is rated higher. Timer 555 Calculator averages 3.9 out of 5 from 8 ratings, while Electrical Series Calculator averages 4.5 from 13 ratings.

### Do Timer 555 Calculator or Electrical Series Calculator have ads?

Electrical Series Calculator shows ads; Timer 555 Calculator does not.

### Which is updated more often, Timer 555 Calculator or Electrical Series Calculator?

Timer 555 Calculator ships an update every 3 months, and Electrical Series Calculator every 8 months. Most recently, Timer 555 Calculator was updated on October 21, 2026 and Electrical Series Calculator on October 28, 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.*