# Timer 555 Calculator vs Electronic Component Codes

The clearest difference is review sentiment: Timer 555 Calculator at 100% against Electronic Component Codes's 0%. Timer 555 Calculator also leads on ads (none vs shown) and iOS requirement (13.2 vs 16.0). Electronic Component Codes's advantage is in-app purchases (none vs 1) and update cadence (every 6 weeks vs every 3 months). On price and device support there is nothing between them.

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

Timer 555 Calculator ships an update every 3 months, Electronic Component Codes every 6 weeks. The most recent releases landed on September 24, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Timer 555 Calculator | Electronic Component Codes |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (8 ratings)](https://appshunter.io/ios/app/timer-555-calculator/id834044557/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 6 weeks** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 3 MB | 9 MB |
| Requires iOS | **13.2** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [ALG Software Lab](https://appshunter.io/developer/1650561236) |

## 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 |


### Electronic Component Codes

[App page](https://appshunter.io/ios/app/electronic-component-codes/id1670579756)

Quickly identify electronic component values using color codes and SMD markings. This utility supports resistors, capacitors, and inductors, offering detailed explanations and standard value charts.

**Highlights:** Resistor color code calculator, SMD resistor code lookup, Capacitor code identification, Inductor color code guide, E-series value charts, Detailed help sections

**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 Electronic Component Codes free?

Electronic Component Codes is free to download, with no in-app purchases.

### Do Timer 555 Calculator or Electronic Component Codes have ads?

Electronic Component Codes shows ads; Timer 555 Calculator does not.

### Which is updated more often, Timer 555 Calculator or Electronic Component Codes?

Timer 555 Calculator ships an update every 3 months, and Electronic Component Codes every 6 weeks. Most recently, Timer 555 Calculator was updated on September 24, 2026 and Electronic Component Codes on September 16, 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.*