# Timer 555 Calculator vs Bode Plot

The clearest difference is in-app purchases: Bode Plot at none against Timer 555 Calculator's 1. Timer 555 Calculator's advantage is iOS requirement (13.2 vs 26.2). On price, update cadence, ads and device support there is nothing between them.

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

Timer 555 Calculator ships an update every 3 months, Bode Plot every 5 months. The most recent releases landed on September 24, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Timer 555 Calculator | Bode Plot |
| --- | --- | --- |
| 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 | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 5 months |
| Monetization | Free with in-app purchases | — |
| Size | 3 MB | 1 MB |
| Requires iOS | **13.2** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [Yuta Nishimatsu](https://appshunter.io/developer/1480004995) |

## 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 |


### Bode Plot

[App page](https://appshunter.io/ios/app/bode-plot/id6756905343)

**Features:** macOS Compatibility

**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 Bode Plot free?

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

### Do Timer 555 Calculator or Bode Plot have ads?

Neither Timer 555 Calculator nor Bode Plot shows ads.

### Which is updated more often, Timer 555 Calculator or Bode Plot?

Timer 555 Calculator ships an update every 3 months, and Bode Plot every 5 months. Most recently, Timer 555 Calculator was updated on September 24, 2026 and Bode Plot on September 9, 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.*