# Diode LED circuit vs Perfect Echo

The clearest difference is ads: Diode LED circuit at none against Perfect Echo's shown. Perfect Echo's advantage is iOS requirement (12.0 vs 15.0). On price, update cadence, in-app purchases and device support there is nothing between them.

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

Diode LED circuit ships an update every 24 months, Perfect Echo every 35 months. The most recent releases landed on October 11, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Diode LED circuit | Perfect Echo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (2 ratings)](https://appshunter.io/ios/app/diode-led-circuit/id1457885821/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 24 months** | Every 35 months |
| Monetization | Free | — |
| Size | 10 MB | 41 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [yasin dewid](https://appshunter.io/developer/1368617865) | [Marco Andreotti](https://appshunter.io/developer/1514019597) |

## What reviewers say

### Diode LED circuit

[App page](https://appshunter.io/ios/app/diode-led-circuit/id1457885821)

Connect wires to a battery to power all the diodes in this electric puzzle game. Rotate wires to create a complete circuit and light up every LED in the shortest time. Offers four difficulty levels for a challenging experience.

**Highlights:** Connect wires to power LEDs, Rotate wires for circuit completion, Four difficulty levels, Shortest time challenge, Circuit simulation gameplay

**Features:** Vision Pro support

**In-app purchases:** none


### Perfect Echo

[App page](https://appshunter.io/ios/app/perfect-echo/id1544980146)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Diode LED circuit free?

Diode LED circuit is free to download, with no in-app purchases.

### Is Perfect Echo free?

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

### Do Diode LED circuit or Perfect Echo have ads?

Perfect Echo shows ads; Diode LED circuit does not.

### Which is updated more often, Diode LED circuit or Perfect Echo?

Diode LED circuit ships an update every 24 months, and Perfect Echo every 35 months. Most recently, Diode LED circuit was updated on October 11, 2026 and Perfect Echo on October 14, 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.*