# Traffic Lights simulator vs Flash Knot

The clearest difference is update cadence: Flash Knot at every 9 days against Traffic Lights simulator's every 17 months. On price, ads, 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.

Traffic Lights simulator ships an update every 17 months, Flash Knot every 9 days. The most recent releases landed on October 13, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Traffic Lights simulator | Flash Knot |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (12 ratings)](https://appshunter.io/ios/app/traffic-lights-simulator/id6738129756/reviews)** | — |
| Number of ratings | **12** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 17 months | **Every 9 days** |
| Monetization | Ad-supported | — |
| Size | 79 MB | 50 MB |
| Requires iOS | **13** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Yan Koev](https://appshunter.io/developer/1777231607) | [思缘 曾](https://appshunter.io/developer/1856258158) |

## What reviewers say

### Traffic Lights simulator

[App page](https://appshunter.io/ios/app/traffic-lights-simulator/id6738129756)

Design and control traffic light systems on your mobile device. Customize light types, colors, and timing for car, bicycle, pedestrian, and even animal crossings. Simulate traffic flow and resolve congestion issues.

**Highlights:** Customize traffic light modules (1x1 to 3x3), Choose light types (car, bike, pedestrian, animals), Set custom light colors, Adjust light switching times, Add independent timelines, Simulate traffic flow and adjust positions

**Features:** macOS Compatibility

**In-app purchases:** none


### Flash Knot

[App page](https://appshunter.io/ios/app/flash-knot/id6755921135)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Traffic Lights simulator free?

Traffic Lights simulator is free to download, with no in-app purchases.

### Is Flash Knot free?

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

### Do Traffic Lights simulator or Flash Knot have ads?

Both Traffic Lights simulator and Flash Knot show ads.

### Which is updated more often, Traffic Lights simulator or Flash Knot?

Traffic Lights simulator ships an update every 17 months, and Flash Knot every 9 days. Most recently, Traffic Lights simulator was updated on October 13, 2026 and Flash Knot on September 18, 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.*