# Flippy the Train vs One Line

The clearest difference is in-app purchases: Flippy the Train at none against One Line's 1. Flippy the Train also leads on iOS requirement (13.0 vs 17.0). One Line's advantage is update cadence (every 2 months vs every 6 months). On price, ads and device support there is nothing between them.

Both are free to download. One Line sells 1 one-off in-app purchase. Flippy the Train asks for nothing beyond the download.

Flippy the Train ships an update every 6 months, One Line every 2 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Flippy the Train | One Line |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/flippy-the-train/id957889052/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 3 MB | 1 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Karl Voskuil](https://appshunter.io/developer/957889051) | [torankirite](https://appshunter.io/developer/1883564850) |

## What reviewers say

### Flippy the Train

[App page](https://appshunter.io/ios/app/flippy-the-train/id957889052)

Solve digital circuitry puzzles by building train tracks that model logic gates like NOT, AND, and OR. Challenge yourself to create complex circuits such as XOR gates and half-adders with minimal track segments. Explore a sandbox mode for freeform track creation.

**Highlights:** Digital circuitry puzzles, Logic gate simulation (NOT, AND, OR, XOR), Half-adder circuit challenges, Sandbox mode for track creation, Minimal track segment challenges

**Features:** macOS Compatibility

**In-app purchases:** none


### One Line

[App page](https://appshunter.io/ios/app/one-line-number-path-puzzle/id6787843651)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $4.99 | one-time |


## Frequently asked questions

### Is Flippy the Train free?

Flippy the Train is free to download, with no in-app purchases.

### Is One Line free?

One Line is free to download, with in-app purchases available.

### Do Flippy the Train or One Line have ads?

Neither Flippy the Train nor One Line shows ads.

### Which is updated more often, Flippy the Train or One Line?

Flippy the Train ships an update every 6 months, and One Line every 2 months. Most recently, Flippy the Train was updated on October 24, 2026 and One Line on October 25, 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.*