# One Line vs Tower Builder

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

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

One Line ships an update every 6 months, Tower Builder weekly. The most recent releases landed on November 9, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | One Line | Tower Builder |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (1 ratings)](https://appshunter.io/ios/app/tower-builder-earthquake-sim/id6799890597/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 54 MB | 74 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nagy Solaiman](https://appshunter.io/developer/6809016106) | [AXIAL MUHENDISLIK VE YAZILIM LIMITED SIRKETI](https://appshunter.io/developer/6799890839) |

## What reviewers say

### One Line

[App page](https://appshunter.io/ios/app/one-line-one-stroke-puzzle/id6763643669)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Tower Builder

[App page](https://appshunter.io/ios/app/tower-builder-earthquake-sim/id6799890597)

Design and build structures like towers, cranes, and bridges using various materials. Test their resilience against simulated earthquakes of up to magnitude 10, or engage in demolition challenges. Grow your construction company by upgrading factories and unlocking new materials.

**Highlights:** Physics-based building simulation, Multiple construction materials, Earthquake simulation up to magnitude 10, Building demolition mode, Construction company growth, Offline play

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


## Frequently asked questions

### Is One Line free?

One Line is free to download, with no in-app purchases.

### Is Tower Builder free?

Tower Builder is free to download, with in-app purchases available.

### Do One Line or Tower Builder have ads?

Tower Builder shows ads; One Line does not.

### Which is updated more often, One Line or Tower Builder?

One Line ships an update every 6 months, and Tower Builder weekly. Most recently, One Line was updated on November 9, 2026 and Tower Builder on November 10, 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.*