# Solid Line vs Bullet Engineer

The clearest difference is update cadence: Bullet Engineer at weekly against Solid Line's every 3 weeks. Solid Line's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 18.6). On price, ads and in-app purchases there is nothing between them.

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

Solid Line ships an update every 3 weeks, Bullet Engineer weekly. The most recent releases landed on October 3, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | Solid Line | Bullet Engineer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/solid-line/id6759250904/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | Ad-supported | — |
| Size | 190 MB | 11 MB |
| Requires iOS | **15.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [DK Bilgi Teknolojileri](https://appshunter.io/developer/1510149782) | [Ibrahim Al-Dossrai](https://appshunter.io/developer/6788150418) |

## What reviewers say

### Solid Line

[App page](https://appshunter.io/ios/app/solid-line/id6759250904)

Arrange cards by color and sequence to clear the game board. A simple yet engaging puzzle experience.

**Highlights:** Card stacking gameplay, Color matching, Sequence ordering, Board clearing mechanics, Puzzle solving

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

**In-app purchases:** none


### Bullet Engineer

[App page](https://appshunter.io/ios/app/bullet-engineer/id6788150416)

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

**In-app purchases:** none


## Frequently asked questions

### Is Solid Line free?

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

### Is Bullet Engineer free?

Bullet Engineer is free to download, with no in-app purchases.

### Do Solid Line or Bullet Engineer have ads?

Both Solid Line and Bullet Engineer show ads.

### Which is updated more often, Solid Line or Bullet Engineer?

Solid Line ships an update every 3 weeks, and Bullet Engineer weekly. Most recently, Solid Line was updated on October 3, 2026 and Bullet Engineer on September 26, 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.*