# Slitherlink vs Prime Merge

The clearest difference is in-app purchases: Prime Merge at none against Slitherlink's 13. Prime Merge also leads on update cadence (every 4 days vs every 4 months). Slitherlink's advantage is ads (none vs shown) and iOS requirement (15.6 vs 26.2). On price and device support there is nothing between them.

Both are free to download. Slitherlink sells 13 one-off in-app purchases. Prime Merge asks for nothing beyond the download.

Slitherlink ships an update every 4 months, Prime Merge every 4 days. The most recent releases landed on October 26, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Slitherlink | Prime Merge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (461 ratings)](https://appshunter.io/ios/app/slitherlink-loop-the-snake/id605918324/reviews)** | — |
| Number of ratings | **461** | — |
| Positive reviews | 89.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 7 MB | 5 MB |
| Requires iOS | **15.6** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Conceptis Ltd.](https://appshunter.io/developer/479420055) | [ryuya matsuo](https://appshunter.io/developer/1841066123) |

## What reviewers say

### Slitherlink

[App page](https://appshunter.io/ios/app/slitherlink-loop-the-snake/id605918324)

Solve logic puzzles by drawing a single loop around clues on a grid. Connect dots to form a continuous line, with no crossings or branches. Offers endless fun and intellectual challenge for puzzle enthusiasts.

**Highlights:** Draw a single continuous loop, Surround numbered clues, Pure logic, no math required, Weekly bonus puzzles, Multiple difficulty levels, Auto complete clues, Highlight link segment

**Features:** Family Sharing, Vision Pro support

**In-app purchases (13)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Medium Snacks 1 | $0.99 | one-time |
| Easy Variety 1 | $1.99 | one-time |
| Easy Variety - Large 1 | $1.99 | one-time |
| Medium Variety 1 | $1.99 | one-time |
| Medium Variety - Large 1 | $1.99 | one-time |
| Hard Variety 1 | $1.99 | one-time |
| Easy Variety 2 | $1.99 | one-time |
| Medium Variety 2 | $1.99 | one-time |
| Hard Variety 2 | $1.99 | one-time |
| Big & Easy 1 | $1.99 | one-time |
| Big & Medium 1 | $1.99 | one-time |
| Hard Variety - Large 1 | $1.99 | one-time |
| Big & Tough 1 | $1.99 | one-time |

**What reviewers like**

- 🎉 Challenging and fun puzzles
- 👍 Well-designed and intuitive interface
- 🔍 Helpful check and undo features
- 💡 Variety of puzzle sizes and difficulty levels
- 🧠 Requires logical thinking

**What reviewers complain about**

- 🔍 Lack of coloring/marking tools to differentiate loop segments
- 💰 Expensive puzzle pack prices
- 🌙 No dark mode option
- 🐛 Occasional bugs and crashes
- 🔍 Limited free puzzle content

**Reported bugs**

- App not loading properly for some users
- Freezing issues on login screen
- Incompatibility with older devices

**Requested features**

- Add a dark mode option
- Implement coloring/marking tools for loop segments
- Provide more free puzzle content
- Reduce pricing for puzzle packs
- Add a rewind/undo feature to go back to previous puzzle states


### Prime Merge

[App page](https://appshunter.io/ios/app/prime-merge/id6792428586)

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

**In-app purchases:** none


## Frequently asked questions

### Is Slitherlink free?

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

### Is Prime Merge free?

Prime Merge is free to download, with no in-app purchases.

### Do Slitherlink or Prime Merge have ads?

Prime Merge shows ads; Slitherlink does not.

### Which is updated more often, Slitherlink or Prime Merge?

Slitherlink ships an update every 4 months, and Prime Merge every 4 days. Most recently, Slitherlink was updated on October 26, 2026 and Prime Merge on October 8, 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.*