# Slitherlink vs Pi 100 Challenge

The clearest difference is price: Slitherlink at Free against Pi 100 Challenge's $0.99. Slitherlink also leads on iOS requirement (15.6 vs 17.0). Pi 100 Challenge's advantage is in-app purchases (none vs 13) and update cadence (every 3 weeks vs every 4 months). On ads and device support there is nothing between them.

Slitherlink is free to download; Pi 100 Challenge costs $0.99 up front. Slitherlink sells 13 one-off in-app purchases. Pi 100 Challenge asks for nothing beyond the download.

Slitherlink ships an update every 4 months, Pi 100 Challenge every 3 weeks. The most recent releases landed on October 19, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Slitherlink | Pi 100 Challenge |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.8 (457 ratings)](https://appshunter.io/ios/app/slitherlink-loop-the-snake/id605918324/reviews)** | — |
| Number of ratings | **457** | — |
| Positive reviews | 89.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 7 MB | 11 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Conceptis Ltd.](https://appshunter.io/developer/479420055) | [Ram Rao](https://appshunter.io/developer/1724828937) |

## 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


### Pi 100 Challenge

[App page](https://appshunter.io/ios/app/pi-100-challenge/id6475694538)

**In-app purchases:** none


## Frequently asked questions

### Is Slitherlink free?

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

### Is Pi 100 Challenge free?

Pi 100 Challenge costs $0.99, with no in-app purchases.

### Do Slitherlink or Pi 100 Challenge have ads?

Neither Slitherlink nor Pi 100 Challenge shows ads.

### Which is updated more often, Slitherlink or Pi 100 Challenge?

Slitherlink ships an update every 4 months, and Pi 100 Challenge every 3 weeks. Most recently, Slitherlink was updated on October 19, 2026 and Pi 100 Challenge on October 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.*