# Fill vs Einstein Challenge

The clearest difference is price: Fill at Free against Einstein Challenge's $0.99. Fill also leads on update cadence (every 3 months vs every 39 months) and iOS requirement (15.6 vs 17.0). Einstein Challenge's advantage is in-app purchases (none vs 10). On device support there is nothing between them.

Fill is free to download; Einstein Challenge costs $0.99 up front. Fill sells 10 one-off in-app purchases. Einstein Challenge asks for nothing beyond the download.

Fill ships an update every 3 months, Einstein Challenge every 39 months. The most recent releases landed on October 26, 2026 and May 16, 2026 respectively.

## The numbers

| Metric | Fill | Einstein Challenge |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.8 (1.2K ratings)](https://appshunter.io/ios/app/fill-a-pix-minesweeper-puzzle/id479420052/reviews)** | — |
| Number of ratings | **1.2K** | — |
| Positive reviews | 91.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | — |
| Update frequency | **Every 3 months** | Every 39 months |
| Monetization | Free with in-app purchases | — |
| Size | 7 MB | 9 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Conceptis Ltd.](https://appshunter.io/developer/479420055) | [Joao Silva](https://appshunter.io/developer/1293675690) |

## What reviewers say

### Fill

[App page](https://appshunter.io/ios/app/fill-a-pix-minesweeper-puzzle/id479420052)

Uncover hidden pixel art by painting squares based on numerical clues. This logic puzzle game offers a mentally stimulating challenge with a unique fingertip cursor for precise control and a smart-fill option for rapid completion. Enjoy hours of artistic and deductive fun with manually created, high-quality puzzles.

**Highlights:** Reveal hidden pixel art, Deductive logic puzzles, Unique fingertip cursor, Smart-fill cursor, Weekly bonus puzzles, Manually created puzzles

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic Logic - Variety 1 | $2.99 | one-time |
| Advanced Logic - Variety 1 | $2.99 | one-time |
| Basic Logic - Variety 2 | $2.99 | one-time |
| Basic Logic - Variety 3 | $2.99 | one-time |
| Advanced Logic - Variety Large | $3.99 | one-time |
| Basic Logic - Variety Large | $3.99 | one-time |
| Basic Logic - Variety Large 2 | $3.99 | one-time |
| Basic Logic - Extra Large 1 | $4.99 | one-time |
| Basic Logic - Extra Large 2 | $4.99 | one-time |
| Basic Logic - Famous Paintings | $4.99 | one-time |

**What reviewers like**

- 👍 Enjoyable and challenging puzzles
- 👍 Clean and intuitive interface
- 👍 No ads
- 👍 Variety of difficulty levels
- 👍 Relaxing and stress-relieving

**What reviewers complain about**

- 💰 Puzzle packs are expensive
- 🐛 Occasional crashes or bugs
- 🔍 Difficulty finding remaining unmarked tiles
- 🔍 Accidental tile selection when zooming/panning
- 🔍 Lack of color in puzzles

**Reported bugs**

- Puzzle progress not saving properly
- Incompatibility issues with newer iOS versions
- Freezing or crashing when using certain features

**Requested features**

- Add a hint feature to help with difficult puzzles
- Introduce more free puzzle packs or a daily free puzzle
- Allow saving/restoring of purchased puzzle packs
- Add an option to highlight empty/unmarked areas
- Provide a 'test' mode to try out moves without committing


### Einstein Challenge

[App page](https://appshunter.io/ios/app/einstein-challenge/id1293675691)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Fill free?

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

### Is Einstein Challenge free?

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

### Which is updated more often, Fill or Einstein Challenge?

Fill ships an update every 3 months, and Einstein Challenge every 39 months. Most recently, Fill was updated on October 26, 2026 and Einstein Challenge on May 16, 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.*