# PolyFill vs X Lines

The clearest difference is rating: X Lines at 5.0 against PolyFill's 2.3. X Lines also leads on ads (none vs shown) and update cadence (every 6 days vs every 6 months). On price, ratings volume, in-app purchases and device support there is nothing between them.

Both are free to download. PolyFill sells 3 one-off in-app purchases and X Lines sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

X Lines holds the better App Store score, 5.0 against 2.3. Both are backed by a comparable volume of ratings — 3 and 2 respectively.

PolyFill ships an update every 6 months, X Lines every 6 days. The most recent releases landed on October 6, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | PolyFill | X Lines |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.3 (3 ratings)](https://appshunter.io/ios/app/polyfill/id987147033/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/x-lines/id1387718873/reviews)** |
| Number of ratings | **3** | 2 |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 6 months | **Every 6 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 15 MB | 11 MB |
| Requires iOS | 14.0 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Kelly Technology Inc.](https://appshunter.io/developer/393931941) | [景灯 梁](https://appshunter.io/developer/977915723) |

## What reviewers say

### PolyFill

[App page](https://appshunter.io/ios/app/polyfill/id987147033)

A brain-training puzzle game where you race against the clock to assemble geometric shapes. Earn points based on difficulty and speed, and compete on leaderboards. Unlock additional complexity and scoring through optional in-app purchases.

**Highlights:** Brain-training puzzles, Timed challenges, Geometric shape assembly, Scoring based on difficulty and time, Game Center leaderboards, Achievement awards, In-app purchases for complexity

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ads. | $1.99 | one-time |
| Unlock level 2 | $1.99 | one-time |
| Unlock level 3 | $1.99 | one-time |


### X Lines

[App page](https://appshunter.io/ios/app/x-lines/id1387718873)

This puzzle game challenges your geometric thinking and reasoning skills. Uncross lines by moving nodes to create a clear path. It offers over 200 levels with more planned, suitable for all ages.

**Highlights:** Geometric thinking puzzles, Over 200 levels, Clean UI design, Reasoning and creativity challenges, Supports iPhone and iPad, Suitable for all ages

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

**In-app purchases (1)**

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


## Frequently asked questions

### Is PolyFill free?

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

### Is X Lines free?

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

### Which has better reviews, PolyFill or X Lines?

X Lines is rated higher. PolyFill averages 2.3 out of 5 from 3 ratings, while X Lines averages 5.0 from 2 ratings.

### Do PolyFill or X Lines have ads?

PolyFill shows ads; X Lines does not.

### Which is updated more often, PolyFill or X Lines?

PolyFill ships an update every 6 months, and X Lines every 6 days. Most recently, PolyFill was updated on October 6, 2026 and X Lines on October 2, 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.*