# PopStar with Undo vs Chess advisor

The clearest difference is review sentiment: Chess advisor at 100% against PopStar with Undo's 33%. Chess advisor also leads on price (Free vs $4.00) and ads (none vs shown). On in-app purchases and device support there is nothing between them.

Chess advisor is free to download; PopStar with Undo costs $4.00 up front. PopStar with Undo sells 1 one-off in-app purchase and Chess advisor sells 4 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

PopStar with Undo ships an update every 11 months, Chess advisor every 11 days. The most recent releases landed on October 23, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | PopStar with Undo | Chess advisor |
| --- | --- | --- |
| Price | $4.00 | **Free** |
| Rating | **[4.7 (6 ratings)](https://appshunter.io/ios/app/popstar-with-undo/id598512361/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 33.3% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 11 months | **Every 11 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 22 MB | 134 MB |
| Requires iOS | 16.6 | **12.2** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Oscar Tsang](https://appshunter.io/developer/416987065) | [先成 项](https://appshunter.io/developer/1624846153) |

## What reviewers say

### PopStar with Undo

[App page](https://appshunter.io/ios/app/popstar-with-undo/id598512361)

This highly addictive puzzle game offers two distinct modes: Classic, where you clear blocks to meet level targets without a time limit, and Endless, which challenges you to clear as many blocks as possible against the clock. Features include an undo button and customizable block colors.

**Highlights:** Two game modes: Classic and Endless, Tap two or more same-colored blocks, No time limit in Classic mode, Time-based challenges in Endless mode, Undo button, Customizable block colors

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove advertisement | $1.99 | one-time |


### Chess advisor

[App page](https://appshunter.io/ios/app/chess-advisor/id6738571854)

Analyze chess games using a cloud engine and library, or play against it. Connect to third-party platforms to synchronize game situations and quickly improve your chess skills.

**Highlights:** Cloud engine analysis, Cloud library integration, Play against cloud engine, Software chessboard analysis, Third-party platform synchronization

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chess advisor weakly pay | $3.99 | per 7 days |
| Chess advisor monthly pay | $9.99 | per month |
| Chess advisor quarterly pay | $17.99 | per 3 months |
| Chess advisor yearly pay | $49.99 | per year |


## Frequently asked questions

### Is PopStar with Undo free?

PopStar with Undo costs $4.00, and also offers in-app purchases.

### Is Chess advisor free?

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

### Do PopStar with Undo or Chess advisor have ads?

PopStar with Undo shows ads; Chess advisor does not.

### Which is updated more often, PopStar with Undo or Chess advisor?

PopStar with Undo ships an update every 11 months, and Chess advisor every 11 days. Most recently, PopStar with Undo was updated on October 23, 2026 and Chess advisor on October 21, 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.*