Square Stacker vs 21
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Square Stacker
This game blends Match 3 and Tic Tac Toe mechanics with colorful squares. Match three of the same color in a row, column, or stack to clear them. Strategize to achieve the highest score before the screen fills up.
- Match 3 and Tic Tac Toe mechanics
- Color matching puzzles
- Stacking gameplay
- Strategy and planning
- High score tracking
- HD quality graphics
Read full descriptionHide full description
In case you have ever wondered what it would be like if someone threw a Match 3 Game and Tic Tac Toe together in a cooking pot, added some bright colors and then made an app out if it, here you go. Square Stacker is the colorful result and a matching game unlike most others. The rules are basically the same as in any Match 3 game or as in Tic Tac Toe. You have to combine the same color three times to make the squares disappear. But in this case you can match the colors in a row, in a column or - and that’s new - in a stack. That means if you stack three same colored squares in one spot, it will disappear as well. But since there are not only different colors, but also different sizes of squares, let’s take a look at the rules: 1. Rows and Columns Match three squares of the same color in a row or column. The sizes don’t matter and neither do the other colors in the same row. This means you can match a small orange square surrounded by two bigger squares of a different color with two other orange squares in this row, no matter in which position they are in the stack. 2. Stacks The other option of combining 3 colors is a stack. To make a stack disappear you have to place the same color three times in the same spot. If you build a stack out of a small, medium and large square in the same color you have build a so called full stack and it will disappear from the screen. The basic rules are simple as you can see. However it takes a bit of strategy, planning and wits to reach the highest score here. If there is no more room on the screen to add a new stack, the game is over and you will receive a score. 3 in a row is a game played by generations of people, and with Square Stacker it has been elevated to a new level of fun. Stack the squares, match the colors, double the fun! Features: - Match 3 and Tic Tac Toe combined - A fun strategy game - Highscores - For Adults and Kids - HD quality
21
Read full descriptionHide full description
Hit 21. Don't bust. Claim falling cards, stack smart, and clear every slot. Easy to learn, impossible to master.
Screenshots
Verdict
The clearest difference is iOS requirement: Square Stacker at 13.0 against 21's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Square Stacker ships an update every 3 days, 21 every 2 days. The most recent releases landed on June 1, 2026 and September 19, 2026 respectively.
| Parameter | Square Stacker | 21 |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 3 days | Every 2 days — better |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 13.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 33 MB | 39 MB |
| Age rating | 4+ | 4+ |
| Developer | Famobi GmbH | Chee Hoong Khor |
In-app purchases
Square Stacker
No in-app purchases
21
No in-app purchases
