# Mathstack vs Black Hole Galaxy

The clearest difference is iOS requirement: Black Hole Galaxy at 15.0 against Mathstack's 17.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Mathstack sells 3 in-app purchases, starting at $1.99 per 7 days and Black Hole Galaxy sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Mathstack | Black Hole Galaxy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/mathstack-sequence-puzzle/id6748113494/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 11 days | — |
| Monetization | Free with in-app purchases | — |
| Size | 31 MB | 144 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 12+ | 9+ |
| Developer | [Hazerim Interactive Entertainment, UAB](https://appshunter.io/developer/1804702752) | [Luka Lazarashvili](https://appshunter.io/developer/6803771615) |

## What reviewers say

### Mathstack

[App page](https://appshunter.io/ios/app/mathstack-sequence-puzzle/id6748113494)

A unique number puzzle game where you stack cards to form sequences. Strategically use temporary slots to clear the board and uncover hidden cards. Offers three difficulty levels for a tailored challenge.

**Highlights:** Sequence building gameplay, Strategic card stacking, Temporary slot management, Three difficulty levels, Uncover hidden cards

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| No Ads (Weekly) | $1.99 | per 7 days |
| No Ads (Monthly) | $5.99 | per month |
| No Ads (Lifetime) | $19.99 | one-time |


### Black Hole Galaxy

[App page](https://appshunter.io/ios/app/black-hole-galaxy/id6803771613)

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Poison Skin | $0.99 | one-time |
| Plasma Skin | $0.99 | one-time |
| Triangle Skin | $0.99 | one-time |
| Spinner Skin | $0.99 | one-time |
| Trinity Skin | $0.99 | one-time |
| Void Skin | $0.99 | one-time |
| Tempest Skin | $0.99 | one-time |
| Eclipse Skin | $0.99 | one-time |
| Sigil Skin | $0.99 | one-time |
| Sack of Coins | $2.99 | one-time |


## Frequently asked questions

### Is Mathstack free?

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

### Is Black Hole Galaxy free?

Black Hole Galaxy is free to download, with in-app purchases available.

### Do Mathstack or Black Hole Galaxy have ads?

Both Mathstack and Black Hole Galaxy show ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*