# Blue Crystal Ball vs Abyss

The clearest difference is in-app purchases: Blue Crystal Ball at none against Abyss's 2. Blue Crystal Ball also leads on iOS requirement (12.0 vs 15.2). Abyss's advantage is ads (none vs shown) and update cadence (every 10 months vs every 72 months). On price and device support there is nothing between them.

Both are free to download. Abyss sells 2 one-off in-app purchases. Blue Crystal Ball asks for nothing beyond the download.

Blue Crystal Ball ships an update every 72 months, Abyss every 10 months. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Blue Crystal Ball | Abyss |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 72 months | **Every 10 months** |
| Size | 57 MB | 7 MB |
| Requires iOS | **12.0** | 15.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Aleksa Racovic](https://appshunter.io/developer/1255649501) | [Claudio Robledo](https://appshunter.io/developer/1539364851) |

## What reviewers say

### Blue Crystal Ball

[App page](https://appshunter.io/ios/app/blue-crystal-ball-block-it/id1321605281)

**Features:** macOS Compatibility

**In-app purchases:** none


### Abyss

[App page](https://appshunter.io/ios/app/abyss-master-skill/id1539367921)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |
| Submarine Skin Pack | $1.99 | one-time |


## Frequently asked questions

### Is Blue Crystal Ball free?

Blue Crystal Ball is free to download, with no in-app purchases.

### Is Abyss free?

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

### Do Blue Crystal Ball or Abyss have ads?

Blue Crystal Ball shows ads; Abyss does not.

### Which is updated more often, Blue Crystal Ball or Abyss?

Blue Crystal Ball ships an update every 72 months, and Abyss every 10 months. Most recently, Blue Crystal Ball was updated on October 26, 2026 and Abyss on October 27, 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.*