# EDGE21 vs Submarine

The clearest difference is in-app purchases: EDGE21 at none against Submarine's 4. EDGE21 also leads on iOS requirement (15.1 vs 17.6). Submarine's advantage is update cadence (every 4 days vs fortnightly). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Submarine sells 4 one-off in-app purchases. EDGE21 asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for EDGE21 against 5.0 for Submarine. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

EDGE21 ships an update fortnightly, Submarine every 4 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | EDGE21 | Submarine |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/edge21/id6757775188/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/submarine-reef-pilot/id6789714045/reviews) |
| Number of ratings | 2 | 2 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 4 days** |
| Monetization | Free | Free |
| Size | 24 MB | 19 MB |
| Requires iOS | **15.1** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Mark Baumrind](https://appshunter.io/developer/1868868237) | [MooreDev Technologies LLC](https://appshunter.io/developer/6785042969) |

## What reviewers say

### EDGE21

[App page](https://appshunter.io/ios/app/edge21/id6757775188)

Master blackjack strategy with this educational tool. Learn basic strategy, practice card counting, and identify mistakes with detailed explanations and engaging game modes. Designed for entertainment and skill improvement.

**Highlights:** Learn Basic Strategy, Speedrun Mode, Boss Hand Mode, Card Counting Practice, Mistake Identification, Detailed Explanations

**Features:** macOS Compatibility

**In-app purchases:** none


### Submarine

[App page](https://appshunter.io/ios/app/submarine-reef-pilot/id6789714045)

Pilot a submarine through vibrant underwater worlds, dodging hazards like torpedoes and mines. Collect coins to unlock new submarines and power-ups. Compete globally on leaderboards for the longest survival time.

**Highlights:** Touch and drag steering, Three lives per run, Collect coins and treasure, Unlock 12 unique submarines, Power-ups like shields and magnets, Global leaderboards, Offline play

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1,000 Coins | $0.99 | one-time |
| 5,000 Coins | $2.99 | one-time |
| 15,000 Coins | $4.99 | one-time |
| 50,000 Coins | $9.99 | one-time |


## Frequently asked questions

### Is EDGE21 free?

EDGE21 is free to download, with no in-app purchases.

### Is Submarine free?

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

### Which has better reviews, EDGE21 or Submarine?

EDGE21 and Submarine are both rated 5.0 out of 5 on the App Store, from 2 and 2 ratings respectively.

### Do EDGE21 or Submarine have ads?

Neither EDGE21 nor Submarine shows ads.

### Which is updated more often, EDGE21 or Submarine?

EDGE21 ships an update fortnightly, and Submarine every 4 days. Most recently, EDGE21 was updated on October 31, 2026 and Submarine on October 31, 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.*