# Evolvace E2 vs Ocean Keeper

The clearest difference is price: Ocean Keeper at Free against Evolvace E2's $4.99. Ocean Keeper also leads on update cadence (every 4 days vs every 8 months) and iOS requirement (12.0 vs 15.6). Evolvace E2's advantage is ads (none vs shown). On in-app purchases and device support there is nothing between them.

Ocean Keeper is free to download; Evolvace E2 costs $4.99 up front. Evolvace E2 sells 2 one-off in-app purchases and Ocean Keeper sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Evolvace E2 ships an update every 8 months, Ocean Keeper every 4 days. The most recent releases landed on October 24, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | Evolvace E2 | Ocean Keeper |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | — | **[4.4 (290 ratings)](https://appshunter.io/ios/app/ocean-keeper-dome-survival/id6642704130/reviews)** |
| Number of ratings | — | **290** |
| Positive reviews | — | 48.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 8 months | **Every 4 days** |
| Monetization | — | Free with in-app purchases |
| Size | 87 MB | 272 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 9+ |
| Developer | [Tetsuyoshi Morikawa](https://appshunter.io/developer/430144969) | [RetroStyle Games](https://appshunter.io/developer/346884811) |

## What reviewers say

### Evolvace E2

[App page](https://appshunter.io/ios/app/evolvace-e2/id878635618)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Addition | $0.99 | one-time |
| Stage clear button | $0.99 | one-time |


### Ocean Keeper

[App page](https://appshunter.io/ios/app/ocean-keeper-dome-survival/id6642704130)

Explore procedurally generated underwater caves as a crashed miner in this roguelike shooter. Dig for resources, battle hordes of sea monsters, and upgrade your mech and weapons to survive. Each playthrough offers a unique challenge with changing layouts and diverse bosses.

**Highlights:** Procedurally generated caves, Mech customization, Horde battles with monsters and bosses, Meta-progression system, Artifact system, Multiple weapon choices, Diverse biomes

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Game Unlock | $2.99 | one-time |
| Heap of meta currency | $2.99 | one-time |
| Chest of meta currency | $4.99 | one-time |
| Crate of meta currency | $9.99 | one-time |

**What reviewers like**

- 🫰🏻 Stunning ocean-themed visuals
- 🎮 Engaging roguelike gameplay
- 🕹️ Addictive and fun horde battles
- 🔝 Rewarding resource gathering and crafting
- 🕰️ Casual gameplay for short sessions

**What reviewers complain about**

- 💰 Pay-to-play model after free trial
- 📱 Illegible UI on mobile devices
- 🤑 Unfair IAP practices, requiring repurchase
- 🐛 Bugs and crashes, especially after purchases

**Reported bugs**

- Game not loading after purchase
- Upgrade options not functioning as expected
- Progress not saving across sessions

**Requested features**

- More items and upgrades to prolong engagement
- Ability to restore purchases and continue progress
- Improved UI scaling and readability on mobile
- Expanded gameplay modes and story elements


## Frequently asked questions

### Is Evolvace E2 free?

Evolvace E2 costs $4.99, and also offers in-app purchases.

### Is Ocean Keeper free?

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

### Do Evolvace E2 or Ocean Keeper have ads?

Ocean Keeper shows ads; Evolvace E2 does not.

### Which is updated more often, Evolvace E2 or Ocean Keeper?

Evolvace E2 ships an update every 8 months, and Ocean Keeper every 4 days. Most recently, Evolvace E2 was updated on October 24, 2026 and Ocean Keeper on October 23, 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.*