# Kitty Keep™ vs Underdark

Kitty Keep™ and Underdark both sit at 4.9 stars, but that hides the real split: 96% of Kitty Keep™'s written reviews are positive against 72% of Underdark's. Underdark's advantage is update cadence (every 4 days vs fortnightly) and iOS requirement (13.0 vs 15.0). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Kitty Keep™ sells 32 one-off in-app purchases and Underdark sells 34 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.9 for Kitty Keep™ against 4.8 for Underdark. Both are backed by a comparable volume of ratings — 4.5K and 4K respectively. Written reviews are what separate them: 96% of Kitty Keep™'s written reviews are positive against 72% of Underdark's.

Kitty Keep™ ships an update fortnightly, Underdark every 4 days. Both last shipped on September 24, 2026.

## The numbers

| Metric | Kitty Keep™ | Underdark |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (4.5K ratings)](https://appshunter.io/ios/app/kitty-keep/id6476017989/reviews)** | [4.8 (4K ratings)](https://appshunter.io/ios/app/underdarkdefense/id6482025287/reviews) |
| Number of ratings | **4.5K** | 4K |
| Positive reviews | **95.6% of reviews** | 72.4% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Fortnightly | **Every 4 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 354 MB | 490 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Funovus LLC](https://appshunter.io/developer/1474891913) | [SeungHo Chung](https://appshunter.io/developer/1626940418) |

## What reviewers say

### Kitty Keep™

[App page](https://appshunter.io/ios/app/kitty-keep/id6476017989)

Embark on an offline tower defense adventure featuring adorable cat heroes. Strategize to grow your castle and defend against sea creature invaders using unique cat abilities. Enjoy a blend of idle and TD gameplay with auto-battle rewards.

**Highlights:** Offline tower defense gameplay, Cute cat hero units, Castle growth and upgrades, Idle/Auto-battle rewards, Level up unique cat heroes, Defend against sea creatures

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

**In-app purchases (32)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Hour Auto Battle | $3.99 | one-time |
| Handful of Gold | $3.99 | one-time |
| Pile of Gold | $5.99 | one-time |
| Basic Mine Pack | $5.99 | one-time |
| More Gems | $5.99 | one-time |
| Event Pass | $5.99 | one-time |
| Pouch of Potions | $5.99 | one-time |
| Basic Starter Pack | $5.99 | one-time |
| 50 Gems | $5.99 | one-time |
| Event Starter Pack | $5.99 | one-time |
| Event Hero Pack | $5.99 | one-time |
| Treasure Pile | $5.99 | one-time |
| Offline boost 1 | $5.99 | one-time |
| Event Pass | $9.99 | one-time |
| Treasure Trove | $11.99 | one-time |
| Secret Lab Bundle | $11.99 | one-time |
| 100 Gems | $11.99 | one-time |
| Event Premium Pass | $11.99 | one-time |
| Remove Ads Bundle | $11.99 | one-time |
| Ultra Chests | $12.99 | one-time |
| Chest of Potions | $12.99 | one-time |
| Regal Mine Pack | $12.99 | one-time |
| Offline boost 2 | $12.99 | one-time |
| Pieces of Potions | $23.99 | one-time |
| Event Premium Pass | $24.99 | one-time |
| Chest of Mithril | $34.99 | one-time |
| Big Amount of Potions | $34.99 | one-time |
| Treasure Hoard | $34.99 | one-time |
| Huge Amount of Potions | $59.99 | one-time |
| Wagon of Mithril | $59.99 | one-time |
| 1300 Gems | $119.99 | one-time |
| Giant Amount of Potions | $119.99 | one-time |

**What reviewers like**

- 🚀 Fun and addictive gameplay
- 👍 Cute and charming art style
- 🚀 Quick progress and upgrades
- 👍 No forced ads
- 👍 Engaging tower defense mechanics

**What reviewers complain about**

- 🐛 Difficulty spike at higher levels
- 💰 Potential pay-to-progress issues
- 🐛 Repetitive gameplay over time
- 🐛 Occasional crashes or bugs

**Reported bugs**

- Crashes during high-level waves
- Progression roadblocks at certain points
- Inconsistent performance on older devices

**Requested features**

- More cat variety and customization
- Expanded event and challenge modes
- Offline/idle progression features
- Improved level design and enemy variety


### Underdark

[App page](https://appshunter.io/ios/app/underdarkdefense/id6482025287)

Defend the Eternal Flame from relentless dark forces in this tactical tower defense game. Strategically place towers, choose buffs, and level up your heroes to forge an impenetrable defense. Enjoy one-handed gameplay for strategic fun anytime, anywhere.

**Highlights:** Defend the Eternal Flame, One-handed gameplay, Customize defense strategy, Level up and choose buffs, Hero abilities and enhancements, Earn trophies

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

**In-app purchases (34)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Event Package 1 | $0.99 | one-time |
| daily_package_01 | $0.99 | one-time |
| season_growth_1 | $0.99 | one-time |
| dailyshop_1 | $1.99 | one-time |
| blade_pakcage | $2.99 | one-time |
| daily_package_02 | $2.99 | one-time |
| exp_2x | $3.49 | one-time |
| skin_30501 | $3.49 | one-time |
| Event Package 2 | $3.99 | one-time |
| pet_package | $4.99 | one-time |
| weekly_package_01 | $6.99 | one-time |
| add_speed | $7.49 | one-time |
| pass_hero_115 | $7.49 | one-time |
| pass_hero_102 | $7.49 | one-time |
| pass_hero_110 | $7.49 | one-time |
| season_superpass_1 | $7.99 | one-time |
| pack_remove_ads | $7.99 | one-time |
| daily_package_03 | $7.99 | one-time |
| hero_legend_santa | $8.99 | one-time |
| hero_legend_tower | $8.99 | one-time |
| hero_legend_armor | $8.99 | one-time |
| Event Package 3 | $8.99 | one-time |
| hero_legend_joker | $8.99 | one-time |
| hero_legend_necromancer | $8.99 | one-time |
| hero_legend_chicken | $8.99 | one-time |
| tower_legend_614 | $8.99 | one-time |
| ud_pack_20106 | $8.99 | one-time |
| tower_legend_628 | $8.99 | one-time |
| pack_remove_ads2 | $10.99 | one-time |
| Event Package 4 | $12.99 | one-time |
| season_level_1 | $16.99 | one-time |
| season_stage_1 | $16.99 | one-time |
| Event Package 5 | $17.99 | one-time |
| season_hyperpass_1 | $18.99 | one-time |

**What reviewers like**

- 🚀 Addictive gameplay
- 👍 Generous with rewards
- 🚀 Smooth performance
- 👍 No forced ads
- 👍 Unique tower defense mechanics

**What reviewers complain about**

- 🐛 Multiplayer issues
- 🔋 Battery drain
- 🔒 Paywall for progression
- 🔒 Excessive microtransactions
- 🔒 Confusing UI with too many menus

**Reported bugs**

- Goblin tower factory causing game slowdown
- Consecutive login rewards reset after updates
- Invisible towers in multiplayer

**Requested features**

- Ability to rotate towers
- Move towers after placement
- More enemy variety and animations
- Improved co-op mode
- Simplified progression system


## Frequently asked questions

### Is Kitty Keep™ free?

Kitty Keep™ is free to download, with in-app purchases available.

### Is Underdark free?

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

### Which has better reviews, Kitty Keep™ or Underdark?

Kitty Keep™ is rated higher. Kitty Keep™ averages 4.9 out of 5 from 4.5K ratings, while Underdark averages 4.8 from 4K ratings.

### Do Kitty Keep™ or Underdark have ads?

Both Kitty Keep™ and Underdark show ads.

### Which is updated more often, Kitty Keep™ or Underdark?

Kitty Keep™ ships an update fortnightly, and Underdark every 4 days. Most recently, Kitty Keep™ was updated on September 24, 2026 and Underdark on September 24, 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.*