Kitty Keep™ vs Underdark
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Kitty Keep™
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.
- 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
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Journey to the beach for a cat-filled offline tower defense (TD) adventure! Strategize with cute cat heroes, growing your castle to thwart invaders. Level up unique cat heroes to turn the tide on sea creature enemies by using the power of claws, water, and sand! Experience a seamless fusion of idle and tower defense strategy, effortlessly earning rewards through Auto-battle! Join the legion of cat commanders worldwide for a purr-fect mix of tower defense fun and tactics!
Underdark
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.
- Defend the Eternal Flame
- One-handed gameplay
- Customize defense strategy
- Level up and choose buffs
- Hero abilities and enhancements
- Earn trophies
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Defend the Flame from the dark! Level up, strategically place towers, and choose buffs to grow stronger. Keep the light alive! Defend the Eternal Flame: Experience the thrill of defending the flame from hordes of dark forces that besiege it! Feel the exhilaration as you clear stages, with each victory more satisfying than the last. One-Handed Gameplay: Enjoy easy-to-master controls, designed for one-handed play. Perfect for strategic fun anytime, anywhere. Customize Your Defense Strategy: Select buffs and strategically place towers to forge your path of resistance. As you level up and choose your growth buffs, your defense becomes an impenetrable fortress. Heroic Stand: Choose your guardians to stand against the night. Each hero brings unique abilities to the battlefield. Earn trophies, level up, and enhance your heroes to ensure the flame flickers on through the darkest nights!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Kitty Keep™ | Underdark |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (4.5K ratings) — better | 4.8 (4K ratings) |
| Positive reviews | 95.6% of reviews — better | 72.4% of reviews |
| Number of ratings | 4.5K — better | 4K |
| Update frequency | Fortnightly | Every 4 days — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 354 MB | 490 MB |
| Age rating | 9+ | 4+ |
| Developer | Funovus LLC | SeungHo Chung |
Customer experience
Kitty Keep™
Underdark
User reviews
Kitty Keep™
From 4.5K App Store ratingsWhat we love
- 🚀 Fun and addictive gameplay
- 👍 Cute and charming art style
- 🚀 Quick progress and upgrades
- 👍 No forced ads
- 👍 Engaging tower defense mechanics
Room to improve
- 🐛 Difficulty spike at higher levels
- 💰 Potential pay-to-progress issues
- 🐛 Repetitive gameplay over time
- 🐛 Occasional crashes or bugs
Underdark
From 4K App Store ratingsWhat we love
- 🚀 Addictive gameplay
- 👍 Generous with rewards
- 🚀 Smooth performance
- 👍 No forced ads
- 👍 Unique tower defense mechanics
Room to improve
- 🐛 Multiplayer issues
- 🔋 Battery drain
- 🔒 Paywall for progression
- 🔒 Excessive microtransactions
- 🔒 Confusing UI with too many menus
Bugs and requests
Kitty Keep™
Reported bugs
3 issues- Crashes during high-level waves
- Progression roadblocks at certain points
- Inconsistent performance on older devices
Requested features
4 requests- More cat variety and customization
- Expanded event and challenge modes
- Offline/idle progression features
- Improved level design and enemy variety
Underdark
Reported bugs
3 issues- Goblin tower factory causing game slowdown
- Consecutive login rewards reset after updates
- Invisible towers in multiplayer
Requested features
5 requests- Ability to rotate towers
- Move towers after placement
- More enemy variety and animations
- Improved co-op mode
- Simplified progression system
In-app purchases
Kitty Keep™
- 1 Hour Auto Battle$3.99
- Handful of Gold$3.99
- Pile of Gold$5.99
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- Basic Mine Pack$5.99
- More Gems$5.99
- Event Pass$5.99
- Pouch of Potions$5.99
- Basic Starter Pack$5.99
- 50 Gems$5.99
- Event Starter Pack$5.99
- Event Hero Pack$5.99
- Treasure Pile$5.99
- Offline boost 1$5.99
- Event Pass2 variants$9.99
- Treasure Trove$11.99
- Secret Lab Bundle$11.99
- 100 Gems$11.99
- Event Premium Pass$11.99
- Remove Ads Bundle$11.99
- Ultra Chests$12.99
- Chest of Potions$12.99
- Regal Mine Pack$12.99
- Offline boost 2$12.99
- Pieces of Potions$23.99
- Event Premium Pass$24.99
- Chest of Mithril$34.99
- Big Amount of Potions$34.99
- Treasure Hoard$34.99
- Huge Amount of Potions$59.99
- Wagon of Mithril$59.99
- 1300 Gems$119.99
- Giant Amount of Potions$119.99
Underdark
- Event Package 1$0.99
- daily_package_01$0.99
- season_growth_1$0.99
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- dailyshop_1$1.99
- blade_pakcage$2.99
- daily_package_02$2.99
- exp_2x$3.49
- skin_30501$3.49
- Event Package 2$3.99
- pet_package$4.99
- weekly_package_01$6.99
- add_speed$7.49
- pass_hero_115$7.49
- pass_hero_102$7.49
- pass_hero_110$7.49
- season_superpass_1$7.99
- pack_remove_ads$7.99
- daily_package_03$7.99
- hero_legend_santa$8.99
- hero_legend_tower$8.99
- hero_legend_armor$8.99
- Event Package 3$8.99
- hero_legend_joker$8.99
- hero_legend_necromancer$8.99
- hero_legend_chicken$8.99
- tower_legend_614$8.99
- ud_pack_20106$8.99
- tower_legend_628$8.99
- pack_remove_ads2$10.99
- Event Package 4$12.99
- season_level_1$16.99
- season_stage_1$16.99
- Event Package 5$17.99
- season_hyperpass_1$18.99
