Comparison

Loop Hero vs Underdark

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

Loop Hero

Embark on a roguelike RPG adventure where you strategically place cards to create enemy encounters, buildings, and terrain. Equip your hero with powerful loot, expand your camp, and unlock new classes and cards to break an endless cycle of despair and save a forgotten world.

Highlights
  • Randomly generated expedition loops
  • Strategic card placement for trials
  • Loot collection for hero progression
  • Camp expansion and reconstruction
  • Unlockable classes and cards
  • Retro pixel art dark fantasy story
Features
Read full description

*Try Loop Hero for free and unlock the full game for the whole adventure!* The Lich has thrown the world into a timeless loop and plunged its inhabitants into never ending chaos. In this roguelike RPG, wield an expanding deck of mystical cards to place enemies, buildings, and terrain along each unique expedition loop for the brave hero. Recover and equip powerful loot for each class of hero for their battles and expand the survivors' camp to reinforce each adventure through the loop. Unlock new classes, new cards, and devious guardians on your quest to shatter the endless cycle of despair. FEATURES - Explore an endless number of paths: bring your hero on randomly generated loops and never experience the same run twice. - Shape your expeditions into darkness: build your deck and place your cards to script your hero’s trials and tribulations. - Loot as you loop to rebuild the world: recover your memories as you collect equipment and resources to become stronger, reconstruct your camp and get your reality back. - Plunge into a gloomy universe: discover a melancholic dark fantasy story told through a retro pixel art direction and recollect the memories of this world. - Break the cycle: triumph over mighty bosses to free the world from the Lich’s neverending time loop. CAREFULLY REDESIGNED FOR MOBILE - Revamped interface – exclusive mobile UI with complete touch control - Game Center achievements - Cloud Save – Share your progress between iOS devices - Compatible with MFi controllers - iPhone 15 Optimization (including Pro Max)

About

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.

Highlights
  • Defend the Eternal Flame
  • One-handed gameplay
  • Customize defense strategy
  • Level up and choose buffs
  • Hero abilities and enhancements
  • Earn trophies
Features
Read full description

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

Loop Hero4 screens
Underdark4 screens

Verdict

The call

The clearest difference is ads: Loop Hero at none against Underdark's shown. Underdark's advantage is update cadence (every 4 days vs every 10 days) and iOS requirement (13.0 vs 15.0). On price, rating, review sentiment and ratings volume 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Loop Hero sells 1 one-off in-app purchase and Underdark sells 34 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for Loop Hero against 4.8 for Underdark. Both are backed by a comparable volume of ratings — 3.9K and 4K respectively. Written reviews are what separate them: 75% of Loop Hero's written reviews are positive against 72% of Underdark's.

UpkeepUpdate frequency

Loop Hero ships an update every 10 days, Underdark every 4 days. The most recent releases landed on September 22, 2026 and September 24, 2026 respectively.

Scorecard3 real differences · 7 level
Loop Hero versus Underdark: the parameters behind the verdict, then further details
ParameterLoop HeroUnderdark
PriceFreeFree
Rating4.9 (3.9K ratings) — better4.8 (4K ratings)
Positive reviews75.1% of reviews — better72.4% of reviews
Number of ratings3.9K4K — better
Update frequencyEvery 10 daysEvery 4 days — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.013.0 — better
Further details — not scored
Size213 MB490 MB
Age rating9+4+
DeveloperPlaydigiousSeungHo Chung

Customer experience

Loop Hero

All ratings3,814 ratings
Positive97.5%
Neutral0.7%
Negative1.8%
Written reviews285 reviews
Positive75.1%
Neutral6.7%
Negative18.2%

Underdark

All ratings4,047 ratings
Positive95.1%
Neutral2.2%
Negative2.8%
Written reviews826 reviews
Positive72.4%
Neutral8.8%
Negative18.8%

User reviews

Loop Hero

From 3.9K App Store ratings

What we love

  • 👍 Excellent mechanics
  • 👍 Great replayability
  • 👍 Charming graphics
  • 👍 Unique and enjoyable experience
  • 👍 Smooth gameplay

Room to improve

  • 🐛 Sound doesn't work
  • 🐛 Crashes and freezes
  • 🐛 Unresponsive after certain actions
  • 🐛 Difficulty reading small text
  • 🐛 Accidental card placement

Underdark

From 4K App Store ratings

What 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

Loop Hero

Reported bugs

3 issues
  • Game crashes after defeating first boss
  • Unplayable after initial progress
  • Inability to progress past trial version

Requested features

4 requests
  • Portrait mode
  • More classes/build diversity
  • Improved UI/overlay customization
  • Chinese language support

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

1 purchases

Loop Hero

One-time1
  • Unlock Full Game$6.99
34 purchases

Underdark

One-time34
  • Event Package 1$0.99
  • daily_package_01$0.99
  • season_growth_1$0.99
Show 31 more
  • 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

Questions

Is Loop Hero free?
Loop Hero 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, Loop Hero or Underdark?
Loop Hero is rated higher. Loop Hero averages 4.9 out of 5 from 3.9K ratings, while Underdark averages 4.8 from 4K ratings.
Do Loop Hero or Underdark have ads?
Underdark shows ads; Loop Hero does not.
Which is updated more often, Loop Hero or Underdark?
Loop Hero ships an update every 10 days, and Underdark every 4 days. Most recently, Loop Hero was updated on September 22, 2026 and Underdark on September 24, 2026.

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