Comparison

Eternal Ember vs Underdark

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

Head to head
About

Eternal Ember

Embark on an epic idle RPG adventure in a dark fantasy world. Assemble a team of heroes, strategize their placement, and watch them battle automatically. Collect loot, craft gear, and explore a vast continent to save the world from impending doom.

Highlights
  • Dark Fantasy Idle RPG
  • Hero Collection and Classes
  • Strategic Squad Positioning
  • Automatic Battles
  • Loot Grinding and Gear Crafting
  • Vast Continent Exploration
  • Challenging Bosses and Monsters
Features
Read full description

Background Story God left us. The devils from the hell have reached their claws into our world, and the enemy in the void is also staring at us with hostility. In this vital time, we need to save the world more than any time, but God is still silent. So, we can only pick up our weapons and fight for your own survival. Adventurers, except for you, who else can stand up, fight with us against the devils? Eternal Ember is a Dark Fantasy style Online Idle RPG. You need to build an adventure team to explore the vast continent, engage in exciting battles and get the loots. Game Features Category of Monsters From the basic goblins, skeletons, to the giant golems, hell devils, a wide variety of monsters are waiting for your challenges. The various categories of monsters’ skills require you to constantly adjust your strategy in the battle. In addition, there are 9 main storyline bosses and more elites, and you must be more careful when fighting with them. Various Classes There are heroes of various classes in the game. Currently, there are 8 classes available: Crusader, Ranger, Priest, Warrior, Hunter, Shaman, Sorcerer and Necro Knight. Each hero can also unlock exclusive ultimate skills, talent trees etc., completely change hero function and strategy, and create more genre of tactical play. Idle Strategy for Your Squad In most cases, you need to send four heroes to fight at the same time, so you not only need to consider the hero classes, the potions you carry, but also how to arrange the positioning of heroes in the map, to lead the battle toward the direction of your planning. After doing a good pre-plan, you just need to relax, watch the heroes to automatically fight with monsters in different maps. Yes, this game doesn't need you to do too much operation during the battle, give everything to the heroes! Customized Build If you like to grind, the game is full of loots. Over 100 kinds of weapons and gears are waiting for you. Gears are the important part of the game. The loots in the game is also mainly based on the gears. After all, nobody can resist the joyful sound when looting the legendary gear after killing the monster. The game provides great freedom to those who like to pursue the ultimate gear sets. In the blacksmith, you can create your own exclusive gears, from multiple dimensions to improve the properties of gears, make it better to fit your game style. Vast Continent The continent in the game is divided into 11 major plates. Each plate has completely different terrain and various fierce monsters. And there are multiple special map nodes in the game, whether you want to test your own limit or with NPC to resist fierce enemies, you can get a completely different combat experience. The whole world is waiting for you to challenge. Explore the Rift There is a very mysterious field in the game – the Shadow Realm. Among them, there are very powerful and unique shadow monsters. Can you overcome them, get cherished treasures? Epilog Eternal Ember is a free world and hope you can like it as much as we do. Good luck and loot well.

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

Eternal Ember4 screens
Underdark4 screens

Verdict

The call

The clearest difference is update cadence: Underdark at every 4 days against Eternal Ember's every 2 months. Underdark also leads on review sentiment (72% vs 56%) 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Eternal Ember sells 18 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.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for Eternal Ember against 4.8 for Underdark. Both are backed by a comparable volume of ratings — 1.9K and 4.1K respectively. Written reviews are what separate them: 56% of Eternal Ember's written reviews are positive against 72% of Underdark's.

UpkeepUpdate frequency

Eternal Ember ships an update every 2 months, Underdark every 4 days. Both last shipped on October 27, 2026.

Scorecard3 real differences · 7 level
Eternal Ember versus Underdark: the parameters behind the verdict, then further details
ParameterEternal EmberUnderdark
PriceFreeFree
Rating4.9 (1.9K ratings) — better4.8 (4.1K ratings)
Positive reviews55.8% of reviews72.0% of reviews — better
Number of ratings1.9K4.1K — better
Update frequencyEvery 2 monthsEvery 4 days — better
AdsYesYes
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
Size601 MB508 MB
Age rating12+4+
DeveloperZencat GamingSeungHo Chung

Customer experience

Eternal Ember

All ratings1,765 ratings
Positive97.7%
Neutral0.6%
Negative1.7%
Written reviews95 reviews
Positive55.8%
Neutral6.3%
Negative37.9%

Underdark

All ratings4,088 ratings
Positive95.1%
Neutral2.2%
Negative2.8%
Written reviews833 reviews
Positive72.0%
Neutral8.9%
Negative19.1%

User reviews

Eternal Ember

From 1.9K App Store ratings

What we love

  • 👍 Good premise
  • 🎨 Nice artwork
  • 🕹️ Enjoyable gameplay

Room to improve

  • 🕰️ Slow progression
  • 💰 Monetization issues
  • 🔍 Confusing UI/menus
  • 🐛 Bugs and glitches

Underdark

From 4.1K 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

Eternal Ember

Reported bugs

3 issues
  • Server connection issues
  • Claim rewards button not working
  • Talent tree not functioning properly

Requested features

4 requests
  • New heroes and features
  • Improved offline progression
  • Better notification system
  • Optimization for F2P players

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

18 purchases

Eternal Ember

One-time18
  • Limited Time Pack1$0.99
  • Limited Time Pack2$1.99
  • Battle Pass$4.99
Show 15 more
  • Limited Time Pack3$4.99
  • 30-Day Nonstop Privilege$4.99
  • 450 Sunstones$4.99
  • Hero Pack1$9.99
  • Custom Pack1$9.99
  • Hero Pack2$9.99
  • Limited Time Pack4$9.99
  • Hero Pack3$9.99
  • 1,000 Sunstones$9.99
  • Limited Time Pack5$19.99
  • 2,100 Sunstones$19.99
  • Limited Time Pack6$49.99
  • 11,000 Diamonds$99.99
  • 11,000 Sunstones$99.99
  • Limited Time Pack7$99.99
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 Eternal Ember free?
Eternal Ember 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, Eternal Ember or Underdark?
Eternal Ember is rated higher. Eternal Ember averages 4.9 out of 5 from 1.9K ratings, while Underdark averages 4.8 from 4.1K ratings.
Do Eternal Ember or Underdark have ads?
Both Eternal Ember and Underdark show ads.
Which is updated more often, Eternal Ember or Underdark?
Eternal Ember ships an update every 2 months, and Underdark every 4 days. Most recently, Eternal Ember was updated on October 27, 2026 and Underdark on October 27, 2026.

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