Stellar! vs Underdark
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Stellar!
Defend the last planet with life from alien robots by controlling a spaceship and strategically placing towers. Loot spaceships and towers, upgrade abilities, and combine cards to build your unique defense strategy. Compete globally on the ranking system.
- Control spaceship to defend base
- Select tactical upgrades
- Loot spaceships and towers
- Unique tower abilities
- Combine spaceship and tower cards
- Global ranking system
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Welcome, Captain! In the current world ruled by robots, this is the only planet with life. Alien robots are constantly trying to eliminate life on this planet Protect the planet from alien robots! Features ● Protect the base from enemies by controlling the spaceship ● After each stage, you can select tactical upgrades to protect your base ● Open supply crates to loot spaceships and towers and place them tactically ● Every tower has unique abilities and skills. Use skills to defend more effectively ● Build your own strategy by combining spaceship and tower cards ● You can compete with players around the world using the ranking system owings37@gmail.com - Credit Sound: www.bensound.com
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
The clearest difference is rating: Underdark at 4.8 against Stellar!'s 2.2. Underdark also leads on update cadence (every 4 days vs every 2 months) and ratings volume (4.1K vs 5). Stellar!'s advantage is review sentiment (83% vs 72%). On price, ads, in-app purchases and monetization model 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. Stellar! sells 6 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.
Underdark holds the better App Store score, 4.8 against 2.2. That said, the two scores are not equally well evidenced: Underdark has 4.1K ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 83% of Stellar!'s written reviews are positive against 72% of Underdark's, so the app with the better star average is not the one people write more warmly about.
Stellar! ships an update every 2 months, Underdark every 4 days. The most recent releases landed on October 4, 2026 and October 22, 2026 respectively.
| Parameter | Stellar! | Underdark |
|---|---|---|
| Price | Free | Free |
| Rating | 2.2 (5 ratings) | 4.8 (4.1K ratings) — better |
| Positive reviews | 83.3% of reviews — better | 72.0% of reviews |
| Number of ratings | 5 | 4.1K — better |
| Update frequency | Every 2 months | 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 | 13.0 | 13.0 |
| Further details — not scored | ||
| Size | 104 MB | 508 MB |
| Age rating | 9+ | 4+ |
| Developer | SeHyeon Im | SeungHo Chung |
Customer experience
Stellar!
Underdark
Bugs and requests
Stellar!
Not enough reviews yet to summarise bugs or requests.
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
Stellar!
- 20 GEMS$0.99
- 110 GEMS$4.99
- 240 GEMS$9.99
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- 550 GEMS$19.99
- 1500 GEMS$49.99
- 3200 GEMS$99.99
Underdark
- Event Package 1$0.99
- daily_package_01$0.99
- season_growth_1$0.99
Show 31 moreShow fewer
- 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
