# Stellar! vs Underdark

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.

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 23, 2026 respectively.

## The numbers

| Metric | Stellar! | Underdark |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.2 (5 ratings)](https://appshunter.io/ios/app/stellar-infinity-defense/id1379005158/reviews) | **[4.8 (4.1K ratings)](https://appshunter.io/ios/app/underdarkdefense/id6482025287/reviews)** |
| Number of ratings | 5 | **4.1K** |
| Positive reviews | **83.3% of reviews** | 72.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | **Every 4 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 104 MB | 508 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 4+ |
| Developer | [SeHyeon Im](https://appshunter.io/developer/1294084939) | [SeungHo Chung](https://appshunter.io/developer/1626940418) |

## What reviewers say

### Stellar!

[App page](https://appshunter.io/ios/app/stellar-infinity-defense/id1379005158)

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.

**Highlights:** Control spaceship to defend base, Select tactical upgrades, Loot spaceships and towers, Unique tower abilities, Combine spaceship and tower cards, Global ranking system

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 20 GEMS | $0.99 | one-time |
| 110 GEMS | $4.99 | one-time |
| 240 GEMS | $9.99 | one-time |
| 550 GEMS | $19.99 | one-time |
| 1500 GEMS | $49.99 | one-time |
| 3200 GEMS | $99.99 | one-time |


### 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 Stellar! free?

Stellar! 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, Stellar! or Underdark?

Underdark is rated higher. Stellar! averages 2.2 out of 5 from 5 ratings, while Underdark averages 4.8 from 4.1K ratings.

### Do Stellar! or Underdark have ads?

Both Stellar! and Underdark show ads.

### Which is updated more often, Stellar! or Underdark?

Stellar! ships an update every 2 months, and Underdark every 4 days. Most recently, Stellar! was updated on October 4, 2026 and Underdark on October 23, 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.*