# Underdark vs Blob Attack

The clearest difference is in-app purchases: Blob Attack at none against Underdark's 35. Underdark's advantage is update cadence (every 4 days vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Underdark sells 34 one-off in-app purchases. Blob Attack asks for nothing beyond the download.

Underdark ships an update every 4 days, Blob Attack every 2 months. The most recent releases landed on September 26, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Underdark | Blob Attack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (4.1K ratings)](https://appshunter.io/ios/app/underdarkdefense/id6482025287/reviews)** | — |
| Number of ratings | **4.1K** | — |
| Positive reviews | 72.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 4 days** | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 490 MB | 109 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 9+ |
| Developer | [SeungHo Chung](https://appshunter.io/developer/1626940418) | [Stanislav Buchkov](https://appshunter.io/developer/1701078535) |

## What reviewers say

### 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


### Blob Attack

[App page](https://appshunter.io/ios/app/blob-attack-tower-defense/id6737120580)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Underdark free?

Underdark is free to download, with in-app purchases available.

### Is Blob Attack free?

Blob Attack is free to download, with no in-app purchases.

### Do Underdark or Blob Attack have ads?

Both Underdark and Blob Attack show ads.

### Which is updated more often, Underdark or Blob Attack?

Underdark ships an update every 4 days, and Blob Attack every 2 months. Most recently, Underdark was updated on September 26, 2026 and Blob Attack on September 12, 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.*