Z vs Alien Defense
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Z
Engage in thrilling zombie combat and upgrade your powerful Z-Machine. Battle through hordes of undead enemies to survive and conquer the apocalypse.
- Zombie combat
- Vehicle upgrades
- Horde survival
- Apocalypse battles
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Upgrade your Z-Machine! Defeat the Hordes of Zombies!
Alien Defense
Lead special forces against alien invaders in this strategy game. Command your troops to defend Area 51 and achieve victory against extraterrestrial hordes. Your strategic decisions are crucial for survival.
- Lead special forces
- Defend Area 51
- Strategy gameplay
- Defeat alien hordes
- Commander role
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Unknown invaders from outer space attack Area 51! Become a commander and lead your last hope, special forces, to defeat the alien hordes. Your command is the key to victory in this tense strategy game!
Screenshots
Verdict
The clearest difference is ratings volume: Z at 319 against Alien Defense's 16. On price, rating, review sentiment and update cadence 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. Z sells 4 one-off in-app purchases and Alien Defense sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 3.4 for Z against 3.3 for Alien Defense. That said, the two scores are not equally well evidenced: Z has 319 ratings behind it against 16, so its average is the more settled of the two. Written reviews are what separate them: 35% of Z's written reviews are positive against 33% of Alien Defense's.
Z ships an update fortnightly, Alien Defense weekly. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.
| Parameter | Z | Alien Defense |
|---|---|---|
| Price | Free | Free |
| Rating | 3.4 (319 ratings) — better | 3.3 (16 ratings) |
| Positive reviews | 34.9% of reviews — better | 33.3% of reviews |
| Number of ratings | 319 — better | 16 |
| Update frequency | Fortnightly | Weekly — 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 | 12.0 — better |
| Further details — not scored | ||
| Size | 277 MB | 407 MB |
| Age rating | 9+ | 12+ |
| Developer | Yso Corp | GOODROID,Inc. |
Customer experience
Z
Alien Defense
Bugs and requests
Z
Reported bugs
3 issues- Game crashing or freezing
- Inability to progress past certain levels
- Paid features not functioning correctly
Requested features
3 requests- More levels and worlds to explore
- Ability to disable ads permanently
- Improved performance and stability
Alien Defense
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Z
- Character Pack$2.99
- Remove ads$2.99
- Vehicule Pack$2.99
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- Starter Pack$3.99
Alien Defense
- Starter Pack$17.99
- NO ADS$19.99
- Coin x2$19.99
