Comparison

Stack 101 Tower vs Kaiju Defense

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

Head to head
About

Stack 101 Tower

Features
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Stack 101 Tower: The Boba Challenge Eyes of a Hawk. Hands of a God. Can you reach 101? Stop playing casual. Stack 101 Tower is the ultimate test of precision and speed. No more excuses—without razor-sharp eyesight and lightning reflexes, you'll never survive the climb. • God-Tier Precision: One pixel off, and it’s game over. Only the elite can maintain the balance. • Rapid Reflexes: The higher you go, the faster it gets. Do you have the speed to keep up? • The Ultimate Reward: Only a true Stacking King can reach Floor 101 to claim the legendary Pearl Milk Tea. The Boba is at the top. Are you fast enough to take it?

About

Kaiju Defense

Features
Read full description

Alien monsters and giant kaiju are climbing 100 landmarks! Aim your cannon and hit only the monsters. Every stray shell damages the building and the citizens inside. ■ 100 landmarks, 200 stages Every landmark has its own structure and sky — defend them all. Clear 100 stages to unlock "Recovery Ops", where you defend landmarks under repair. ■ Buildings that collapse for real Buildings break apart block by block. Lose the supports and they tilt and topple; catch fire and the flames spread until they fall. Falling debris crushes the monsters below. ■ 7 shell types High-explosive, precision, cryo (freezes and extinguishes), incendiary (fire zones), heavy, cluster and piercing — pick the right one for every situation. ■ Monsters and giant kaiju Crawlers that scale walls, steel gorillas that pound rooftops, UFOs that abduct citizens, and a giant kaiju every 10 stages. ■ Protect the citizens Buy time for the citizens inside to evacuate. Three stars depend on how much of the building you save and how few citizens get hurt.

Screenshots

Stack 101 Tower4 screens
Kaiju Defense4 screens

Verdict

The call

The clearest difference is in-app purchases: Stack 101 Tower at none against Kaiju Defense's 1. Stack 101 Tower also leads on iOS requirement (12.0 vs 15.0). Kaiju Defense's advantage is update cadence (every 2 days vs every 5 days). On price, ads and device support 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. Kaiju Defense sells 1 one-off in-app purchase. Stack 101 Tower asks for nothing beyond the download.

UpkeepUpdate frequency

Stack 101 Tower ships an update every 5 days, Kaiju Defense every 2 days. The most recent releases landed on October 31, 2026 and November 1, 2026 respectively.

Scorecard3 real differences · 3 level
Stack 101 Tower versus Kaiju Defense: the parameters behind the verdict, then further details
ParameterStack 101 TowerKaiju Defense
PriceFreeFree
Update frequencyEvery 5 daysEvery 2 days — better
AdsYesYes
In-app purchasesNo — betterYes
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better15.0
Further details — not scored
Size54 MB88 MB
Age rating4+12+
DeveloperZHENG YU-XIANGJegeon Jung

In-app purchases

None

Stack 101 Tower

No in-app purchases

1 purchases

Kaiju Defense

One-time1
  • Remove Ads$2.99

Questions

Is Stack 101 Tower free?
Stack 101 Tower is free to download, with no in-app purchases.
Is Kaiju Defense free?
Kaiju Defense is free to download, with in-app purchases available.
Do Stack 101 Tower or Kaiju Defense have ads?
Both Stack 101 Tower and Kaiju Defense show ads.
Which is updated more often, Stack 101 Tower or Kaiju Defense?
Stack 101 Tower ships an update every 5 days, and Kaiju Defense every 2 days. Most recently, Stack 101 Tower was updated on October 31, 2026 and Kaiju Defense on November 1, 2026.

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