Comparison

Blue Defense vs Zen Bump 3D

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

Head to head
About

Blue Defense

Defend your planet from alien invaders using a powerful cannon. Engage in intense arcade action with various game modes, leaderboards, and unlockable content. Enjoy updated retro graphics and flexible controls.

Highlights
  • Planet cannon for mass enemy destruction
  • Gauntlet mode to win the game
  • Infinite-Classic and Infinite-Quickstart modes
  • Level select with medal earning
  • 74 global leaderboards
  • Automatic save state
  • Multi-touch and tilt controls
Features
Read full description

"Entirely unique, without peer on the app store!" - NoDpad "Original, intense, addictive, and most of all, fun!" - 148apps Intense planetary defense arcade action! The Blue planet is in peril - take the fight into your own hands, and blast the evil Red and Green enemies out of the sky with the all-new planet cannon! Blue Defense: Second Wave builds on the legendary pick-up-and-play gameplay of the original 2008 hit, hailed as an "App Store classic" by many. With game modes ranging from just seconds to several hours, you won't be able to put it down!* 6.8 billion lives hang in the balance... how long can you keep them alive? "A game that's not to be missed." - TouchArcade "A brilliantly executed game... Replay value is outstanding!" - AppSmile Features: - The planet cannon lets you take out hundreds of enemies at once! - All-new Gauntlet mode lets you win the game!** - Infinite-Classic and Infinite-Quickstart modes - last as long as you can! - Level select mode - practice a level, and earn medals for your skills! - 74 mode-based global leaderboards! - Automatic save state - continue your game, even without iOS 4! - Updated retro art style - iPhone 4 Retina resolution graphics - Runs smooth and fast even on the oldest devices Content: - Red and Green enemies! - 24 enemy types! - 64 all-new levels! - Over 200 medals to obtain! Controls: - Both multitouch and tilt controls available, both can be used simultaneously - Tilt controls: bullets shoot up, unless there's no gravity where you are - Multi-target locking: double-tap the screen where you want to continue shooting - Planet cannon: tap and drag from the planet to aim, release to fire - Double-tap the planet to pause * Seriously, there's a guy who told me he'd play it quietly in his pew waiting for church to start! ** It's the only game mode where you can have more than 0 lives at the end...

About

Zen Bump 3D

Experience ultimate relaxation with this endlessly satisfying game. Simply bump shapes without any pressure or goals, offering a stress-free and enjoyable escape. It's a modern zen garden designed for pure, blissful entertainment.

Highlights
  • Endless levels
  • Stress-free gameplay
  • Satisfying bumping mechanics
  • Relaxing atmosphere
  • Simple controls
Features
Read full description

Your newest, and most relaxing addiction. So easy to play and nothing to master, just bliss out bumping things endlessly. Relax and bump shapes around without a care. Nothing to avoid, nothing to make you lose, nothing to cause stress. Literally don’t even have to play it to have a satisfying and enjoyable time. Endless levels, it does not stop ever. A zen garden for modern times.

Screenshots

Blue Defense4 screens
Zen Bump 3D4 screens

Verdict

The call

The clearest difference is price: Blue Defense at Free against Zen Bump 3D's $1.99. Blue Defense also leads on ratings volume (20 vs 1). Zen Bump 3D's advantage is rating (5.0 vs 4.3) and in-app purchases (none vs 1). On update cadence, 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

Blue Defense is free to download; Zen Bump 3D costs $1.99 up front. Blue Defense sells 1 one-off in-app purchase. Zen Bump 3D asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Zen Bump 3D holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: Blue Defense has 20 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 82% of Blue Defense's written reviews are positive against 100% of Zen Bump 3D's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

Scorecard7 real differences · 3 level
Blue Defense versus Zen Bump 3D: the parameters behind the verdict, then further details
ParameterBlue DefenseZen Bump 3D
PriceFree — better$1.99
Rating4.3 (20 ratings)5.0 (1 ratings) — better
Positive reviews81.6% of reviews100.0% of reviews — better
Number of ratings20 — better1
Update frequencyEvery 3 monthsEvery 3 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.012.0 — better
Further details — not scored
Size16 MB90 MB
Age rating9+4+
DeveloperCat in a Box SoftwareBen Lew

Customer experience

Blue Defense

All ratings20 ratings
Positive85.0%
Neutral0.0%
Negative15.0%
Written reviews49 reviews
Positive81.6%
Neutral4.1%
Negative14.3%

Zen Bump 3D

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

Blue Defense

One-time1
  • Full Content$1.99
None

Zen Bump 3D

No in-app purchases

Questions

Is Blue Defense free?
Blue Defense is free to download, with in-app purchases available.
Is Zen Bump 3D free?
Zen Bump 3D costs $1.99, with no in-app purchases.
Which has better reviews, Blue Defense or Zen Bump 3D?
Zen Bump 3D is rated higher. Blue Defense averages 4.3 out of 5 from 20 ratings, while Zen Bump 3D averages 5.0 from 1 ratings.
Do Blue Defense or Zen Bump 3D have ads?
Neither Blue Defense nor Zen Bump 3D shows ads.
Which is updated more often, Blue Defense or Zen Bump 3D?
Blue Defense ships an update every 3 months, and Zen Bump 3D every 3 months. Most recently, Blue Defense was updated on November 1, 2026 and Zen Bump 3D on November 4, 2026.

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