Comparison

Blue Defense vs Circles JS

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

Circles JS

Features
Read full description

The sequel to the 2015 hit game Circles is finally here and it's more fun than ever! Survive for as long as possible through endless waves in this casual and easy to learn but hard to master action game. Avoid the red circles and pop as many green ones as you can to increase your score. Colliding with a red circle means it's game over, so make sure to get rid of them by popping the blue, orange and purple ones. How many points can you get? Can you beat your friends? Game features: • Fast-paced, fun and addictive gameplay • Intuitive and customizable one-handed controls • No ads or other annoyances

Screenshots

Blue Defense4 screens
Circles JS3 screens

Verdict

The call

The clearest difference is in-app purchases: Circles JS at none against Blue Defense's 1. Circles JS also leads on update cadence (monthly vs every 3 months) and iOS requirement (9.0 vs 16.0). 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. Blue Defense sells 1 one-off in-app purchase. Circles JS asks for nothing beyond the download.

UpkeepUpdate frequency

Blue Defense ships an update every 3 months, Circles JS monthly. The most recent releases landed on November 1, 2026 and October 29, 2026 respectively.

Scorecard3 real differences · 7 level
Blue Defense versus Circles JS: the parameters behind the verdict, then further details
ParameterBlue DefenseCircles JS
PriceFreeFree
Rating4.3 (20 ratings) — better—
Positive reviews81.6% of reviews—
Number of ratings20 — better—
Update frequencyEvery 3 monthsMonthly — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPod
Requires iOS16.09.0 — better
Further details — not scored
Size16 MB11 MB
Age rating9+4+
DeveloperCat in a Box SoftwareGustav Fridell

In-app purchases

1 purchases

Blue Defense

One-time1
  • Full Content$1.99
None

Circles JS

No in-app purchases

Questions

Is Blue Defense free?
Blue Defense is free to download, with in-app purchases available.
Is Circles JS free?
Circles JS is free to download, with no in-app purchases.
Do Blue Defense or Circles JS have ads?
Neither Blue Defense nor Circles JS shows ads.
Which is updated more often, Blue Defense or Circles JS?
Blue Defense ships an update every 3 months, and Circles JS monthly. Most recently, Blue Defense was updated on November 1, 2026 and Circles JS on October 29, 2026.

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