Comparison

Kepler Attack vs BoomCounter

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

Head to head
About

Kepler Attack

Engage in a retro arcade space shooter experience on your iPhone and Apple Watch. Destroy waves of alien invaders with power-ups and intuitive controls. Enjoy fast-paced gameplay perfect for short bursts of fun.

Highlights
  • Space shooter gameplay
  • Alien invasion waves
  • Power-ups (Shield, Triple Shot, etc.)
  • Apple Watch Crown controls
  • iPhone swipe controls
  • Retro arcade graphics
  • Short burst gameplay
Features
Read full description

Featured in Apple's "Great on watchOS 6" and "Our Favourite Apple Watch Apps" collections! #2 Casual Game in the US! Kepler Attack is an arcade game for your iPhone and Apple Watch. Fly through space and destroy waves of alien space invaders from Kepler-452b. “I’m just amazed that this is on my Watch.” - Tom, host of The Apple WatchCast Podcast - http://www.applewatchcast.com “I think this is actually my personal favorite new game now on the Apple Watch because of its really fast pacing which is perfect for these types of games.” - HotshotTek, 10 Awesome Apple Watch Games Apps of 2019 • Inspired by Gyruss, Galaga, Galaxian and Space Invaders! • Beautiful retro arcade graphics! • Fast paced alien attack waves with a variety of enemy space invaders! • Power-ups include Shield, Triple Shot, Rapid Fire and Smart Bomb! • Intuitive and simple controls using the Crown on the Watch! • Swipe to move on the iPhone! • Short burst gameplay is perfect for the Watch and iPhone! • Retro sound effects on the iPhone! • Play anywhere, anytime! • Includes Valentine's Day and Santa Christmas Holiday theme! • Runs at 60fps on the Watch! Relive the glory days of the arcade on your Apple Watch and iPhone. Thanks for playing Johnno & Pete

About

BoomCounter

Read full description

BoomCounter is a simple tactical counter for quickly planning energy use before an attack in strategy games. Tap gunboat abilities and hero abilities to calculate used energy, remaining energy, and the next energy cost for each ability. It helps you check whether your planned attack fits within your available energy before you start. Key features ・Automatic energy calculation ・Adjustable available energy ・Used and remaining energy display ・Usage count for each ability ・Next energy cost display ・One-tap repeat of your last attack plan ・Reset function ・Refined dark tactical interface This update improves the app’s stability by replacing the old online data loading system with fixed in-app data. The interface has also been redesigned to make important battle-planning information easier to read at a glance. No account or complicated setup is required. Open the app, tap the abilities you plan to use, and check your energy plan instantly. If you want to use the same pattern again, you can restore the previous plan with one button. BoomCounter is designed to make pre-attack planning faster, clearer, and more practical.

Screenshots

Kepler Attack4 screens

Verdict

The call

The clearest difference is price: BoomCounter at Free against Kepler Attack's $1.99. BoomCounter also leads on update cadence (every 2 weeks vs every 2 months) and iOS requirement (15.6 vs 17.0). Kepler Attack's advantage is chart position (#47 vs unranked). On ads, in-app purchases 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

BoomCounter is free to download; Kepler Attack costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Kepler Attack ships an update every 2 months, BoomCounter every 2 weeks. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

Scorecard4 real differences · 7 level
Kepler Attack versus BoomCounter: the parameters behind the verdict, then further details
ParameterKepler AttackBoomCounter
Price$1.99Free — better
Rating4.5 (943 ratings) — better—
Positive reviews81.4% of reviews—
Number of ratings943 — better—
Update frequencyEvery 2 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
Best chart rank#47 — better—
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod
Requires iOS17.015.6 — better
Further details — not scored
Size17 MB55 MB
Age rating4+4+
DeveloperRed Sprite StudiosSyuzou Hashimoto

Bugs and requests

Kepler Attack

Reported bugs

5 issues
  • Game doesn't play complete rip off
  • Just says on the watch version that it has to be installed on my iPhone for it to work. It's installed on my iPhone. Doesn't work.
  • This seems like a good game but I don't see it on my watch.
  • I have the first version watch Apple one, and it does not work on the watch,And has offered me a refund, I appreciate it.
  • It won't download on my watch

Requested features

2 requests
  • Add a golden starship IF
  • Please add upgrades so we can have bettr ships

BoomCounter

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Kepler Attack

No in-app purchases

None

BoomCounter

No in-app purchases

Questions

Is Kepler Attack free?
Kepler Attack costs $1.99, with no in-app purchases.
Is BoomCounter free?
BoomCounter is free to download, with no in-app purchases.
Do Kepler Attack or BoomCounter have ads?
Neither Kepler Attack nor BoomCounter shows ads.
Which is updated more often, Kepler Attack or BoomCounter?
Kepler Attack ships an update every 2 months, and BoomCounter every 2 weeks. Most recently, Kepler Attack was updated on November 6, 2026 and BoomCounter on November 3, 2026.

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