Comparison

OKO⁢ vs Perfect Sum

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

Head to head
About

OKO⁢

A captivating puzzle game that transforms NASA satellite images into a cosmic visual and auditory experience. Reconstruct images by precisely stopping rotating circular pieces, with increasingly complex patterns and otherworldly soundscapes.

Highlights
  • Hypnotizing puzzle gameplay
  • NASA satellite imagery
  • Otherworldly soundscapes
  • Retina graphics
  • Increasingly complex patterns
Features
Read full description

* Swisscom App of the Year 2012 OKO is a hypnotising puzzle game that turns satellite images taken from the NASA database into a mesmerising journey around the Planet. The game's rich otherworldly soundscapes are composed from recordings taken aboard space shuttles. The goal is to reconstruct an image by stopping rotating circles cut out from the image. For each level, the animated pieces draw increasingly complex patterns. The challenge is to be attentive to image juxtapositions in order to stop each circles movement at the right moment. Now available on the App Store with retina graphics! "Beautiful. Engaging. Excellent transmedia incorporation of space imagery.” – Yvonne Clearwater, New Media Innovation Leader at NASA / Ames Research Center

About

Perfect Sum

A captivating puzzle game where you strategically place shapes on a numbered board to reach a perfect sum. Unlock new buildings and enjoy stunning visuals and rewarding animations as you progress through increasingly challenging levels.

Highlights
  • Strategic shape placement
  • Numbered board puzzles
  • Unlockable buildings
  • Increasing difficulty levels
  • Rewarding animations
  • Stunning visuals
Features
Read full description

Welcome to Perfect Sum, a mesmerizing mobile game that combines the beauty of animation with the excitement of strategic gameplay! Place shapes on a numbered board to achieve the perfect sum, navigating through levels that range from deceptively simple to devilishly difficult. With every shape placed, you're not just solving a puzzle; you're painting a masterpiece of numbers and strategy. As you elevate your high score, you unlock a world of wonders, with new buildings revealing themselves, adding layers of depth to the gameplay and a sense of achievement that keeps you coming back for more. With stunning visuals, fluid animations, each moment in the game is designed to be a feast for the senses. From the satisfying click of placing a shape to the vibrant explosion of achieving the perfect sum, the game ensures every action feels rewarding.

Screenshots

OKO⁢4 screens
Perfect Sum4 screens

Verdict

The call

The clearest difference is price: Perfect Sum at Free against OKO⁢'s $3.99. Perfect Sum also leads on rating (5.0 vs 4.0) and update cadence (every 3 days vs every 44 months). OKO⁢'s advantage is ads (none vs shown). On ratings volume, 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

Perfect Sum is free to download; OKO⁢ costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Perfect Sum holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 3 and 2 respectively. Written reviews point the same way: 71% of OKO⁢'s written reviews are positive against 100% of Perfect Sum's.

UpkeepUpdate frequency

OKO⁢ ships an update every 44 months, Perfect Sum every 3 days. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

Scorecard7 real differences · 3 level
OKO⁢ versus Perfect Sum: the parameters behind the verdict, then further details
ParameterOKO⁢Perfect Sum
Price$3.99Free — better
Rating4.0 (3 ratings)5.0 (2 ratings) — better
Positive reviews71.4% of reviews100.0% of reviews — better
Number of ratings3 — better2
Update frequencyEvery 44 monthsEvery 3 days — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationPaidAd-supported — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS14.012.0 — better
Further details — not scored
Size55 MB139 MB
Age rating4+4+
DeveloperPlayablesBenjamin Richy

Customer experience

OKO⁢

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews21 reviews
Positive71.4%
Neutral4.8%
Negative23.8%

Perfect Sum

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

OKO⁢

No in-app purchases

None

Perfect Sum

No in-app purchases

Questions

Is OKO⁢ free?
OKO⁢ costs $3.99, with no in-app purchases.
Is Perfect Sum free?
Perfect Sum is free to download, with no in-app purchases.
Which has better reviews, OKO⁢ or Perfect Sum?
Perfect Sum is rated higher. OKO⁢ averages 4.0 out of 5 from 3 ratings, while Perfect Sum averages 5.0 from 2 ratings.
Do OKO⁢ or Perfect Sum have ads?
Perfect Sum shows ads; OKO⁢ does not.
Which is updated more often, OKO⁢ or Perfect Sum?
OKO⁢ ships an update every 44 months, and Perfect Sum every 3 days. Most recently, OKO⁢ was updated on November 1, 2026 and Perfect Sum on November 4, 2026.

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