OKO vs Perfect Sum
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
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.
- Hypnotizing puzzle gameplay
- NASA satellite imagery
- Otherworldly soundscapes
- Retina graphics
- Increasingly complex patterns
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* 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
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.
- Strategic shape placement
- Numbered board puzzles
- Unlockable buildings
- Increasing difficulty levels
- Rewarding animations
- Stunning visuals
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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
Verdict
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
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.
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.
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.
| Parameter | OKO | Perfect Sum |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 4.0 (3 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 71.4% of reviews | 100.0% of reviews — better |
| Number of ratings | 3 — better | 2 |
| Update frequency | Every 44 months | Every 3 days — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Paid | Ad-supported — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 55 MB | 139 MB |
| Age rating | 4+ | 4+ |
| Developer | Playables | Benjamin Richy |
Customer experience
OKO
Perfect Sum
In-app purchases
OKO
No in-app purchases
Perfect Sum
No in-app purchases









