Comparison

Zero/Sum 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

Zero/Sum

Solve mathematical puzzles to uncover a cure for cancer in this unique puzzle game. Experience an 80s action movie-inspired storyline with live-action cinematics and a variety of fresh puzzle mechanics. Features daily challenges and time trials.

Highlights
  • Unique and original puzzle gameplay
  • 80s action movie-inspired storyline
  • Full motion video cinematics with real actors
  • Variety of puzzle types (melting, number)
  • Daily Challenge Mode with new puzzles
  • Time Trial mode
Features
Read full description

On the eve of discovering a mathematical cure for cancer, your mentor, Professor Claire Liddy, is murdered. Fortunately, before she died, the Professor was able to erase many of the plus and minus signs with her bloody hands, saving the cure from falling into the hands of her killers. Now it is up to you to fill back in the missing parts of the equation and resolve your professor's cure. It's up to you to cure cancer -- AGAIN! (It's a comedy). FEATURES - A completely UNIQUE and ORIGINAL puzzle game! - Puzzle gameplay that will make you feel and look SMART! - A thrilling, 80s ACTION MOVIE-inspired storyline! - Full motion video GREEN SCREEN cinematics! With REAL human ACTORS! - NO mention of CANDY or CUPCAKES or sweets of any kind in the story at all! - A variety of different puzzle types and mechanics to keep things FRESH (melting puzzles, number puzzles, and so much more)! - A Daily Challenge Mode featuring 10 NEW puzzles EVERY DAY! - Time Trial mode - try to beat your best time on RANDOM PUZZLES! - Completely INDEPENDENTLY developed and published! (Support your local punk band)! I ignored my newborn child to make this game, please ignore yours to play it!* *Note: I worked on the game every night after my son fell asleep, there is nothing more important to me than being a father. That being said, this game is a CLOSE second. Like neck and neck, really.

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

Zero/Sum4 screens
Perfect Sum4 screens

Verdict

The call

The clearest difference is review sentiment: Perfect Sum at 100% against Zero/Sum's 54%. Perfect Sum also leads on rating (5.0 vs 4.2) and update cadence (every 3 days vs every 2 months). Zero/Sum's advantage is ads (none vs shown) and ratings volume (27 vs 2). On price, 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

Both are free to download. 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 4.2. That said, the two scores are not equally well evidenced: Zero/Sum has 27 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 54% of Zero/Sum's written reviews are positive against 100% of Perfect Sum's.

UpkeepUpdate frequency

Zero/Sum ships an update every 2 months, Perfect Sum every 3 days. The most recent releases landed on November 2, 2026 and November 4, 2026 respectively.

Scorecard7 real differences · 3 level
Zero/Sum versus Perfect Sum: the parameters behind the verdict, then further details
ParameterZero/SumPerfect Sum
PriceFreeFree
Rating4.2 (27 ratings)5.0 (2 ratings) — better
Positive reviews53.8% of reviews100.0% of reviews — better
Number of ratings27 — better2
Update frequencyEvery 2 monthsEvery 3 days — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree — betterAd-supported
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS8.0 — better12.0
Further details — not scored
Size973 MB139 MB
Age rating12+4+
DeveloperSean KearneyBenjamin Richy

Customer experience

Zero/Sum

All ratings27 ratings
Positive77.8%
Neutral7.4%
Negative14.8%
Written reviews13 reviews
Positive53.8%
Neutral23.1%
Negative23.1%

Perfect Sum

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

In-app purchases

None

Zero/Sum

No in-app purchases

None

Perfect Sum

No in-app purchases

Questions

Is Zero/Sum free?
Zero/Sum is free to download, with no in-app purchases.
Is Perfect Sum free?
Perfect Sum is free to download, with no in-app purchases.
Which has better reviews, Zero/Sum or Perfect Sum?
Perfect Sum is rated higher. Zero/Sum averages 4.2 out of 5 from 27 ratings, while Perfect Sum averages 5.0 from 2 ratings.
Do Zero/Sum or Perfect Sum have ads?
Perfect Sum shows ads; Zero/Sum does not.
Which is updated more often, Zero/Sum or Perfect Sum?
Zero/Sum ships an update every 2 months, and Perfect Sum every 3 days. Most recently, Zero/Sum was updated on November 2, 2026 and Perfect Sum on November 4, 2026.

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