Comparison

Zero/Sum vs Sum Loop

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

Sum Loop

A challenging puzzle game where players place blocks into overlapping loops to match displayed sums. Offers multiple solutions for each puzzle, providing replayability. Designed for quick, engaging gameplay.

Highlights
  • Match sums in overlapping loops
  • Place blocks to solve puzzles
  • Multiple solutions per puzzle
  • Challenging gameplay
  • Intuitive block placement
Features
Read full description

Number will be added to all loops where the loops are overlapped. Put the blocks in the loops and match all the sums displayed above. There is more than 1 answer.

Screenshots

Zero/Sum4 screens
Sum Loop4 screens

Verdict

The call

The clearest difference is rating: Sum Loop at 5.0 against Zero/Sum's 4.2. Zero/Sum's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price, update cadence 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. Sum Loop sells 1 one-off in-app purchase. Zero/Sum asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Sum Loop 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 1, so its average is the more settled of the two.

UpkeepUpdate frequency

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

Scorecard6 real differences · 4 level
Zero/Sum versus Sum Loop: the parameters behind the verdict, then further details
ParameterZero/SumSum Loop
PriceFreeFree
Rating4.2 (27 ratings)5.0 (1 ratings) — better
Positive reviews53.8% of reviews—
Number of ratings27 — better1
Update frequencyEvery 2 months — betterEvery 4 months
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS8.0 — better14.0
Further details — not scored
Size973 MB9 MB
Age rating12+4+
DeveloperSean KearneyGoro Sato

Customer experience

Zero/Sum

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

Sum Loop

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Zero/Sum

No in-app purchases

1 purchases

Sum Loop

One-time1
  • Remove Ads$0.99

Questions

Is Zero/Sum free?
Zero/Sum is free to download, with no in-app purchases.
Is Sum Loop free?
Sum Loop is free to download, with in-app purchases available.
Which has better reviews, Zero/Sum or Sum Loop?
Sum Loop is rated higher. Zero/Sum averages 4.2 out of 5 from 27 ratings, while Sum Loop averages 5.0 from 1 ratings.
Do Zero/Sum or Sum Loop have ads?
Sum Loop shows ads; Zero/Sum does not.
Which is updated more often, Zero/Sum or Sum Loop?
Zero/Sum ships an update every 2 months, and Sum Loop every 4 months. Most recently, Zero/Sum was updated on November 2, 2026 and Sum Loop on November 3, 2026.

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