Comparison

Number Sum Up vs Index Sums

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

Head to head
About

Number Sum Up

Solve number puzzles by circling and erasing digits to make rows and columns add up to target sums. This game offers a clean design and varying difficulty levels to sharpen your mental math skills.

Highlights
  • Circle and erase numbers
  • Solve row and column sum puzzles
  • Multiple difficulty levels
  • Varying board sizes
  • Hint system
  • Clean and simple design
Features
Read full description

Get ready to boost your brainpower and have a blast with Number Sum Up: Quick Math, the addictive math puzzle game that’s perfect for all ages! Number Sums is your ticket to mental math mastery! Solve puzzles by circling the right numbers and erasing the ones you don’t need. Your goal is to make each row and column add up to the clues on the side of the board. It’s simple, challenging, and oh-so-satisfying! Being good at mental math is useful in everyday life. Number Sum Up: Quick Math, you’ll find math puzzles that range from easy to hard. The game is simple to understand but takes careful thinking to solve. Playing these number games can help improve your math skills. If you enjoy number puzzles or free math games for adults, and want to practice your addition skills, try this fun and engaging game for hours of entertainment! How To Play: Circle the numbers that add up to the targets shown at the ends of each row and column. Use the toggle to change between circling and erasing. This helps you keep the right numbers and remove the extras. Each puzzle has only one solution. Make sure all rows and columns add up correctly. Practice addition with this free game, featuring different board sizes from 4x4 to 8x8 and varying difficulty levels. Tips to Improve Your Skills in Number Sum Up: Quick Math: Erase Large Numbers: First, remove numbers from the board that are bigger than the target sums. Odd and Even: If a row or column has only one odd number and the target sum is even, remove that odd number. Check Largest Number: If the biggest number on the board doesn’t match the target sum, add the smallest number to it. If the total is too high, erase the largest number. Benefits of Playing Number Sum Up: Quick Math: Enjoy many number puzzles that challenge your brain and improve your math skills. Experience a clean and simple design that makes playing enjoyable. Use hints when you get stuck to solve the puzzles. Play at your own pace and take your time to find the single correct solution. Why You’ll Love Number Sum Up: Quick Math: If you like addictive games like Number Match: Match Ten 10, you’ll love Number Sum Up: Quick Math. Play it anywhere, anytime to improve your math and logic skills!

About

Index Sums

Engage your mind with a Japanese number logic puzzle. Fill grids based on row and column sums, using pure logic to reveal hidden patterns. Offers multiple difficulty levels and daily challenges for continuous mental stimulation.

Highlights
  • Row and column sum logic puzzles
  • Multiple difficulty levels
  • Daily challenges
  • Progress tracking and statistics
  • Offline play
  • Customizable themes
  • Haptic feedback
Features
Read full description

Challenge your mind with Index Sums (Kakurasu), an elegant Japanese number logic puzzle that combines the best of Sudoku and Nonograms! HOW TO PLAY: • Fill in the grid based on row and column sums • Use logic to determine which cells should be filled • Complete the puzzle to reveal a hidden pattern • No guessing required - pure logic and deduction! KEY FEATURES: • Multiple difficulty levels (Easy, Medium, Hard) • Daily challenges to keep your mind sharp • Track your progress and statistics • Beautiful, minimalist design • Dark mode support • Offline play capability • Customizable themes and colors • Haptic feedback for better interaction BENEFITS: • Mental Agility: Challenge your logical thinking and problem-solving skills • Focus & Concentration: Practice maintaining focus through engaging puzzles • Pattern Recognition: Develop your ability to spot patterns and make quick decisions • Stress Relief: A relaxing way to unwind while keeping your mind active • Daily Challenge: Build a fun routine with daily puzzles • Progress Tracking: Monitor your improvement over time GAME MODES: • Classic Mode: Solve at your own pace • Daily Puzzles: New challenges every day • Practice Mode: Learn the basics FEATURES: • Intuitive touch controls • Haptic feedback • Progress tracking and statistics • Level progression system • Share your achievements • No ads or interruptions • Regular updates with new features Whether you're a puzzle enthusiast or looking to improve your logical thinking, Index Sums offers the perfect blend of challenge and satisfaction. Download now and join thousands of players in this addictive number logic puzzle!

Screenshots

Number Sum Up4 screens
Index Sums4 screens

Verdict

The call

The clearest difference is in-app purchases: Index Sums at none against Number Sum Up's 1. Index Sums also leads on rating (5.0 vs 4.6). Number Sum Up's advantage is update cadence (every 3 days vs every 3 weeks) and ratings volume (19 vs 3). On price, review sentiment, ads 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. Number Sum Up sells 1 one-off in-app purchase. Index Sums asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Index Sums holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Number Sum Up has 19 ratings behind it against 3, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

Number Sum Up ships an update every 3 days, Index Sums every 3 weeks. The most recent releases landed on October 13, 2026 and October 9, 2026 respectively.

Scorecard6 real differences · 4 level
Number Sum Up versus Index Sums: the parameters behind the verdict, then further details
ParameterNumber Sum UpIndex Sums
PriceFreeFree
Rating4.6 (19 ratings)5.0 (3 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings19 — better3
Update frequencyEvery 3 days — betterEvery 3 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better17.6
Further details — not scored
Size197 MB25 MB
Age rating4+4+
DeveloperALICE GAMESZORIX LLC

Customer experience

Number Sum Up

All ratings19 ratings
Positive94.7%
Neutral0.0%
Negative5.3%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Index Sums

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

Number Sum Up

One-time1
  • Remove Ads$3.99
None

Index Sums

No in-app purchases

Questions

Is Number Sum Up free?
Number Sum Up is free to download, with in-app purchases available.
Is Index Sums free?
Index Sums is free to download, with no in-app purchases.
Which has better reviews, Number Sum Up or Index Sums?
Index Sums is rated higher. Number Sum Up averages 4.6 out of 5 from 19 ratings, while Index Sums averages 5.0 from 3 ratings.
Do Number Sum Up or Index Sums have ads?
Neither Number Sum Up nor Index Sums shows ads.
Which is updated more often, Number Sum Up or Index Sums?
Number Sum Up ships an update every 3 days, and Index Sums every 3 weeks. Most recently, Number Sum Up was updated on October 13, 2026 and Index Sums on October 9, 2026.

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