Comparison

N'Back Butterfly vs GridLock Numbers

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

Head to head
About

N'Back Butterfly

Enhance your cognitive abilities and combat forgetfulness with this application designed to improve working memory. It utilizes the scientifically recognized n-back task to train your brain's capacity for information recall and manipulation.

Highlights
  • Working memory improvement
  • N-back task training
  • Cognitive neuroscience assessment
  • Continuous performance task
Features
Read full description

Forget about forgetfulness! Improve your memory! Improve Working Memory using N'Back Butterfly. The n-back task is a continuous performance task that is commonly used as an assessment in cognitive neuroscience to measure a part of working memory. The n-back was introduced by Wayne Kirchner in 1958. [quoted from Wikipedia 2014-04-02]

About

GridLock Numbers

Features
Read full description

Rediscover a classic logic puzzle, beautifully redesigned for a captivating modern experience. If you love numbers and challenging puzzles, Gridlock Numbers is a perfect match for you. Fill grids by jumping from cell to cell, following two simple rules. Move horizontally or vertically by skipping two cells, and diagonally by skipping one. Avoiding gridlock and trying not to leave an empty box behind will challenge your mind. Starting with 5x5 grid in Level 1, there are too many paths to success and you need only one of them. Place 1 on any square and then put each next number skipping double spaces for horizontal or vertical moves, single space for diagonal moves. Plan your moves ahead, see open paths, and complete the grids! If stuck in gridlock, try other paths. Undo as many times as you want or restart the game. If totally stuck, challenge yourself with other grids using the crowns you collect. With each level you pass, game board gets bigger, but not necessarily harder. There is always an option to make it harder though. Choose difficulty ‘Hard' and let us randomly decide the first cell to place 1 for you. Each number adds 10 times its value to the score. This is doubled in ‘hard’ mode. Plus, there are ‘x2' cells to get higher points and a chance to compete with top gamers on leaderboards in Game Center. • All in all, there are 6 levels with 5x5, 6x6, 7x7, 8x8, 9x9, and 10x10 sized tables. • You pass a level if you succeed placing numbers 25, 36, 49, 64, 81 and 100, respectively. • You are rewarded crowns if you can manage to put 24, 35, 48, 63, 80 and 99 even if you cannot reach the last number. If you would like to spend your time on a puzzle as compelling as Sudoku and 2048, give it a try! Can you master the grid? Good luck solving GridLock Numbers!

Screenshots

N'Back Butterfly2 screens
GridLock Numbers3 screens

Verdict

The call

The clearest difference is in-app purchases: N'Back Butterfly at none against GridLock Numbers's 4. GridLock Numbers's advantage is ads (none vs shown) and update cadence (every 6 weeks vs every 10 months). On price, device support and iOS requirement 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. GridLock Numbers sells 4 one-off in-app purchases. N'Back Butterfly asks for nothing beyond the download.

UpkeepUpdate frequency

N'Back Butterfly ships an update every 10 months, GridLock Numbers every 6 weeks. The most recent releases landed on August 31, 2026 and September 7, 2026 respectively.

Scorecard3 real differences · 5 level
N'Back Butterfly versus GridLock Numbers: the parameters behind the verdict, then further details
ParameterN'Back ButterflyGridLock Numbers
PriceFreeFree
Positive reviews100.0% of reviews—
Update frequencyEvery 10 monthsEvery 6 weeks — better
AdsYesNo — better
In-app purchasesNo — betterYes
MonetizationAd-supported—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.6 — better16.2
Further details — not scored
Size9 MB5 MB
Age rating4+4+
DeveloperYasuyoshi OtaAycan YILMAZ

In-app purchases

None

N'Back Butterfly

No in-app purchases

4 purchases

GridLock Numbers

One-time4
  • Pack of 10 Crowns$0.99
  • Pack of 30 Crowns$1.99
  • Pack of 60 Crowns$2.99
Show 1 more
  • Pack of 120 Crowns$3.99

Questions

Is N'Back Butterfly free?
N'Back Butterfly is free to download, with no in-app purchases.
Is GridLock Numbers free?
GridLock Numbers is free to download, with in-app purchases available.
Do N'Back Butterfly or GridLock Numbers have ads?
N'Back Butterfly shows ads; GridLock Numbers does not.
Which is updated more often, N'Back Butterfly or GridLock Numbers?
N'Back Butterfly ships an update every 10 months, and GridLock Numbers every 6 weeks. Most recently, N'Back Butterfly was updated on August 31, 2026 and GridLock Numbers on September 7, 2026.

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