Comparison

N'Back Butterfly vs GLURMB!

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

Head to head

Customizable snake game

Free

🎮 Games

★ 4.01 ratingsView app →

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

GLURMB!

Features

Read full description

GLURMB! is a fun snake game. Choose speed, gamefield size, snake appearance, and reward appearance to customize your play. Levels and points increase as you go - see how high you can get!

Screenshots

N'Back Butterfly2 screens

GLURMB!2 screens

Verdict

The call

The clearest difference is ads: GLURMB! at none against N'Back Butterfly's shown. N'Back Butterfly's advantage is update cadence (every 10 months vs every 40 months). On price, in-app purchases, 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

N'Back Butterfly ships an update every 10 months, GLURMB! every 40 months. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

Scorecard2 real differences · 8 level

N'Back Butterfly versus GLURMB!: the parameters behind the verdict, then further details
Parameter	N'Back Butterfly	GLURMB!
Price	Free	Free
Rating	—	4.0 (1 ratings) — better
Positive reviews	100.0% of reviews	—
Number of ratings	—	1 — better
Update frequency	Every 10 months — better	Every 40 months
Ads	Yes	No — better
In-app purchases	No	No
Monetization	Ad-supported	—
Devices	iPhone, iPad, iPod	iPhone, iPad, iPod
Requires iOS	15.6	14.0 — better
Further details — not scored
Size	9 MB	1 MB
Age rating	4+	4+
Developer	Yasuyoshi Ota	Jonah Scheib

In-app purchases

None

N'Back Butterfly

No in-app purchases

None

GLURMB!

No in-app purchases

Questions

Is N'Back Butterfly free?

N'Back Butterfly is free to download, with no in-app purchases.

Is GLURMB! free?

GLURMB! is free to download, with no in-app purchases.

Do N'Back Butterfly or GLURMB! have ads?

N'Back Butterfly shows ads; GLURMB! does not.

Which is updated more often, N'Back Butterfly or GLURMB!?

N'Back Butterfly ships an update every 10 months, and GLURMB! every 40 months. Most recently, N'Back Butterfly was updated on October 25, 2026 and GLURMB! on October 24, 2026.