Comparison

The Jerks vs RYUKIN

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

Head to head
About

The Jerks

Experience a live motion capture experiment with quirky characters. Watch as they hilariously attempt to replicate human movements in entertaining ways.

Highlights
  • Live motion capture
  • Jerky character animations
  • Mimics human movements
  • Entertaining experiments
  • Suitable for all ages
Read full description

Here come The Jerks, a live motion capture experiment for everyone! A selection of jerky characters try their best to mimic the movements of real humans in surprising and entertaining ways.

About

RYUKIN

Experience the serene beauty of a virtual goldfish aquarium. Customize your tank, interact with the fish, and enjoy soothing sounds. Features a special mode for young children and a sleep timer for relaxation.

Highlights
  • Interactive goldfish that respond to touch
  • Customizable tank shape and background
  • Soothing water sounds and visuals
  • Cat & Baby Mode for safe play
  • Sleep timer for bedtime
  • Clock and date display
Features
Read full description

~ Gracefully Fluttering Goldfish ~ Goldfish glide gracefully through crystal-clear water, their fins fluttering gently as they swim. Their charming gestures and soft, delicate fin movements have been carefully recreated. Enjoy the beauty of goldfish anytime, anywhere — without the need for water changes or feeding. App Highlights - Fish respond to your touch and follow your finger - Customize tank shape, background color, and floating objects - Soothing water sounds and clear, refreshing visuals - "Cat & Baby Mode" for safe play with kittens and toddlers - Sleep timer for relaxing bedtime use - Play your favorite music while watching the aquarium - Clock and date display - White and black goldfish included; colorful and themed fish available via in-app purchase Settings & Customization - Camera options (Free position / Follow fish / Auto-rotation) - Screen orientation - Tilt sensitivity - Sleep timer - UI size - Toggle water surface, bubbles, and other effects - Adjust brightness, saturation, contrast, and color tone - Quality settings (resolution and various effects) - Volume settings (water sounds, bubble sounds) - Clock & date options (font, position, size) Other Features - Fish, objects, and the water surface respond to touch and device tilt - Fish may whimsically swim toward your finger - Tap too much and the fish may faint! - Feed the fish - Adjust the size of fish and objects - Display up to six fish at once ‥∴ Bringing the Allure of Goldfish Closer ∴‥ This app was born from a childhood dream of recreating goldfish through programming. Fifteen years after the release of the original app *Wa Kingyo*, countless refinements have been made to capture the graceful and charming nature of these fish. From the gentle movement of their fins to the way they chase and munch on food, experience the beauty and warmth that goldfish bring. News and Support X: @m_hakozaki TikTok: @m_hakozaki Instagram: @masataka.hakozaki

Screenshots

The Jerks4 screens
RYUKIN4 screens

Verdict

The call

The clearest difference is price: The Jerks at Free against RYUKIN's $3.49. The Jerks also leads on in-app purchases (none vs 10) and update cadence (every 2 days vs every 8 days). RYUKIN's advantage is rating (4.9 vs 4.2) and ratings volume (62 vs 5). On ads, 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

The Jerks is free to download; RYUKIN costs $3.49 up front. RYUKIN sells 10 one-off in-app purchases. The Jerks asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

RYUKIN holds the better App Store score, 4.9 against 4.2. That said, the two scores are not equally well evidenced: RYUKIN has 62 ratings behind it against 5, so its average is the more settled of the two.

UpkeepUpdate frequency

The Jerks ships an update every 2 days, RYUKIN every 8 days. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

Scorecard6 real differences · 4 level
The Jerks versus RYUKIN: the parameters behind the verdict, then further details
ParameterThe JerksRYUKIN
PriceFree — better$3.49
Rating4.2 (5 ratings)4.9 (62 ratings) — better
Positive reviews—94.0% of reviews
Number of ratings562 — better
Update frequencyEvery 2 days — betterEvery 8 days
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better16.0
Further details — not scored
Size60 MB229 MB
Age rating4+4+
DeveloperIORAMA ABMasataka Hakozaki

Customer experience

The Jerks

All ratings5 ratings
Positive80.0%
Neutral0.0%
Negative20.0%

RYUKIN

All ratings62 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews100 reviews
Positive94.0%
Neutral0.0%
Negative6.0%

Bugs and requests

The Jerks

Not enough reviews yet to summarise bugs or requests.

RYUKIN

Reported bugs

1 issue
  • Occasional crashing on high-end devices

Requested features

5 requests
  • Ability to change fish colors
  • Add more fish species (e.g. bettas, tetras)
  • Implement fish breeding/growth mode
  • Allow customizing fish placement in tank
  • Add desktop/widget mode for always-on display

In-app purchases

None

The Jerks

No in-app purchases

10 purchases

RYUKIN

One-time10
  • ROBO FISH 02$1.99
  • GHOST TRANSLUCENT$1.99
  • GHOST BLACK$1.99
Show 7 more
  • RED RYUKIN$1.99
  • RED-WHITE RYUKIN$1.99
  • CALICO RED/WHITE/BLACK$1.99
  • YELLOW GOLD RYUKIN$1.99
  • CALICO KITTY FISH$1.99
  • SKELETON FISH$1.99
  • PANDA TELESCOPE$1.99

Questions

Is The Jerks free?
The Jerks is free to download, with no in-app purchases.
Is RYUKIN free?
RYUKIN costs $3.49, and also offers in-app purchases.
Which has better reviews, The Jerks or RYUKIN?
RYUKIN is rated higher. The Jerks averages 4.2 out of 5 from 5 ratings, while RYUKIN averages 4.9 from 62 ratings.
Do The Jerks or RYUKIN have ads?
Neither The Jerks nor RYUKIN shows ads.
Which is updated more often, The Jerks or RYUKIN?
The Jerks ships an update every 2 days, and RYUKIN every 8 days. Most recently, The Jerks was updated on November 3, 2026 and RYUKIN on November 4, 2026.

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