The Jerks vs RYUKIN
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
The Jerks
Experience a live motion capture experiment with quirky characters. Watch as they hilariously attempt to replicate human movements in entertaining ways.
- Live motion capture
- Jerky character animations
- Mimics human movements
- Entertaining experiments
- Suitable for all ages
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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.
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.
- 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
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~ 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
Verdict
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
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.
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.
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.
| Parameter | The Jerks | RYUKIN |
|---|---|---|
| Price | Free — better | $3.49 |
| Rating | 4.2 (5 ratings) | 4.9 (62 ratings) — better |
| Positive reviews | — | 94.0% of reviews |
| Number of ratings | 5 | 62 — better |
| Update frequency | Every 2 days — better | Every 8 days |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 60 MB | 229 MB |
| Age rating | 4+ | 4+ |
| Developer | IORAMA AB | Masataka Hakozaki |
Customer experience
The Jerks
RYUKIN
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
The Jerks
No in-app purchases
RYUKIN
- ROBO FISH 02$1.99
- GHOST TRANSLUCENT$1.99
- GHOST BLACK$1.99
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- 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









