The Marimo vs Jellyfish Simulator
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
The Marimo
Care for a virtual green ball creature that grows over time. Keep its environment clean and provide light to ensure its survival. Customize its appearance and interact with it through various gestures.
- Virtual pet care
- Growth simulation
- Environment maintenance
- Customization options
- Interactive controls
- Social sharing
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Thank you 1,130,000 download!! [About Marimo] Marimo means a plant like a green ball which grow in Hokkaido, Japan. You can raise a Marimo. A marimo will grow up little by little every day. When water become dirty, you need to refresh water. If you don't take care of a Marimo long time, Marimo will wither. [Other Features] - You can rename Marimo, and change background. - Drag to move Marimo. - Double tap to pick tap Marimo. - Rotate marimo with two finger. - Marimo moves by the direction of the device. - You can upload image of Marimo on Twitter/Facebook. - Photosynthesis occurs in a bright place.
Jellyfish Simulator
Care for virtual jellyfish by cleaning their tank and circulating water. New jellyfish will appear and grow, with six types available. Play data is automatically saved to iCloud and accessible on other devices, including Apple Watch.
- Jellyfish growth simulation
- Tank cleaning mechanics
- Multiple jellyfish types
- iCloud data saving
- Apple Watch companion app
- AR/VR 3D viewing
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This is a jellyfish simulator. Circulate(swipe screen) and clean the tank(swipe yellow dirts), then new jellyfish will appear and they'll grow. There are 6 kinds of jellyfish so far. Long Tap screen to show menu. This app saves play data to iCloud in every two minutes automatically. Saved data can be downloaded on new install to another iPhone/iPad. You can also download saved data via Jellyfish AR/VR for 3D viewing!! Apple Watch app shows screenshots of your own jellyfishes on your wrist!!
Screenshots
Verdict
The Marimo and Jellyfish Simulator both sit at 4.4 stars, but that hides the real split: 80% of The Marimo's written reviews are positive against 50% of Jellyfish Simulator's. Jellyfish Simulator's advantage is device support (4 vs 2) and iOS requirement (12.0 vs 15.6). On price, rating, ratings volume and update cadence 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.4 for The Marimo against 4.5 for Jellyfish Simulator. Both are backed by a comparable volume of ratings — 16 and 6 respectively. Written reviews are what separate them: 80% of The Marimo's written reviews are positive against 50% of Jellyfish Simulator's.
Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on September 29, 2026 and September 17, 2026 respectively.
| Parameter | The Marimo | Jellyfish Simulator |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (16 ratings) | 4.5 (6 ratings) — better |
| Positive reviews | 79.6% of reviews — better | 50.0% of reviews |
| Number of ratings | 16 — better | 6 |
| Update frequency | Every 3 months | Every 3 months |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Monetization | Ad-supported | Ad-supported |
| Devices | iPhone, iPod | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 15.6 | 12.0 — better |
| Further details — not scored | ||
| Size | 18 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Kosuke Ogawa | KENSHI DOI |
Customer experience
The Marimo
Jellyfish Simulator
In-app purchases
The Marimo
No in-app purchases
Jellyfish Simulator
No in-app purchases
Questions
Is The Marimo free?
Is Jellyfish Simulator free?
Which has better reviews, The Marimo or Jellyfish Simulator?
Do The Marimo or Jellyfish Simulator have ads?
Which is updated more often, The Marimo or Jellyfish Simulator?
Other comparisons
