marimo vs Amazing Aquarium
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
marimo
A virtual pet simulation where you nurture a Marimo, a unique aquatic plant from Hokkaido. The core gameplay involves changing its water to help it grow. You can then share your Marimo's progress with friends.
- Virtual Marimo pet
- Water changing gameplay
- Marimo growth simulation
- Share progress on Twitter
- Hokkaido souvenir theme
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Marimo-chan is an application to grow the "Marimo" on the iPhone. Inhabit Lake Akan in Hokkaido, can be observed / breeding on the iPhone the "Marimo" very popular as a souvenir of Hokkaido. Is a very simple system. Basically all you have to do change water. When Marimo grow large then Let's boast to your friends on twitter
Amazing Aquarium
Organize your virtual aquarium by sorting incoming sea urchins and moss balls. Care for your creatures by keeping the tank clean and providing fresh water. This game combines quick-thinking reflex challenges with a relaxing creature-training experience.
- Sort sea urchins and moss balls
- Organize and grow virtual aquarium
- Tap or flick controls
- Keep aquarium clean
- Care for marine creatures
- Reflex and training gameplay
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Hit left for sea urchin and right for moss balls! Organize your aquarium and grow lovely moss balls! Moss balls are a fascinating form of marine life -- algae that grows into a velvety ball. They can only be found in Japan and some parts of Europe. Presenting an amazing fusion: a quick-thinking reflex game meets a slow-paced creature training game! Reflex game: -Tap or flick to sort the incoming sea urchin and moss balls! Aquarium game: -Grow sea urchin and moss balls in your very own aquarium -Keep that tank tidy! Add fresh water to your aquarium to keep it clean -Don't neglect your little creatures -- they'll shrivel up and die!
Screenshots
Verdict
The clearest difference is review sentiment: marimo at 98% against Amazing Aquarium's 53%. marimo also leads on in-app purchases (none vs 2) and iOS requirement (9.0 vs 13.0). On price, update cadence, ads and device support 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. Amazing Aquarium sells 2 one-off in-app purchases. marimo asks for nothing beyond the download.
Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on October 21, 2026 and October 19, 2026 respectively.
| Parameter | marimo | Amazing Aquarium |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.7 (3 ratings) — better |
| Positive reviews | 98.0% of reviews — better | 52.9% of reviews |
| Number of ratings | — | 3 — better |
| Update frequency | Every 4 months | Every 4 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 9.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 31 MB | 23 MB |
| Age rating | 4+ | 4+ |
| Developer | HANA-DA Hiromitsu | Masakazu Yonehara |
Customer experience
marimo
Amazing Aquarium
In-app purchases
marimo
No in-app purchases
Amazing Aquarium
- HP Boost$0.99
- Ever-Pure Water$0.99
Questions
Is marimo free?
Is Amazing Aquarium free?
Do marimo or Amazing Aquarium have ads?
Which is updated more often, marimo or Amazing Aquarium?
Other comparisons
