Choose My Koi
Choose My Koi if you want an Indie and Casual experience. My Koi launched in 2020.
My Koi vs Zen Aquarium
My Koi and Zen Aquarium both land in Simulation on Steam, which is why they keep getting compared. The comparison below is built from each game's Steam metadata — release year, genres, categories, Steam Deck status, price, and review score — refreshed daily by imho.run's scraper. Headline differences: Both are Simulation games on Steam. My Koi (2020) is 5 years older than Zen Aquarium (2025). My Koi scores higher on Steam reviews (95.2% positive) than Zen Aquarium (94.2% positive). No login or purchase needed — scroll for the full table, the verdict FAQ, and links to ranked similar games for both titles.
Which should you pick?
Choose Zen Aquarium
Choose Zen Aquarium if it's the newer release (2025) and ships with the modern feature baseline. Zen Aquarium launched in 2025.
Both My Koi and Zen Aquarium sit in Simulation on Steam, so either pick lands in the same broad neighborhood. Steam reviews are nearly tied (95.2% vs 94.2% positive), so genre fit is the cleanest tiebreaker — scroll the table for the feature-by-feature view.
Side-by-side comparison
 My Koi |  Zen Aquarium | |
|---|---|---|
| Released | 2020 | 2025 |
| Genres | Indie, Simulation, Casual | Simulation |
| Platforms | Windows | Windows, macOS |
| Steam Deck | Deck Unsupported | Deck Playable |
| Price | 4.99 USD | 4.99 USD |
| Steam reviews | 95.2% positive (291 reviews) | 94.2% positive (120 reviews) |
| Multiplayer | Single-player only | Single-player only |
| Developers | Sakana Studios | Astro Cat |
Side by side
- Both are Simulation games on Steam.
- My Koi (2020) is 5 years older than Zen Aquarium (2025).
- My Koi scores higher on Steam reviews (95.2% positive) than Zen Aquarium (94.2% positive).
- Zen Aquarium is currently ~0% cheaper on Steam than My Koi (4.99 USD vs. 4.99 USD).
- Steam Deck: My Koi is Deck Unsupported, Zen Aquarium is Deck Playable.
My Koi vs Zen Aquarium — FAQ
- Which is better, My Koi or Zen Aquarium?
- On Steam reviews the two are nearly tied: My Koi sits at 95.2% positive (291 reviews), Zen Aquarium at 94.2% (120). The choice usually comes down to genre fit and the platform features each one supports — see the comparison table above.
- Should I play My Koi or Zen Aquarium first?
- If you want chronology, My Koi (2020) came out before Zen Aquarium (2025). If neither is a sequel to the other, order doesn't really matter — start with whichever fits your current mood, since both share enough on Steam to make either a reasonable opener.
- Are My Koi and Zen Aquarium similar?
- They overlap on Simulation on Steam, so the catalogue groups them together — but "similar" depends on the specific mechanics. Use the genre + category rows above to decide whether the overlap matches what drew you to the one you've already played.