Zen Aquarium

Released Sep 2025

Immerse yourself in the ultimate relaxing aquarium experience. Watch fish glide gracefully through a serene, ever-changing tank—no setup, no stress, just pure tranquility. Enjoy soothing visuals and ambient ASMR sounds as your aquarium comes to life effortlessly. Your peaceful escape awaits!

93% positive · 308 reviews

Done

All announced content has been released

Medium confidence

Done

All announced content has been released

Medium confidence

Where to buy

Steam Updated 12 Oct 2026 $4.99

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Evaluation

Zen Aquarium launched on September 25, 2025 as a complete relaxation/idle experience. After launch, the developer shipped one feature patch on December 16, 2025, adding an auto-save system, a saltwater tank theme, a new Butterflyfish species, new achievements, and UI refinements. That patch represents the only post-launch update on record. There are no unreleased DLC listings, no announced future content, and no developer roadmap pointing to additional updates. The game was marketed and released as a finished product — a calm, ambient aquarium experience — and the post-launch patch appears to have been a polish update rather than part of a planned content series. The developer has not communicated any plans for further updates since December 16, 2025, which is now over six months ago. With no content commitments outstanding and no sustained update pattern established, the game appears to have shipped as a complete product.

Evidence

Zen Aquarium officially launched on Steam and Mac as a passion project focused on relaxation and ASMR.

news post · Sep 25, 2025 source content shipped

high

Post-launch feature patch added auto-save, a saltwater tank with new fish, new achievements, and UI improvements. This is the last known developer communication.

news post · Dec 16, 2025 source content shipped

medium

Media

Details

Developer

Astro Cat

Publisher

Astro Cat

Achievements

Platform

Windows, macOS

Controller

—

Steam Deck

Playable

Players

Single-player

Simulation Underwater Cozy Relaxing Idler Nature Casual Colorful Creature Collector Utilities Fishing Procedural Generation Immersive Sim Cute Realistic

About this game

Step into a world of serene underwater beauty with Zen Aquarium, the ultimate idle fish tank experience inspired by classic aquarium screensavers. No complex setups, no management stress, just pure visual enjoyment as a thriving aquatic world unfolds before your eyes. Perfect for ASMR lovers, chill gamers, and anyone who wants a peaceful, living desktop companion.

❗ Disclaimer: Zen Aquarium does not support ultrawide resolutions (21:9, 32:9)

🐠 Watch Your Aquarium Come to Life

New fish spawn and gracefully swim through your tank at regular intervals, creating an ever-evolving scene of harmony and tranquility. With simple and unique aquarium setups and many mesmerizing fish species, no two moments are ever the same.

🌊 The Ultimate Zen & ASMR Experience

Designed for relaxation and mindfulness, Zen Aquarium offers a soothing escape from the noise of everyday life. Let the gentle motion of fish, the soft bubbling of water, and the ambient aquatic sounds create a perfect stress-free atmosphere.

🐟 Endless Combinations, Infinite Possibilities

Customize your perfect aquatic atmosphere with a wide selection of ambient sounds and calming music. Whether you prefer gentle rainfall, soft wind, or even cozy cat purring, Zen Aquarium gives you full control. Mix and layer audio to create a unique soundscape that suits your mood—ideal for subtle background ambiance or full sensory immersion. Every session is a chance to discover a new combination, making each visit to your aquarium uniquely relaxing.

🌿 No Stress, Just Serenity

Unlike traditional aquarium sims, Zen Aquarium is all about relaxation, not management. There’s no need to feed fish, clean tanks, or adjust water levels—just sit back, unwind, and enjoy the mesmerizing world beneath the surface.