Fishtank vs Cuboo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fishtank
Enhance your concentration with a unique approach to productivity. This app gamifies focus sessions, allowing you to build a virtual aquarium filled with discovered fish. Earn rewards and track your progress as you stay on task.
- Customizable focus session lengths
- App blocking for distraction prevention
- Ambient background options
- Progress tracking
- Earn mystery lootboxes
- Discover and collect rare fish
- Virtual aquarium simulation
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Dive into a new way of staying focused with Fishtank, where every focused moment helps you build your own mesmerizing aquatic world. This isn't just another focus app – it's a delightful blend of productivity and collection that turns your dedication into discovery. - Choose your focus session length - App blocking feature keeps you on track - Beautiful ambient backgrounds - Elegant progress tracking - Earn mystery lootboxes upon completing focus sessions - Discover fish of varying rarities - Watch your collected fish swim freely in your tank
Cuboo
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Cuboo turns focus into a journey, built around the hyperfocus technique. Start a session and you board a train. As you work, it glides across Europe in real time — forests, mountains, and coastline drifting past your window. Stay on track and you arrive at a new capital, earning a stamp for your passport. Get distracted, and the train waits. THE HYPERFOCUS TECHNIQUE Hyperfocus is the state of complete, single-task immersion — where time falls away and your best work happens. Cuboo is designed to pull you into it and keep you there: one task, one train, one destination, with no notifications to break the spell. Instead of a timer counting down, you have somewhere to be. HOW IT WORKS • Pick what you're focusing on — deep work, study, reading, creating, anything. • Choose how far you're going, and board. • Block the apps that pull you away for the length of the ride. • Focus. Watch the world go by. Arrive. WHAT'S INSIDE • A live train window with real moving scenery • An ambient sound mixer — train clatter, rain on the glass, forest, and lo-fi • App blocking that holds while you focus, powered by Screen Time • 24 European capitals to travel to, each with its own collectible stamp • A departures board, boarding pass, and passport that make focus feel like travel • Simple stats so you can watch your focused hours add up Whether you're studying for an exam, writing, coding, or just trying to stay off your phone for an hour, Cuboo gives your focus a destination. All aboard. ——— Cuboo Pro Cuboo offers an optional subscription that unlocks unlimited journeys and every feature: • Monthly — $3.99 / month • Annual — $18.99 / year (includes a 3-day free trial) • Lifetime — $34.99, one-time Payment is charged to your Apple ID at confirmation of purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period; manage or cancel anytime in your Apple ID settings. The lifetime option is a one-time purchase with no renewal. Terms of Use: https://cuboo.app/terms Privacy Policy: https://cuboo.app/privacy
Screenshots
Verdict
Fishtank and Cuboo are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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. Fishtank sells 4 one-off in-app purchases and Cuboo sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.
Fishtank ships an update every 4 days, Cuboo every 5 days. The most recent releases landed on June 11, 2026 and September 11, 2026 respectively.
| Parameter | Fishtank | Cuboo |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 4 days — better | Every 5 days |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.2 | 18.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 89 MB |
| Age rating | 4+ | 4+ |
| Developer | Jiajun Zhang | STEFAN-ANDREI HATEGAN |
In-app purchases
Fishtank
- Platinum Lootbox$0.99
- Unlock Backgrounds$1.99
- Speed Boost$1.99
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- 10x Platinum Lootboxes$6.99
Cuboo
- Cuboo Pro Monthly$3.991 Month
- Cuboo Pro Annual3 Days trial$18.991 Year
- Cuboo Pro Lifetime$34.99









