Comparison

Fishtank vs Cuboo

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Read full description

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

About

Cuboo

Features
Read full description

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

Fishtank4 screens
Cuboo4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

ScorecardNo meaningful differences
Fishtank versus Cuboo: the parameters behind the verdict, then further details
ParameterFishtankCuboo
PriceFreeFree
Rating5.0 (4 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings4 — better—
Update frequencyEvery 4 days — betterEvery 5 days
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.218.0 — better
Further details — not scored
Size5 MB89 MB
Age rating4+4+
DeveloperJiajun ZhangSTEFAN-ANDREI HATEGAN

In-app purchases

4 purchases

Fishtank

One-time4
  • Platinum Lootbox$0.99
  • Unlock Backgrounds$1.99
  • Speed Boost$1.99
Show 1 more
  • 10x Platinum Lootboxes$6.99
3 purchases

Cuboo

Subscriptions2
  • Cuboo Pro Monthly$3.991 Month
  • Cuboo Pro Annual3 Days trial$18.991 Year
One-time1
  • Cuboo Pro Lifetime$34.99

Questions

Is Fishtank free?
Fishtank is free to download, with in-app purchases available.
Is Cuboo free?
Cuboo is free to download, with in-app purchases available.
Do Fishtank or Cuboo have ads?
Neither Fishtank nor Cuboo shows ads.
Which is updated more often, Fishtank or Cuboo?
Fishtank ships an update every 4 days, and Cuboo every 5 days. Most recently, Fishtank was updated on June 11, 2026 and Cuboo on September 11, 2026.

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