Games like Fish Kingdoms:Idle Arena
Fish Kingdoms:Idle Arena leans idle. These games share the most with it, and each one says why.

Tap Tap Fish - AbyssRiumUpdated
Also idle, ocean, animals · Same active/idle balance (leans idle)
Fill an aquarium with fish and whales that gradually grow the tank with little effort from you.
75% idle
Bounty Bash: Idle Pirate RPGUpdated
Also idle, ocean, collection · Same active/idle balance (leans idle)
Summon a pirate crew that auto-battles at sea around the clock, growing stronger while you are away.
75% idle
Joyquarium
Also ocean, animals, collection · Same active/idle balance (leans idle)
Raise fry until they are big enough to sell, keep adults in the tank for steady income, and open packs to unlock 144 species. An auto mode lets the tank run on its own.
97% steam70% idle
Fish to Dish: Idle Sushi
Also ocean, collection, idle
A fishing boat sits along the edge of your desktop reeling in sea life to serve as sushi, while you upgrade rods and bait and fill an aquarium.
96% steam90% idle
Idle Waters
Also collection, ocean, idle
Fish from a window at the bottom of your screen, manually or with auto-fishing, to fill a collection of 100 species across 12 biomes and stock your aquarium.
94% steam90% idle
Desktop FishingDormant
Also collection, animals, ocean
A frog in the corner of your screen fishes while you work, catching 50+ species with shiny variants and unlocking new spots and outfits.
91% steam90% idle
PC FISH: Taskbar Aquarium
Also ocean, collection, animals
Raise and breed fish in a desktop aquarium, discover rare traits among 450+ fish and decorations, and trade on the Steam Market.
78% steam90% idle
Hooked Inc: Fishing GamesUpdated
Also ocean, collection, idle
Swipe to catch fish, hire a crew that keeps fishing when you're away, and upgrade boats to reach new waters.
50% idle
Bugtopia
Also idle, animals, collection
Raise and breed over 300 real-world insect species in terrariums you landscape yourself, with breeding boxes that can produce rare new bugs.
92% steam
MyVoiceZoo
Also animals, collection · Same active/idle balance (leans idle)
Record your own voice as animal calls, and each cry in your zoo earns income to adopt more animals, with little need for active play.
92% steam75% idle
Fantasy Aquarium
Also ocean, animals, collection
Breed fish across themed tanks and choose between keeping them for steady gold or trading them in, with ambient music for working.
85% steam
Holoidle
Also cards, collection, idle
Grow a Hololive streamer's influence with upgrades and a deck of collectible collab cards, placing up to six for synergy bonuses.
84% steam
Forest IslandUpdated
Also idle, animals, collection
Collect over 100 animals and birds and grow calm natural habitats for them at your own pace.

Idle Baseball Manager TycoonUpdated
Also idle, collection, cards
Build a stadium, collect baseball player cards, set your lineup, and let the team play to bring in wins and money.

One-Punch Man:Road to Hero 2.0Updated
Also idle, collection, cards
Collect One-Punch Man heroes and monsters, arrange them in formations, and send the team through story arcs and a tower of trials.

Idle Fish 2: Fishing TycoonDormant
Also idle, ocean, animals
Catch fish and upgrade your boat and fisherman to haul in rarer species.

Idle Animal EvolutionDormant
Also idle, animals, collection
Breed hybrid creatures in a lab by crossing pairs of animals.

Idle Aquarium: Fish Tank ZooDormant
Also idle, ocean, collection
Grow an aquarium by collecting new fish species on voyages and upgrading tanks to draw more visitors.

The Seven Deadly Sins: IDLEUpdated
Also idle, collection, cards
Tap to draw cards and clear stages with chibi Seven Deadly Sins heroes, plus PvE raids and PvP duels.

Chillquarium
Also ocean, collection · Same active/idle balance (leans idle)
Buy fish, raise them in real time, and sell them or keep them for ticket income while chasing 156 species and rare color variants.
93% steam70% idle
Idle MafiaUpdated
Also collection, idle · Same active/idle balance (leans idle)
Run criminal businesses, collect capos with special abilities and take over territory while your crew does the work.
75% idle
Invincible: Guarding the GlobeUpdated
Also collection, idle · Same active/idle balance (leans idle)
Recruit characters from Invincible, merge clones to rank them up, and run idle battles in the background.
75% idle
Crush Them All - Idle RPGUpdated
Also idle, collection · Same active/idle balance (leans idle)
Collect heroes and crush bosses across more than 1000 stages, ascending to new worlds and progressing while away.
75% idle
Idle Car !Dormant
Also idle, collection · Same active/idle balance (leans idle)
Assemble cars part by part to learn how they work, then move on to bikes, yachts, submarines, and spaceships, with builds progressing while you sleep.
75% idle