Games like [DEMO] Idle Trillionaire
[DEMO] Idle Trillionaire. These games share the most with it, and each one says why.

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
Fish Kingdoms:Idle ArenaDormant
Also idle, cards, collection
Summon and raise anime-style fish warriors for turn-based idle card battles built around team combinations.
75% idle
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.

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.

Cast n Chill
Also collection, idle
A relaxed pixel fishing game with a dog companion where you sell catches for better gear across 16 spots, and can switch to a passive mode that fishes for you.
95% steam50% idle
Fish to Dish: Idle Sushi
Also 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
Fruit Stand Fortune
Also idle, collection
Spin slot machines and pachinko boards for fruit to sell at Kate the Cat's stand, unlocking odd customers and auto-click upgrades.
96% steam
Bugtopia
Also idle, 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
Idle Waters
Also collection, 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
Idle TCGDormant
Also idle, cards
An old-school browser incremental with a trading card theme, built to be finished over one to three days.
3.8★ galaxyhas ending
Galaxy TrillionaireDormant
Also cards, idle
A family-friendly edition of Idle Trillionaire with every card unlocked and mature card themes swapped for gentler ones.
3.5★ galaxy
Cozy Idle Fisher
Also collection, idle
Fish across lakes, upgrade rods and bait, hire helpers and hunt for rare legendary catches.
3.5★ galaxy
Cosmic CollectionDormant
Also cards, collection
Poke a black hole to pull collectible cards, chasing rare finds and unlocking fun facts along the way.
3.4★ galaxy
Idle Pocket PlanetUpdated
Also idle, collection
Combine settlements and ships on small planets to build new constructs, colonizing strange galaxies and filling a journal with artifacts.

Abstractors
Also cards, collection
Open card packs online, then chat, trade and battle with other players on leaderboards. An account is required.
3.2★ galaxy
Idle Dice 2Updated
Also cards, idle
Roll up to 25 independently upgraded dice and draw from a custom deck of unusual cards to score points and clear challenges.
81% steam
MementoMori
Also idle, collection
A gacha-style idle RPG about girls branded witches, known for its vocal soundtrack and characters who grow stronger over time.
75% steam
Fantasy Idle Dungeon
Also collection, idle
Hatch, fuse and evolve creatures called Jenin, arrange them in formations and gear them with enchanted equipment while they push the dungeon even when you are away.
69% steam75% idle
AdVenture Ages: Idle ClickerUpdated
Also idle, collection
Travel through history restoring the timeline, tapping through missions, collecting heroes, and gathering resources in ages from Bronze to Atomic.

AFK ArenaUpdated
Also collection, idle
A hero-collecting idle RPG with a campaign, a beast system and co-op modes.

AFK God of DestructionUpdated
Also idle, collection
Command shadow forces in a dark fantasy isekai, collecting artifacts and conquering dungeons while your shadows grow in your absence.
75% idle
AFK Heroes: Fantasy Idle RPGDormant
Also idle, collection
Summon heroes, set lineups and let them fight while you are away, needing only minutes a day.
75% idle
Airport BillionAir Idle TycoonUpdated
Also idle, collection
Rebuild a derelict airstrip into a hub, assembling a fleet and routes while automated staff earn while you are away.
75% idle