Games like Intelligent Design: An Evolutionary Sandbox
Intelligent Design: An Evolutionary Sandbox mostly idle. These games share the most with it, and each one says why.

Check Back
Also slow, very idle · Same active/idle balance (mostly idle)
Built around the title: come back later and there is more. A deliberately slow, very idle game.
4.3★ galaxy90% idle
20,000 Miles Under the Sea
Also very idle, slow · Same active/idle balance (mostly idle)
A diver sinks toward the bottom of the Mariana Trench while you watch or minimize the game, deciding when to quit before meeting what lurks below.
39% steam90% idle
Rock Simulator 2
Also slow, very idle
Be a rock and watch the world change around you, unlocking over 100 rocks at a deliberately slow pace, alone or with friends.
93% steam70% idle
LurkBait Twitch Fishing
Also very idle · Same active/idle balance (mostly idle)
A Twitch overlay where viewers cast lines through chat, points or subs, and the fishing plays out on its own while you stream.
98% steam90% idle
Black Hole FishingUpdated
Also science, biology
Use a black hole to vacuum fish from a pond, then breed, inject traits into and research them while feeding the singularity to grow it.
89% steam
Viridi
Also slow · Same active/idle balance (mostly idle)
Care for a small pot of succulents that grow in real time. Water them, name them, and keep the window open beside your work.
92% steam90% idle
Rusty's Retirement
Also very idle · Same active/idle balance (mostly idle)
A tiny robot farm that lives at the edge of your screen while you do other things. Idle in the purest sense.
97% steam15–30h ending95% idle
The Dream Globe
Also very idle · Same active/idle balance (mostly idle)
A tiny world inside a snow globe runs on its own while you check in to buy upgrades. Discover over 100 gems, crops and foods across dream regions.
94% steam90% idle
Fishing The Abyss
Also very idle · Same active/idle balance (mostly idle)
A small robot fishes by itself in a tall window beside your work, leveling up to reach deeper water and stranger catches. Clicking helps but is optional.
95% steam90% idle
My Little Life
Also very idle · Same active/idle balance (mostly idle)
A small person lives out their life in a strip along the bottom of your screen, working, decorating and chasing dreams while you do other things.
91% steam90% idle
Tree Bonsai
Also slow, biology
Shape a plum bonsai by pruning, feeding, and grafting as it grows on its own through the seasons, blossoming, fruiting, and eventually aging and dying.
81% steam
Hero Tale
Also very idle · Same active/idle balance (mostly idle)
A background auto-battler: a hero fights across a fantasy island while you check in to spend points in a 300-node skill tree and swap loot.
71% steam90% idle
修炼成仙
Also very idle · Same active/idle balance (mostly idle)
A minimal text cultivation game: create a character and it fights, loots, and trains on its own from its first steps toward ascension and rebirth.
71% steam90% idle
Karyofox
Also biology, science
A fox-themed incremental built on genetics, with level 100 as its endgame.
4.0★ galaxyhas ending
Idle HumanUpdated
Also biology, science
Build a human body starting from one cell, adding bones, organs, nerves and muscles along the way.

Cell to Singularity: EvolutionUpdated
Also science, biology
Click through the history of life from primordial soup to technology, climbing a science tech tree.

Idle evolution: Life on EarthUpdated
Also biology, science
Guide life from the ancient seas to human culture while learning about prehistoric creatures along the way.

Neon Electrogenesis
Also science, biology
Excite electrons into atoms and build up six elements until you have enough atoms for one cell. A jam game with no text at all.
2.5★ galaxyhas ending
Cell to Singularity
Also science
Evolve life from a single cell to a technological singularity, with a surprising amount of real science in the tooltips.
89% steam70% idle
THE LONGING
Also slow
Wait 400 real days in an underground palace for a king to wake. The clock runs while the game is closed, so you can explore or simply leave.
92% steamhas ending70% idle
挂机神话
Also very idle
A meme-heavy Chinese cultivation idler about farming procedurally generated gear and characters through an endless tower. Chinese-language store text.
90% steam70% idleOmega Meta ZeroDormant
Also very idle · Same active/idle balance (mostly idle)
A zero-player incremental meant to run like a screensaver, watching a number climb to absurd heights in Omega Layers notation.
85% idle
Settlemoon
Also slow
Build a side-scrolling fantasy town in real time, posting quests for visiting adventurers and decorating as it grows. It keeps working while the game is closed.
87% steam70% idle
Placid Plastic Duck Simulator
Also slow
Float in a pool as a rubber duck while more ducks drop in one by one, with a day and night cycle and calm music.
98% steam