A hard sci-fi idle game evolving from the Big Bang to an interstellar civilization
Interactive storytelling platform where you play, create and share stories in beloved worlds
Stage
Not given
Established
Founded
Not given
2020
Based in
Not given
US
Pricing model
Freemium
Freemium
Pricing
Free with no ads; optional Supporter: $2.99/mo, $19.99/yr, or $29.99 lifetime; time crystal packs: $1.99 (Skip a night), $4.99 (Skip a wall), $9.99 (Skip a week)
Free tier includes unlimited play across all worlds, character chat, and personal profile. Creator plan available for creating and sharing custom worlds (price not specified on pricing page).
Key features
13.8 billion year cosmic timeline from Big Bang to interstellar civilization
118 sourced research cards with scientific citations
12 game eras spanning Cosmos, Life and Civilization
16 different endings
12 civilization channels inspired by science fiction and real concepts
Playable on phone, desktop and iPad with cloud save sync
Installable on phone home screen for offline play
No ads and completely free to play
1,400+ nodes each grounded in real science with sources
Physics-accurate simulation where 1 light-year equals 1 real hour
Interactive fiction gameplay with branching narratives
Character chat and side conversations
Atlas world-building studio
Licensed worlds from film and publishing partners
Modifier cards for story customization
Private and public world sharing options
Creator API for building custom experiences
Hand-drawn art and human-written narrative beats
What makes it different
Every scientific claim cites real sources with year, researcher and publication
Hard sci-fi design where physics and signal times follow real scientific laws
Completely free with no ads, payment optional and never pay-to-win
Invented game lore clearly separated and labeled apart from real science basis
Curated collection of 24+ open-source astronomy, physics and biology projects
Protects creator IP and never trains models on partner content
Narrative world model ensures canon compliance across all player stories
Human-created narrative beats and art paired with specialized AI
Transmedia experience combining fanfiction, RPGs and social gameplay
Small tuned models that outperform larger general models on narrative tasks
Cosmos Era
Hidden Door