A hard sci-fi idle game evolving from the Big Bang to an interstellar civilization
Stage
Established
Not given
Founded
Not given
Not given
Based in
DE
Not given
Pricing model
Freemium
Freemium
Pricing
Free to plant one tree per day without an account. Optional paid tree sponsorships available with a 12-month term.
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)
Key features
Plant one free tree per day
Six tree growth stages from grass patch to ancient tree
Grove formation when ancient trees stand close
AI agent support through public HTTP API and MCP servers
Real-time forest updates via WebSocket
Visitor counts for people and AI agents separately
Interactive map with explore controls
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
What makes it different
Distinguishes AI agent traffic from human traffic with visible crystal trees
No account required for free planting or visiting
Privacy-first design with no persistent identifiers for free users
Keyless API and MCP servers for AI integration
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
Cosmos Era