iOS · Web · Public beta · active this week
Jerv
Uncover the world by moving through it.
Jerv is a fog-of-war map of Earth: your personal map starts blacked out, and every street you walk, ride, or roll uncovers permanently. It turns going outside into exploration — the map you reveal is yours, built from where you've actually been.
Features
What it does
Fog of war
The whole planet starts hidden. Streets you travel are revealed permanently, at street resolution.
Earn it
CoreMotion-based activity checks mean the map only clears when you're actually walking, riding, or rolling.
Yours forever
Revealed area syncs across devices and never re-fogs — a lifetime map of everywhere you've been.
Self-hosted
The entire backend runs on owned hardware behind a Cloudflare tunnel — no cloud bill scaling with users.
Architecture