Custos: Survival Prepper

Survival prepper guide for blackout, hurricane, earthquake & disaster. Works fully offline — no internet, power, or signal needed. 2,100+ entries, CPR, checklists.

What do you do when power, internet, and cell service all fail at once?

Custos is your offline companion built for exactly that moment. An app that needs no internet — because it has to work when nothing else does. Unlike any other emergency app: 100% offline, no cloud, no servers, no dependencies.

WHY CUSTOS? In a blackout, flood, or earthquake, you don't just lose comfort — you lose access to every piece of information you rely on. Where's the nearest hospital? How do I treat a burn? How do I purify water? How do I survive 72 hours without power? Custos has the answers. Already installed, already there.

WHAT YOU GET:

▸ CRISIS SCENARIOS THAT GUIDE YOU THROUGH THE WORST 16 real-world emergencies (blackout, flooding, earthquake, storm, wildfire, pandemic, chemical spill, heat wave, evacuation, and more). Each scenario in 4 phases: what to do IMMEDIATELY, what to do in 24 hours, what to do long-term — and how to be better prepared next time.

▸ FIRST AID THAT SAVES LIVES 46 emergency topics with clear step-by-step instructions: CPR, heart attack, shock, burns, poisoning, fractures, stroke, crush syndrome, pediatric emergencies. Triage decision tree for mass casualty events. Help right when every second matters.

▸ SURVIVAL KNOWLEDGE THAT MAKES YOU INDEPENDENT 45 topics from crisis research and survival training: water purification, fire making, knots, Morse code, weather reading, navigation without GPS, backup power (solar, generator, EV), CBRN protection. Knowledge you can't find compiled anywhere else.

▸ CHECKLISTS THAT MAKE YOUR HOME RESILIENT 28 ready-made lists for emergency bag, pantry, first aid kit, document folder. Scales to your household size. You know exactly what you need — and what's still missing.

▸ OFFLINE MAPS WITH GPS Download maps for your region — works without internet. GPS works without cell service. Always find the nearest safe location: hospital, police, pharmacy, shelter.

▸ MEDICATION DATABASE Scan barcodes of your medications offline — 1.28 million entries in the German PZN database. Custos instantly shows active ingredient, dosage, expiration. Manages your home pharmacy with expiry alerts.

WHO IS IT FOR? Parents protecting their family. Seniors living alone. Hikers and campers. People in regions with natural hazards. Anyone who doesn't want to find out they're unprepared during the actual emergency.

PRIVACY FIRST No cloud. No tracking. No ads. Your data stays on your device. No account required.

OPTIONAL PREMIUM Monthly €2.49 · Yearly €14.99 · Lifetime €24.99 one-time. Free: 3 scenarios, first aid, emergency call, basic checklists. Premium: All 16 scenarios, offline maps, inventory tracking, family profiles, PDF export.

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