# Custos: Survival Prepper — Offline Emergency First Aid > Offline Emergency First Aid (iPhone/iPad app by Emil Deak.) - Source: https://appshunter.io/ios/app/custos-survival-prepper/id6760218134 (this page in markdown: same URL + `.md`) - Developer: [Emil Deak](https://appshunter.io/developer/1883312248) - Category: Lifestyle, Reference - Price: Free with in-app purchases - Age rating: 12+ - Requires: iOS 17.0 · 165 MB - Languages: American English - Released: 2026-03-19 - Data updated: 2026-08-20 - User reviews in markdown: https://appshunter.io/ios/app/custos-survival-prepper/id6760218134/reviews.md ## What is Custos? 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. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Terms & Privacy: https://holzbucht.de/pages/apple ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Custos Premium Jährlich | $12.99 | per year | | Custos Premium Monthly | $1.99 | per month | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Custos Premium Lifetime | $22.99 | one-time | ## Version history (last 5 releases) ### 1.2.5 — 2026-08-13 This version fixes several important issues: • German civil-protection warnings (NINA) are now displayed reliably. • Search now finds content in English, Spanish, French, and Italian too. • Improved barcode scanning for medications, including modern 2D codes on pharmacy packaging. • Numerous text and spelling corrections across all languages. • Legal texts updated. Thank you for using Custos! ### 1.2.3 — 2026-08-06 Improvements based on your feedback: • Medications can now be edited and deleted directly from the person – just tap the entry. • New medication units: syringe, drops and suppositories. • Custom allergies are now saved reliably, even without tapping “+”. Adhesive plasters and iodine added to the list. • You are now asked before unsaved changes are discarded. Thank you for your feedback! ### 1.2.2 — 2026-07-02 Minor stability and performance improvements. Thanks for using Custos. ### 1.2.1 — 2026-06-12 Reliability update: • Notifications now work reliably – permission is requested during setup • Improved offline mode: saved warnings persist without internet • Emergency call assistant, reminders and all hints now fully available in 5 languages • Faster app launch • Many more bug fixes and stability improvements ### 1.2.0 — 2026-05-28 Fully localized app metadata for 11 languages. Better discoverability worldwide with market-specific keywords and descriptions. Stability improvements. ## Apps similar to Custos | App | Rating | Price | Category | | --- | --- | --- | --- | | [SAS Survival Guide - Lite](https://appshunter.io/ios/app/sas-survival-guide-lite/id363710835) | 3.6 (176) | Free | Lifestyle | | [Offline Survival Kit](https://appshunter.io/ios/app/offline-survival-kit/id6761713992) | 4.5 (2) | Free | Lifestyle | | [PrepperPro!](https://appshunter.io/ios/app/prepperpro/id6743128293) | 3.0 (6) | Free | Lifestyle | | [Gedanke zum Tag - Robert Betz](https://appshunter.io/ios/app/gedanke-zum-tag-robert-betz/id6443434326) | 4.5 (19) | Free | Lifestyle | | [Prepper AI](https://appshunter.io/ios/app/prepper-ai/id6749353554) | 4.7 (29) | Free | Lifestyle | | [Divin!](https://appshunter.io/ios/app/divin/id6504860092) | — | Free | Lifestyle | ## More apps by Emil Deak - [CNCMate: Speeds and Feeds](https://appshunter.io/ios/app/cncmate-speeds-and-feeds/id6760557576) - [BeamMate · Laser Engraver App](https://appshunter.io/ios/app/beammate-laser-engraver-app/id6760578283) - [Pantry Wizard: Fridge Recipes](https://appshunter.io/ios/app/pantry-wizard-fridge-recipes/id6773112519) - [CarbTrail: Fuel & Hydration](https://appshunter.io/ios/app/carbtrail-fuel-and-hydration/id6777919889) - [MeterWorks Vibrometer](https://appshunter.io/ios/app/meterworks-vibrometer/id6779408803) All apps by Emil Deak: https://appshunter.io/developer/1883312248 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-20.*