Underground Prepper

5th Studios, LLC

About this app

When something goes wrong — a natural disaster, a power outage, a supply chain collapse — you won't have time to figure out where your family stands. You need to already know.

Underground Prepper is a family emergency preparedness app built around one core idea: knowing exactly what you have, where it is, and whether it's enough — before you ever need it.

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YOUR DATA STAYS ON YOUR DEVICE

Underground Prepper is built privacy-first. Every item in your inventory, every household member profile, every checklist — it all lives in an encrypted database on your device. Nothing personal ever touches our servers. The app works fully offline, by design, because the moment you need it most is often the moment the internet goes down.

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TRACK YOUR PREPAREDNESS TIER

The app measures your family's readiness across four tiers — 3 days, 3 weeks, 3 months, and beyond. Your current tier updates automatically as you build your inventory. No guesswork. No spreadsheets. Just a clear picture of where you stand and what you still need.

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MANAGE YOUR FULL INVENTORY

Organize your supplies across 14 categories: Food, Water, First Aid, Security, Power, Communications, Tools & Hardware, Clothing & Gear, Sanitation & Hygiene, Medications & Supplements, Financial & Documents, Fuel, Camping & Shelter, and Seeds & Agriculture.

Every item tracks quantity, expiration dates, storage location, owner, and — for food — calories per serving. Expiration warnings surface automatically. Built-in recommended items lists help you get started fast.

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BUGOUT BAGS FOR EVERY MEMBER

Every household member gets their own bugout bag. The app tracks five milestones per bag — Food, Water, Shelter, Defense, and First Aid — and shows exactly how many calories and how much water each person still needs to reach their goal.

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HOUSEHOLD MEMBER MANAGEMENT

Add your entire household with individual calorie and water requirements calculated from age, gender, height, and weight. Members can have their own PIN-protected access. As the account administrator, you control who can view or modify data at all times.

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INVENTORY REPORTS

View and export your inventory eight ways: by owner, category, storage area, expiration date, power requirements, season, gender, and tradable items. Every report can be printed or saved as a PDF.

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BACKUP & RECOVERY

Export your inventory as a CSV or encrypted .prep backup file protected by a 12-word recovery phrase only you know. Optionally push an encrypted backup to the server for an extra layer of protection — our server stores only the encrypted data and can never read it.

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PREP HUB & BIBLE READER

Access a library of printable preparedness checklists covering bugout bags, water storage, medical supplies, power, navigation, and more.

We believe preparedness goes beyond supplies. The built-in Bible reader — available in King James and Douay-Rheims — is there for the moments when what your family needs most isn't in the pantry.

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Try the app free with Demo Mode — no account required. When you're ready, subscriptions are available monthly, yearly, or as a one-time lifetime purchase.

Available on iOS, Android, Windows, and macOS.

Underground Prepper. Know where you stand.

What’s new

What's New in 2.1.21

Now available on many more Android phones and tablets — including older and 32-bit devices that couldn't install it before.

Also new:
-Clearer account setup, with a Register button that tells you what's still needed
-Resend your setup code right from the app
-Easier recovery if you already subscribed
-Reliability fixes for activation and first-time setup