Comparison

Fast Customer vs Underground Prepper

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Fast Customer

This app eliminates the need to wait on hold when contacting customer service. Simply tap a button, and the app will call you back when a representative is available.

Highlights
  • Eliminates waiting on hold
  • Callback feature
  • Contact customer service
  • User-friendly interface
Read full description

While waiting on hold in early 2011, we thought, "Why am I waiting on hold? Why can't I just tap a button and get a call when someone's ready to talk to me? A world without hold. Can you imagine? So after several late nights building FastCustomer, we landed in Bayou Bakery in Arlington, VA to make a test call to AT&T. WOULD IT WORK?! HECK YES IT WOULD! With a tap followed by a few minutes sipping coffee, FastCustomer was taking its first steps to eliminate "waiting on hold" from all our lives. When our phone rang moments later and an AT&T rep was ready to help, we knew that contacting customer service would never be the same again. WHICH WAS AWESOME. Hundreds of thousands of delighted users later, we're still passionate about making customer service better for everyone.

About

Underground Prepper

This app helps you meticulously track your family's emergency supplies and preparedness levels. It organizes inventory, manages household member needs, and provides readiness tiers for various disaster scenarios. All data is stored locally for offline access and privacy.

Highlights
  • Family emergency preparedness tracking
  • Detailed inventory management
  • Household member profiles
  • Bugout bag planning
  • Offline functionality
  • Exportable reports
  • Preparedness checklists
Features
Read full description

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. --- 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. --- 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. --- 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. --- 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. --- 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. --- 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. --- 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. --- 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. --- 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. Underground Prepper is an organizational and inventory tool only. It does not provide medical, survival, or safety instructions, and should not be relied upon as your sole source of emergency guidance. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ --- Underground Prepper. Know where you stand.

Screenshots

Fast Customer4 screens
Underground Prepper4 screens

Verdict

The call

The clearest difference is rating: Underground Prepper at 5.0 against Fast Customer's 2.3. Fast Customer's advantage is in-app purchases (none vs 3) and ratings volume (3 vs 1). On price, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Underground Prepper sells 3 in-app purchases, starting at $9.99 per month. Fast Customer asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Underground Prepper holds the better App Store score, 5.0 against 2.3. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

Scorecard5 real differences · 5 level
Fast Customer versus Underground Prepper: the parameters behind the verdict, then further details
ParameterFast CustomerUnderground Prepper
PriceFreeFree
Rating2.3 (3 ratings)5.0 (1 ratings) — better
Positive reviews0.0% of reviews—
Number of ratings3 — better1
Update frequency—Every 2 days
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS8.0 — better15.0
Further details — not scored
Size7 MB93 MB
Age rating4+4+
DeveloperFastCustomer, Inc.5th Studios, LLC

Customer experience

Fast Customer

All ratings3 ratings
Positive33.3%
Neutral0.0%
Negative66.7%
Written reviews3 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Underground Prepper

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Fast Customer

No in-app purchases

3 purchases

Underground Prepper

Subscriptions2
  • Monthly Subscription$9.991 Month
  • Yearly Subscription$109.991 Year
One-time1
  • Lifetime Membership$349.99

Questions

Is Fast Customer free?
Fast Customer is free to download, with no in-app purchases.
Is Underground Prepper free?
Underground Prepper is free to download, with in-app purchases available.
Which has better reviews, Fast Customer or Underground Prepper?
Underground Prepper is rated higher. Fast Customer averages 2.3 out of 5 from 3 ratings, while Underground Prepper averages 5.0 from 1 ratings.
Do Fast Customer or Underground Prepper have ads?
Neither Fast Customer nor Underground Prepper shows ads.

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