Comparison

PatientEngine 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

PatientEngine

Streamline patient communication and appointment scheduling with automated text messaging and a visual lead pipeline. Convert leads, re-engage past patients, and reduce no-shows with efficient, automated follow-ups.

Highlights
  • Automated text message follow-ups
  • Campaigns for past patients
  • Lead conversion tools
  • Google review generation
  • Appointment scheduling and confirmation
  • Visual lead pipeline management
  • Auto-booking calendar widget
Features
Read full description

Schedule Patients, on Demand. In todays world no one is is picking up the phone. Yet, “90% of people read a text message within the first 3 minutes” and 89% of your patients prefer them to phone calls and emails. So the next time your friend tells you they’re “just seeing this now” a day later, they’re lying. Take our word for it. We make texting easy, including enabling your current business phone number to text patients. With PatientEngine, you’ll be able to: Automatically follow up with leads via text, email, live call transfers, voicemail drops and Facebook messenger Create campaigns to bring back past patients Convert leads into patients Build Google reviews from satisfied customers Schedule and confirm appointments Save Time & Money Still making phone calls to confirm appointments or reach out to new customers? Today, phone calls are inefficient, and worse, ineffective. PatientEngine allows you and your patients to quickly exchange messages, without having to wait for a time when both parties are free. PatientEngine clients quickly see upwards of 50% time savings per staff member when using text vs the phone. Manage and Automate Your Lead Pipeline Tired of using messy spreadsheets to track all your leads? Or even worse you don’t know which lead came from which source and what part of the customer journey they’re in? Use our drag and drop, visual pipeline management tool to easily see what stage of the customer journey your leads are in, what source they came from as well as be able to automate follow up messages based on what stage they’re in! Calendar to Manage and Auto Book your Leads and Patients No longer do you have to chase leads to book their appointment. Now you can use our native calendar widget to have leads book themselves through your advertising campaigns and/or place it on your website so you can book more appointments from your website visitors. All of the confirmation and reminder messaging can now be completed automated and you can even create a voicemail reminder. This alone will drastically reduce your no show rates while simultaneously saving your staff hours per week of chasing and remind patients about their appointments!

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

PatientEngine4 screens
Underground Prepper4 screens

Verdict

The call

The clearest difference is in-app purchases: PatientEngine at none against Underground Prepper's 3. PatientEngine also leads on ratings volume (4 vs 1). Underground Prepper's advantage is update cadence (every 2 days vs every 2 months) and device support (4 vs 2). On price, rating, ads and iOS requirement 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. PatientEngine asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for PatientEngine against 5.0 for Underground Prepper. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

UpkeepUpdate frequency

PatientEngine ships an update every 2 months, Underground Prepper every 2 days. The most recent releases landed on October 3, 2026 and September 25, 2026 respectively.

Scorecard5 real differences · 5 level
PatientEngine versus Underground Prepper: the parameters behind the verdict, then further details
ParameterPatientEngineUnderground Prepper
PriceFreeFree
Rating5.0 (4 ratings)5.0 (1 ratings)
Positive reviews100.0% of reviews—
Number of ratings4 — better1
Update frequencyEvery 2 monthsEvery 2 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod, Mac — better
Requires iOS16.615.0 — better
Further details — not scored
Size341 MB93 MB
Age rating4+4+
DeveloperMedSpa Advertising LLC5th Studios, LLC

Customer experience

PatientEngine

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Underground Prepper

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

In-app purchases

None

PatientEngine

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 PatientEngine free?
PatientEngine 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, PatientEngine or Underground Prepper?
PatientEngine and Underground Prepper are both rated 5.0 out of 5 on the App Store, from 4 and 1 ratings respectively.
Do PatientEngine or Underground Prepper have ads?
Neither PatientEngine nor Underground Prepper shows ads.
Which is updated more often, PatientEngine or Underground Prepper?
PatientEngine ships an update every 2 months, and Underground Prepper every 2 days. Most recently, PatientEngine was updated on October 3, 2026 and Underground Prepper on September 25, 2026.

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