AiRuler vs PrepperApp
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
AiRuler
Visualize and measure objects in augmented reality using your device's camera. Accurately determine length, area, and angles of real-world items, and even draw directly onto your surroundings.
- Augmented reality visualization
- Measure length, area, and angles
- Draw on real-world objects
- Accurate size determination
- Object measurement via camera
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AiRuler visualize the measurement in Augmented Reality and let you get the size of what you see. Put an object on a flat surface, aim to anywhere the object actually exists using camera and get the size of length, area, angle or height, even draw your objects on the real world.
PrepperApp
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PrepperApp helps you stay calmly prepared for a power cut, a storm, a flood or another emergency. One number shows how many days your household can manage, you make an emergency plan together, and SOS and first aid are always close at hand. TODAY One honest number: this is how many days your water and food will last. The app counts 3 litres of water and 2,000 kcal per person per day and compares that with your government's advice. You see your weakest point and your next step straight away. SUPPLIES Add products by scanning the barcode, photographing a receipt or taking a photo of your shelf. For each category you see what you have, what expires soon and what is past its date. The shopping list helps you fill the gaps. ONE EMERGENCY PLAN FOR THE WHOLE FAMILY Write down what you will do in a power cut, a fire, a flood and other situations. Agree on meeting points, make an evacuation plan and work through the emergency checklists. Share your supplies, emergency plan and family card with your household. With "Are you safe?" you let them know you're fine in one tap. SOS AND FIRST AID One tap on the red SOS bar opens the emergency menu: call the emergency number, share your location, open guided first aid or text your emergency contacts. The app never calls by itself. The CPR timer gives the rhythm with a tick and tells you out loud when to give breaths. The first aid guide, tick bite help and emergency protocols are all in one place. SOS and first aid also work when you're not signed in. OUTDOORS Record your walks and look back at them on the map: your route in gold, the elevation profile, your pace per kilometre and your photos. Keep a trip day by day, with your stops, photos and walks on one map. LEARN AND THE COACH A learning path of twelve lessons, guides and practice questions help you step by step. The Coach answers questions about your own preparation and always names its source. ON YOUR IPHONE AND APPLE WATCH While you record a walk, distance and time show on your Lock Screen, with Pause and Photo. Widgets for your Home Screen and Lock Screen, search in Spotlight, Siri shortcuts in four languages and Control Center buttons for SOS and Start walk. On your Apple Watch you have your days, a compass, SOS and your emergency contacts on your wrist. YOUR DATA You create a free account with your email address, so your supplies and household move safely to a new phone. Your medical profile, medication and document vault stay on your phone. Family chat is end-to-end encrypted. No ads, and our servers are in the EU. FREE, WITH PRO AS AN EXTRA The core of the app is free. Pro adds unlimited supplies, all emergency plan scenarios, the document vault and the Coach's AI help, among other things. You buy Pro once, with no subscription. In English, Dutch, German and Spanish, with government advice for the Netherlands, Belgium, Germany, Spain, the United Kingdom, the United States and Australia. PrepperApp does not replace the emergency services. In acute danger, always call the emergency number.
Screenshots
Verdict
The clearest difference is in-app purchases: AiRuler at none against PrepperApp's 1. AiRuler also leads on iOS requirement (11.0 vs 17.6). PrepperApp's advantage is update cadence (every 3 days vs fortnightly). 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
Both are free to download. PrepperApp sells 1 one-off in-app purchase. AiRuler asks for nothing beyond the download.
AiRuler ships an update fortnightly, PrepperApp every 3 days. The most recent releases landed on October 2, 2026 and October 19, 2026 respectively.
| Parameter | AiRuler | PrepperApp |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (5 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Fortnightly | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 11.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 18 MB | 61 MB |
| Age rating | 4+ | 12+ |
| Developer | BHI Technologies, Inc. | Michael Stuut |
In-app purchases
AiRuler
No in-app purchases
PrepperApp
- PrepperApp Pro$3.99









