Comparison

Bubble Level for iPhone vs SurvivalKnife

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

Head to head
About

Bubble Level for iPhone

This app offers a suite of measurement and detection tools, including a bubble level for alignment, angle measurement, surface flatness checks, and metal detection. It also features an AR ruler for distance measurement and an inclinometer for off-road navigation.

Highlights
  • Bubble level for object alignment
  • Angle measurement
  • Surface flatness check
  • Metal and wire detection
  • AR ruler for distance measurement
  • Inclinometer for tilt control
  • Compass
Read full description

NEW and UNIQUE features and functionalities: 1. Classic water-level + Object alignment 2. Angle measurement 3. Surface flatness 4. Metal detection - detect wire inside the wall before drilling it 5. Inclinometer - Also known as a tilt – meter; will help drivers during off-road journeys, to control and minimize the risk of roll-over. 6. AR Ruler - point your camera and measure distance between objects. 7. 3D Room Plan on Pro versions 8. 2D Room Plan 9. Compass With all the new features of this app, you'll always have carpenter and off-road navigator with you! From now, with the help of Bubble Level, you’ll never have the issues regarding: • Alignment of the picture, board, furniture, wall and etc.! • Calculation of different angles in various situations! • Checking your table, shelf and surface level of every face-up objects! • Detecting metal and even wire inside the wall • Tracking the inclination of bike, car and etc. These are the main occasions of app usage, but you’ll find MUCH MORE in practice! You can get Pro features through auto-renewing subscription and if you want to continue getting premium features, your subscription should be continued. 1 Monthly subscription costs $1.99 (or equivalent), free trial - 3 days and renews automatically every month , unless you cancel it through your iTunes account 3 Monthly subscription costs $7.99 (or equivalent), free trial - 3 days and renews automatically every month , unless you cancel it through your iTunes account 1 Year subscription costs $24.99 (or equivalent), free trial - 3 days and renews automatically every yearly , unless you cancel it through your iTunes account Monthly subscription no free trial costs $5.99 (or equivalent), renews automatically every month , unless you cancel it through your iTunes account Prices are in U.S. dollars, may vary in countries other than the U.S. and are subject to change with notice. Payment will be charged to your iTunes Account at confirmation of purchase. Your subscription automatically renews unless auto-renewal is turned off at least 24 hours before the end of the current subscription. Your account will be charged for a renewed subscription within 24 hours prior to the end of current subscription. You can manage your subscription and switch off the auto-renewal by accessing your account settings after purchase. You cannot cancel the current subscription during the active subscription period. Any unused part or time-span of a free trial period will be forfeited, as soon as you purchase a subscription. Subscription Terms: Payment will be charged to your Apple ID account at the confirmation of purchase. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and cancel your subscriptions by going to your account settings on the App Store after purchase. Terms of Use (EULA): https://lmddata.blob.core.windows.net/lmdmore/bubleLevelMore/TermOfuse.html Privacy policy: http://lemondo.com/privacy We want to hear your suggestions, likes, complaints.. Please leave your feedback, rate us on the AppStore or use the contact link to stay in touch. Get Bubble Level NOW with simple, high resolution graphics and ENJOY!

About

SurvivalKnife

This app helps you create personalized emergency preparedness plans for your household, considering individual needs and local hazards. It offers offline maps, routing, and inventory management, ensuring you're ready even without cell service.

Highlights
  • Personalized household emergency plans
  • Offline maps and turn-by-turn routing
  • Inventory tracking and readiness scoring
  • Household records and printable cards
  • Private encrypted vault for documents
  • Real-time local hazard notifications
  • Daily survival lessons and field guide
Read full description

Most emergency advice is written for a generic family that doesn't exist. SurvivalKnife builds a plan around the people actually in your home - their medications and mobility needs, your pets, your dwelling, your vehicles - and it keeps working when the cell network doesn't. A PLAN FOR YOUR ACTUAL HOUSEHOLD Answer a few questions and SurvivalKnife writes a plan specific to you: who lives there, what they need, and the hazards where you live. Every plan comes with an action checklist you can tick off, attach photos to, and print. Seven ready-made plans - flood, wildfire, hurricane, earthquake, tornado, power outage and more - work instantly and offline. Personalize any of them to make it yours. When something isn't on file, the plan asks you instead of guessing. OFFLINE MAPS AND OFFLINE ROUTING Download the states you care about and get a real map with turn-by-turn routing and no cell service at all. The routing engine runs on your phone, not in the cloud. Layers for shelters, hospitals, fire and police, and water stay available offline, plus cellular coverage maps so you know where you'd get a signal. KNOW WHAT YOU HAVE - AND WHAT'S MISSING Scan a shelf with your camera or add items by voice. SurvivalKnife scores your readiness against real scenarios and shows the next most important gap to close. The needs calculator does the math for your household: calories, water, sanitation and days of supply, adjusted for climate and activity. ONE PLAN, EVERY PHONE IN THE HOUSE Family Edition covers up to 5 people. Plans, saved materials, routes, inventory and your household profile stay in sync on everyone's phone. Younger members get Youth View - a simplified version that shows only what a guardian has approved for them. HOUSEHOLD RECORDS, READY WHEN YOU NEED THEM Printable medical and contact wallet cards. Blood types, medications, allergies, mobility needs, key contacts, addresses with dwelling details and vehicles - all in one place, all feeding your plans. A PRIVATE VAULT THAT STAYS ON YOUR PHONE Passports, insurance, IDs. Vault items stay on your device, never sync to your household, and are excluded from AI and search. Set a vault PIN to encrypt them. KNOW WHAT'S HAPPENING NEAR YOU Wildfire detections, weather warnings, air quality and earthquakes on the map, with notifications for the ones near your home. LEARN BEFORE YOU NEED IT A two-minute daily survival lesson with streaks and skill paths, plus an offline field guide covering water, first aid, shelter and navigation - readable with no connection. PRIVACY Your Personal Vault never syncs - not to us, not to your household - and setting a vault PIN encrypts it on your device. Household details shared with AI to build a plan are minimized: first names only, never phone numbers, emails or addresses. Maps and routing run on your phone. No ads. No data sold. SUBSCRIPTION Start with a 14-day free trial of everything. Then Field Edition is $19.99/year for one person, or Family Edition is $39.99/year for a household of up to 5 - about 67 cents per person per month. Everything you set up during the trial is saved. Subscriptions are billed annually to your Apple Account and renew automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel anytime in your Apple Account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://survivalknife.ai/privacy IMPORTANT SurvivalKnife is a preparedness and educational reference tool. It is not a substitute for professional training, qualified medical care, or emergency response services. It does not contact emergency services, monitor your location, or alert anyone on your behalf. In any actual emergency, call 911 or your local emergency number.

Screenshots

Bubble Level for iPhone4 screens
SurvivalKnife4 screens

Verdict

The call

The clearest difference is ads: SurvivalKnife at none against Bubble Level for iPhone's shown. SurvivalKnife also leads on rating (5.0 vs 4.6) and update cadence (every 10 days vs every 5 weeks). Bubble Level for iPhone's advantage is ratings volume (112K vs 1). On price, in-app purchases, monetization model 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. Bubble Level for iPhone sells 8 in-app purchases, starting at $4.99 per 7 days and SurvivalKnife sells 2 in-app purchases, starting at $19.99 per year. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

SurvivalKnife holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Bubble Level for iPhone has 112K ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Bubble Level for iPhone ships an update every 5 weeks, SurvivalKnife every 10 days. The most recent releases landed on November 1, 2026 and October 29, 2026 respectively.

Scorecard4 real differences · 6 level
Bubble Level for iPhone versus SurvivalKnife: the parameters behind the verdict, then further details
ParameterBubble Level for iPhoneSurvivalKnife
PriceFreeFree
Rating4.6 (112K ratings)5.0 (1 ratings) — better
Positive reviews34.5% of reviews—
Number of ratings112K — better1
Update frequencyEvery 5 weeksEvery 10 days — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad — betteriPhone
Requires iOS17.617.0 — better
Further details — not scored
Size181 MB170 MB
Age rating4+12+
DeveloperLemondo Apps LLcAtherton Labs LLC

Customer experience

Bubble Level for iPhone

All ratings111,706 ratings
Positive91.8%
Neutral3.5%
Negative4.7%
Written reviews406 reviews
Positive34.5%
Neutral4.7%
Negative60.8%

SurvivalKnife

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

Bugs and requests

Bubble Level for iPhone

Reported bugs

3 issues
  • App freezing/crashing
  • Ads blocking access to app features
  • Inconsistent performance across devices

Requested features

4 requests
  • Calibration option
  • Improved contrast for outdoor visibility
  • Larger font size for readouts
  • Plumb line view through camera

SurvivalKnife

Not enough reviews yet to summarise bugs or requests.

In-app purchases

8 purchases

Bubble Level for iPhone

Subscriptions7
  • Weekly subscription$4.997 Days
  • Weekly free trial3 Days trial$4.997 Days
  • Monthly subscriptions$5.991 Month
Show 4 more
  • Bubble Level Pro3 Days trial$5.991 Month
  • 3 month3 Days trial$7.993 Months
  • 1 Year$19.991 Year
  • 1 Year no free trial$19.991 Year
One-time1
  • Remove Ads$0.99
2 purchases

SurvivalKnife

Subscriptions2
  • Field Edition14 Days trial$19.991 Year
  • Family Edition14 Days trial$39.991 Year

Questions

Is Bubble Level for iPhone free?
Bubble Level for iPhone is free to download, with in-app purchases available.
Is SurvivalKnife free?
SurvivalKnife is free to download, with in-app purchases available.
Which has better reviews, Bubble Level for iPhone or SurvivalKnife?
SurvivalKnife is rated higher. Bubble Level for iPhone averages 4.6 out of 5 from 112K ratings, while SurvivalKnife averages 5.0 from 1 ratings.
Do Bubble Level for iPhone or SurvivalKnife have ads?
Bubble Level for iPhone shows ads; SurvivalKnife does not.
Which is updated more often, Bubble Level for iPhone or SurvivalKnife?
Bubble Level for iPhone ships an update every 5 weeks, and SurvivalKnife every 10 days. Most recently, Bubble Level for iPhone was updated on November 1, 2026 and SurvivalKnife on October 29, 2026.

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