# Bubble Level for iPhone vs SurvivalKnife

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.

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.

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.

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.

## The numbers

| Metric | Bubble Level for iPhone | SurvivalKnife |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (112K ratings)](https://appshunter.io/ios/app/bubble-level-for-iphone/id465613917/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/survivalknife/id6777308743/reviews)** |
| Number of ratings | **112K** | 1 |
| Positive reviews | 34.5% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 5 weeks | **Every 10 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 181 MB | 170 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Lemondo Apps LLc](https://appshunter.io/developer/1131593451) | [Atherton Labs LLC](https://appshunter.io/developer/6777308745) |

## What reviewers say

### Bubble Level for iPhone

[App page](https://appshunter.io/ios/app/bubble-level-for-iphone/id465613917)

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly subscription | $4.99 | per 7 days |
| Weekly free trial | $4.99 | per 7 days |
| Monthly subscriptions | $5.99 | per month |
| Bubble Level Pro | $5.99 | per month |
| 3 month | $7.99 | per 3 months |
| 1 Year | $19.99 | per year |
| 1 Year no free trial | $19.99 | per year |
| Remove Ads | $0.99 | one-time |

**What reviewers like**

- 🚀 Handy tool
- 👍 Useful features
- 🚀 Accurate readings
- 👍 Reliable for leveling RVs and caravans

**What reviewers complain about**

- 🐛 Inaccurate readings
- 💩 Constant ads disrupting usage
- 🤑 Paywall for full functionality
- 🐛 Ads still present after paid upgrade

**Reported bugs**

- App freezing/crashing
- Ads blocking access to app features
- Inconsistent performance across devices

**Requested features**

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


### SurvivalKnife

[App page](https://appshunter.io/ios/app/survivalknife/id6777308743)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Field Edition | $19.99 | per year |
| Family Edition | $39.99 | per year |


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*