# Buoyancy Calc vs HighwayRadar

The clearest difference is rating: HighwayRadar at 4.6 against Buoyancy Calc's 3.1. HighwayRadar also leads on review sentiment (79% vs 40%) and update cadence (every 9 days vs every 3 months). Buoyancy Calc's advantage is in-app purchases (none vs 4). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. HighwayRadar sells 4 in-app purchases, starting at $4.99 per month. Buoyancy Calc asks for nothing beyond the download.

HighwayRadar holds the better App Store score, 4.6 against 3.1. That said, the two scores are not equally well evidenced: HighwayRadar has 151 ratings behind it against 25, so its average is the more settled of the two. Written reviews point the same way: 40% of Buoyancy Calc's written reviews are positive against 79% of HighwayRadar's.

Buoyancy Calc ships an update every 3 months, HighwayRadar every 9 days. Both last shipped on November 3, 2026.

## The numbers

| Metric | Buoyancy Calc | HighwayRadar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.1 (25 ratings)](https://appshunter.io/ios/app/buoyancy-calc/id1482332472/reviews) | **[4.6 (151 ratings)](https://appshunter.io/ios/app/highwayradar/id6463768103/reviews)** |
| Number of ratings | 25 | **151** |
| Positive reviews | 40.0% of reviews | **78.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 9 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 1 MB | 160 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Eric Hamiter](https://appshunter.io/developer/1482332471) | [Blue Ridge Software Development LLC](https://appshunter.io/developer/1704939813) |

## What reviewers say

### Buoyancy Calc

[App page](https://appshunter.io/ios/app/buoyancy-calc/id1482332472)

Calculate the optimal weight for scuba diving based on environmental factors. Input your weight, water type, tank, and exposure suit to get a suggested weight for neutral buoyancy.

**Highlights:** Calculate suggested diving weight, Adjust for water type, Adjust for tank type, Adjust for exposure suit, Supports pounds and kilograms

**Features:** macOS Compatibility

**In-app purchases:** none


### HighwayRadar

[App page](https://appshunter.io/ios/app/highwayradar/id6463768103)

This app provides real-time alerts for speed traps, cameras, and aircraft enforcement using crowd-sourced data and a comprehensive database. It also intelligently controls compatible radar detectors, offering customizable alert modes and audio notifications to enhance your driving awareness.

**Highlights:** Crowd-sourced police and camera alerts, Worldwide speed and redlight camera database, Aircraft speed enforcement alerts, Heat maps and risk score for speed traps, Intelligent radar detector control, Customizable alert modes and audio notifications

**Features:** Family Sharing, Apple Watch app

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $4.99 | per month |
| Family Discount | $14.99 | per year |
| Annual | $14.99 | per year |
| Family | $24.99 | per year |


## Frequently asked questions

### Is Buoyancy Calc free?

Buoyancy Calc is free to download, with no in-app purchases.

### Is HighwayRadar free?

HighwayRadar is free to download, with in-app purchases available.

### Which has better reviews, Buoyancy Calc or HighwayRadar?

HighwayRadar is rated higher. Buoyancy Calc averages 3.1 out of 5 from 25 ratings, while HighwayRadar averages 4.6 from 151 ratings.

### Do Buoyancy Calc or HighwayRadar have ads?

Neither Buoyancy Calc nor HighwayRadar shows ads.

### Which is updated more often, Buoyancy Calc or HighwayRadar?

Buoyancy Calc ships an update every 3 months, and HighwayRadar every 9 days. Most recently, Buoyancy Calc was updated on November 3, 2026 and HighwayRadar on November 3, 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.*