# NRST vs Density Altitude +

The clearest difference is price: NRST at Free against Density Altitude +'s $3.99. Density Altitude +'s advantage is review sentiment (88% vs 47%) and in-app purchases (none vs 6). On update cadence, ads and device support there is nothing between them.

NRST is free to download; Density Altitude + costs $3.99 up front. NRST sells 6 in-app purchases, starting at $0.99 per year. Density Altitude + asks for nothing beyond the download.

Density Altitude + holds the better App Store score, 4.8 against 4.5. That said, the two scores are not equally well evidenced: Density Altitude + has 1K ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 47% of NRST's written reviews are positive against 88% of Density Altitude +'s.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on September 14, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | NRST | Density Altitude + |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [4.5 (8 ratings)](https://appshunter.io/ios/app/nrst/id828514590/reviews) | **[4.8 (1K ratings)](https://appshunter.io/ios/app/density-altitude-plus/id994402197/reviews)** |
| Number of ratings | 8 | **1K** |
| Positive reviews | 46.9% of reviews | **87.5% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | Subscription | **Free** |
| Best chart rank | — | **#37** |
| Size | 50 MB | 4 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Toonsy Net](https://appshunter.io/developer/319239704) | [Rate Of Climb Industries](https://appshunter.io/developer/528748185) |

## What reviewers say

### NRST

[App page](https://appshunter.io/ios/app/nrst/id828514590)

This app helps pilots navigate by providing essential airport information, including distance, elevation, and required descent rates. It offers real-time data updates and customizable descent settings for various aircraft types. Worldwide airport coverage is available, with daily database updates.

**Highlights:** Real-time airport data, Customizable descent rate, Worldwide airport coverage, Filter airports by runway, Glide distance calculation, Watch app integration

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Early Adopter Device Subscription | $0.99 | per year |
| Early Adopter Device and Watch Bronze | $1.99 | per year |
| Device Only | $11.99 | per year |
| Device Only | $14.99 | per year |
| Device and Watch | $17.99 | per year |
| Device and Watch | $24.99 | per year |


### Density Altitude +

[App page](https://appshunter.io/ios/app/density-altitude-plus/id994402197)

**Currently charting:** #37 Top Paid · Navigation (US App Store)

This app calculates density altitude and other atmospheric data using location, GPS, and onboard sensors. It's accurate even without a cellular connection and useful for pilots, racers, and sports enthusiasts.

**Highlights:** Density Altitude calculation, Relative Air Density (RAD), Altimeter setting, Humidity calculations, GPS and barometer integration, Location search, Offline functionality

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Great app for simplicity and ease of use
- 🔒 No data collected from the app
- 👍 Accurate and consistent
- 👍 Excellent for car racing
- 👍 Provides increased satellite accuracy

**What reviewers complain about**

- 🐛 GPS elevation doesn't always update reliably
- 🔧 Can't manually change location

**Reported bugs**

- GPS elevation doesn't always update reliably
- No way to set altitude

**Requested features**

- Apple Watch Widget
- Barometric pressure
- Relative humidity for current location
- Ability to manually enter values


## Frequently asked questions

### Is NRST free?

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

### Is Density Altitude + free?

Density Altitude + costs $3.99, with no in-app purchases.

### Which has better reviews, NRST or Density Altitude +?

Density Altitude + is rated higher. NRST averages 4.5 out of 5 from 8 ratings, while Density Altitude + averages 4.8 from 1K ratings.

### Do NRST or Density Altitude + have ads?

Neither NRST nor Density Altitude + shows ads.

### Which is updated more often, NRST or Density Altitude +?

NRST ships an update every 4 months, and Density Altitude + every 4 months. Most recently, NRST was updated on September 14, 2026 and Density Altitude + on September 24, 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.*