# HSI vs crewmath.

The clearest difference is in-app purchases: crewmath. at none against HSI's 1. crewmath. also leads on update cadence (every 4 days vs every 2 months). HSI's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. HSI sells 1 one-off in-app purchase. crewmath. asks for nothing beyond the download.

HSI ships an update every 2 months, crewmath. every 4 days. The most recent releases landed on July 27, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | HSI | crewmath. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (5 ratings)](https://appshunter.io/ios/app/hsi-instrument-approach-sim/id1278956934/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 16 MB | 3 MB |
| Requires iOS | **16.4** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [NATHAN STANKEVICIUS](https://appshunter.io/developer/923933206) | [Breydon Verryt-Reid](https://appshunter.io/developer/1671484251) |

## What reviewers say

### HSI

[App page](https://appshunter.io/ios/app/hsi-instrument-approach-sim/id1278956934)

Practice instrument approaches with realistic HSI displays and customizable navigation modes. Import your own approach plates to fly procedures as published. This app is designed for student pilots, instrument-rated pilots, and flight instructors.

**Highlights:** Import custom PDF approach plates, Realistic HSI instrument display, Multiple navigation modes (VOR, TACAN, LOC, NDB), Fix to Fix (Point to Point) training, Adjustable speed control for practice, Privacy-focused with zero data collection

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Upgrade | $9.99 | one-time |


### crewmath.

[App page](https://appshunter.io/ios/app/crewmath/id1671484249)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HSI free?

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

### Is crewmath. free?

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

### Do HSI or crewmath. have ads?

crewmath. shows ads; HSI does not.

### Which is updated more often, HSI or crewmath.?

HSI ships an update every 2 months, and crewmath. every 4 days. Most recently, HSI was updated on July 27, 2026 and crewmath. on September 14, 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.*