# Sight Calc vs Compass

The clearest difference is review sentiment: Sight Calc at 82% against Compass's 33%. Sight Calc also leads on rating (5.0 vs 2.0) and in-app purchases (none vs 1). Compass's advantage is price (Free vs $1.99) and iOS requirement (10.0 vs 16.0). On update cadence, ads and device support there is nothing between them.

Compass is free to download; Sight Calc costs $1.99 up front. Compass sells 1 one-off in-app purchase. Sight Calc asks for nothing beyond the download.

Sight Calc holds the better App Store score, 5.0 against 2.0. That said, the two scores are not equally well evidenced: Sight Calc has 7 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 82% of Sight Calc's written reviews are positive against 33% of Compass's.

Sight Calc ships an update every 11 months, Compass every 8 months. The most recent releases landed on September 10, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Sight Calc | Compass |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[5.0 (7 ratings)](https://appshunter.io/ios/app/sight-calc/id497809138/reviews)** | [2.0 (1 ratings)](https://appshunter.io/ios/app/compass-pro/id551376288/reviews) |
| Number of ratings | **7** | 1 |
| Positive reviews | **82.4% of reviews** | 33.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 8 months** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 1 MB | 9 MB |
| Requires iOS | 16.0 | **10.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [NUVOCOM INCORPORATED](https://appshunter.io/developer/497809141) | [Savvas Petrou](https://appshunter.io/developer/480311109) |

## What reviewers say

### Sight Calc

[App page](https://appshunter.io/ios/app/sight-calc/id497809138)

This app is a specialized calculator for sight reductions using the Law of Cosines method. It's designed for students learning celestial navigation and requires manual input of LHA, declination, and approximate latitude.

**Highlights:** Law of Cosines sight reduction, Manual LHA, declination, and latitude input, Input as degrees/minutes or decimal degrees, Continuous computation of Hc, Z, and Zn, Supports North/South latitude and declination conventions, Clear and clear entry functions, Convert minutes to decimal degrees

**Features:** macOS Compatibility

**In-app purchases:** none


### Compass

[App page](https://appshunter.io/ios/app/compass-pro/id551376288)

This navigation tool uses your device's gyroscope for enhanced accuracy. Simply point your device at an object and tap the screen to freeze the compass bearing. It's useful for travel and outdoor activities.

**Highlights:** Gyroscope enhanced accuracy, HD Retina display, Universal App support, Tap to freeze compass, Read compass bearing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


## Frequently asked questions

### Is Sight Calc free?

Sight Calc costs $1.99, with no in-app purchases.

### Is Compass free?

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

### Which has better reviews, Sight Calc or Compass?

Sight Calc is rated higher. Sight Calc averages 5.0 out of 5 from 7 ratings, while Compass averages 2.0 from 1 ratings.

### Do Sight Calc or Compass have ads?

Neither Sight Calc nor Compass shows ads.

### Which is updated more often, Sight Calc or Compass?

Sight Calc ships an update every 11 months, and Compass every 8 months. Most recently, Sight Calc was updated on September 10, 2026 and Compass on September 19, 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.*