# Sight Calc vs Celestial Navigation

The clearest difference is rating: Sight Calc at 5.0 against Celestial Navigation's 4.2. Celestial Navigation's advantage is update cadence (every 5 days vs every 11 months) and chart position (#90 vs unranked). On price, review sentiment, ratings volume and ads there is nothing between them.

Sight Calc costs $1.99 and Celestial Navigation $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Sight Calc holds the better App Store score, 5.0 against 4.2. Both are backed by a comparable volume of ratings — 7 and 15 respectively. Written reviews point the same way: 82% of Sight Calc's written reviews are positive against 77% of Celestial Navigation's.

Sight Calc ships an update every 11 months, Celestial Navigation every 5 days. The most recent releases landed on September 10, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Sight Calc | Celestial Navigation |
| --- | --- | --- |
| Price | $1.99 | $1.99 |
| Rating | **[5.0 (7 ratings)](https://appshunter.io/ios/app/sight-calc/id497809138/reviews)** | [4.2 (15 ratings)](https://appshunter.io/ios/app/celestial-navigation/id1458513224/reviews) |
| Number of ratings | 7 | **15** |
| Positive reviews | **82.4% of reviews** | 77.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 5 days** |
| Monetization | Paid | Paid |
| Best chart rank | — | **#90** |
| Size | 1 MB | 51 MB |
| Requires iOS | 16.0 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [NUVOCOM INCORPORATED](https://appshunter.io/developer/497809141) | [Dr. Harald Merkel](https://appshunter.io/developer/404381431) |

## 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


### Celestial Navigation

[App page](https://appshunter.io/ios/app/celestial-navigation/id1458513224)

**Currently charting:** #90 Top Paid · Navigation (US App Store)

This application assists with celestial navigation by performing sextant sight reduction calculations. It displays intermediate numbers for verification and can draw lines of position on a map. Features include a perpetual nautical almanac and a star finder to identify celestial bodies.

**Highlights:** Sextant sight reduction calculations, Perpetual nautical almanac, Line of position calculation and plotting, Star Finder for celestial identification, Save and manage sextant readings, Display intermediate calculation numbers

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Sight Calc free?

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

### Is Celestial Navigation free?

Celestial Navigation costs $1.99, with no in-app purchases.

### Which has better reviews, Sight Calc or Celestial Navigation?

Sight Calc is rated higher. Sight Calc averages 5.0 out of 5 from 7 ratings, while Celestial Navigation averages 4.2 from 15 ratings.

### Do Sight Calc or Celestial Navigation have ads?

Neither Sight Calc nor Celestial Navigation shows ads.

### Which is updated more often, Sight Calc or Celestial Navigation?

Sight Calc ships an update every 11 months, and Celestial Navigation every 5 days. Most recently, Sight Calc was updated on September 10, 2026 and Celestial Navigation on October 1, 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.*