# Sight Calc vs Celestial Nav

The clearest difference is price: Celestial Nav at Free against Sight Calc's $1.99. Celestial Nav also leads on update cadence (every 3 weeks vs every 11 months). Sight Calc's advantage is rating (5.0 vs 4.3) and in-app purchases (none vs 6). On ratings volume, ads, device support and iOS requirement there is nothing between them.

Celestial Nav is free to download; Sight Calc costs $1.99 up front. Celestial Nav sells 6 in-app purchases, starting at $1.99 per month. Sight Calc asks for nothing beyond the download.

Sight Calc holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 7 and 10 respectively. Written reviews point the same way: 82% of Sight Calc's written reviews are positive against 58% of Celestial Nav's.

Sight Calc ships an update every 11 months, Celestial Nav every 3 weeks. The most recent releases landed on September 10, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Sight Calc | Celestial Nav |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[5.0 (7 ratings)](https://appshunter.io/ios/app/sight-calc/id497809138/reviews)** | [4.3 (10 ratings)](https://appshunter.io/ios/app/celestial-nav/id1569880598/reviews) |
| Number of ratings | 7 | **10** |
| Positive reviews | **82.4% of reviews** | 58.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 3 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 1 MB | 20 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [NUVOCOM INCORPORATED](https://appshunter.io/developer/497809141) | [Skytip LLC](https://appshunter.io/developer/1569880600) |

## 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 Nav

[App page](https://appshunter.io/ios/app/celestial-nav/id1569880598)

This app provides tools for celestial navigation, offering computations for celestial bodies and sight reductions. It includes an offline perpetual almanac and allows for quick capture of observation data for accurate course adjustments.

**Highlights:** Celestial navigational computations, Offline perpetual almanac, Quick celestial observation data capture, High accuracy sight reductions, Sight planning and reduction tools, Celestial fix computations

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO Version | $1.99 | per month |
| PRO Version | $7.99 | per 6 months |
| PRO Version | $9.99 | per year |
| 7 Day Trial License | $0.99 | one-time |
| 30 Day Trial License | $2.99 | one-time |
| PRO Version Lifetime | $24.99 | one-time |


## Frequently asked questions

### Is Sight Calc free?

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

### Is Celestial Nav free?

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

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

Sight Calc is rated higher. Sight Calc averages 5.0 out of 5 from 7 ratings, while Celestial Nav averages 4.3 from 10 ratings.

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

Neither Sight Calc nor Celestial Nav shows ads.

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

Sight Calc ships an update every 11 months, and Celestial Nav every 3 weeks. Most recently, Sight Calc was updated on September 10, 2026 and Celestial Nav on September 13, 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.*