# Perpetual Nautical Almanac vs Celestial Nav

The clearest difference is price: Celestial Nav at Free against Perpetual Nautical Almanac's $6.99. Celestial Nav also leads on update cadence (every 3 weeks vs every 9 months) and review sentiment (60% vs 38%). Perpetual Nautical Almanac's advantage is rating (5.0 vs 4.3) and in-app purchases (none vs 6). On ads, device support and iOS requirement there is nothing between them.

Celestial Nav is free to download; Perpetual Nautical Almanac costs $6.99 up front. Celestial Nav sells 6 in-app purchases, starting at $1.99 per month. Perpetual Nautical Almanac asks for nothing beyond the download.

Perpetual Nautical Almanac holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: Celestial Nav has 10 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 38% of Perpetual Nautical Almanac's written reviews are positive against 60% of Celestial Nav's, so the app with the better star average is not the one people write more warmly about.

Perpetual Nautical Almanac ships an update every 9 months, Celestial Nav every 3 weeks. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Perpetual Nautical Almanac | Celestial Nav |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/perpetual-nautical-almanac/id1483007345/reviews)** | [4.3 (10 ratings)](https://appshunter.io/ios/app/celestial-nav/id1569880598/reviews) |
| Number of ratings | 1 | **10** |
| Positive reviews | 37.5% of reviews | **60.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 26 MB | 21 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | +4 |
| Developer | [RPA Technologies](https://appshunter.io/developer/1317678667) | [Skytip LLC](https://appshunter.io/developer/1569880600) |

## What reviewers say

### Perpetual Nautical Almanac

[App page](https://appshunter.io/ios/app/perpetual-nautical-almanac/id1483007345)

Calculate precise celestial positions for navigation from 1900 to 2050. Get real-time data on the Sun, Moon, planets, and stars, including rise/set times and atmospheric corrections.

**Highlights:** Real-time celestial body positions, Sunrise/sunset and moonrise/moonset calculations, Sunlight world map with celestial positions, Moon phase and age, Planet and star GHA/dec, Atmospheric refraction and dip corrections

**In-app purchases:** none


### Celestial Nav

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

This tool provides comprehensive celestial navigation calculations, including sight reductions and almanac data. It offers both basic free features for daytime sun navigation and advanced pro features for day and night use with a wide range of celestial bodies. The app is designed for offline functionality and ease of use.

**Highlights:** Celestial navigational computations, Perpetual Almanac (1600-3000), Offline functionality, High accuracy sight reductions, Sight planning and reduction tools, Save LOP calculations, Map display for saved LOPs

**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 Perpetual Nautical Almanac free?

Perpetual Nautical Almanac costs $6.99, with no in-app purchases.

### Is Celestial Nav free?

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

### Which has better reviews, Perpetual Nautical Almanac or Celestial Nav?

Perpetual Nautical Almanac is rated higher. Perpetual Nautical Almanac averages 5.0 out of 5 from 1 ratings, while Celestial Nav averages 4.3 from 10 ratings.

### Do Perpetual Nautical Almanac or Celestial Nav have ads?

Neither Perpetual Nautical Almanac nor Celestial Nav shows ads.

### Which is updated more often, Perpetual Nautical Almanac or Celestial Nav?

Perpetual Nautical Almanac ships an update every 9 months, and Celestial Nav every 3 weeks. Most recently, Perpetual Nautical Almanac was updated on November 7, 2026 and Celestial Nav on November 3, 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.*