# Perpetual Nautical Almanac vs Sextant

The clearest difference is review sentiment: Perpetual Nautical Almanac at 38% against Sextant's 0%. Perpetual Nautical Almanac also leads on price ($6.99 vs $9.99) and iOS requirement (17.6 vs 26.0). Sextant's advantage is update cadence (every 5 weeks vs every 9 months). On ads, in-app purchases, monetization model and device support there is nothing between them.

Perpetual Nautical Almanac costs $6.99 and Sextant $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Perpetual Nautical Almanac ships an update every 9 months, Sextant every 5 weeks. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Perpetual Nautical Almanac | Sextant |
| --- | --- | --- |
| Price | **$6.99** | $9.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/perpetual-nautical-almanac/id1483007345/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | **37.5% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 5 weeks** |
| Monetization | Paid | Paid |
| Size | 26 MB | 2 MB |
| Requires iOS | **17.6** | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [RPA Technologies](https://appshunter.io/developer/1317678667) | [Stolk.cc](https://appshunter.io/developer/313529099) |

## 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


### Sextant

[App page](https://appshunter.io/ios/app/sextant-celestial-nav/id6758679821)

This app provides a comprehensive celestial navigation toolkit for sailors and enthusiasts. It allows users to navigate using celestial bodies like the sun, moon, planets, and stars, even when GPS is unavailable. The app guides users through taking sextant readings, performing calculations, and plotting positions on a map.

**Highlights:** Celestial body identification using camera and ephemeris, Sextant sight reduction with manual correction checks, Offline celestial navigation, Noon sight for latitude calculation, Line of position plotting on a real map, Polaris one-shot latitude, Solar Compass for deviation checks

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

**In-app purchases:** none


## Frequently asked questions

### Is Perpetual Nautical Almanac free?

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

### Is Sextant free?

Sextant costs $9.99, with no in-app purchases.

### Do Perpetual Nautical Almanac or Sextant have ads?

Neither Perpetual Nautical Almanac nor Sextant shows ads.

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

Perpetual Nautical Almanac ships an update every 9 months, and Sextant every 5 weeks. Most recently, Perpetual Nautical Almanac was updated on November 3, 2026 and Sextant on October 31, 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.*