# app4sail vs Celestial Navigator

The clearest difference is price: Celestial Navigator at Free against app4sail's $4.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

Celestial Navigator is free to download; app4sail costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

app4sail ships an update every 4 months, Celestial Navigator every 9 months. The most recent releases landed on September 17, 2026 and August 12, 2026 respectively.

## The numbers

| Metric | app4sail | Celestial Navigator |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | — | **[2.0 (3 ratings)](https://appshunter.io/ios/app/celestial-navigator/id696927722/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 42.9% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 9 months |
| Monetization | — | Free |
| Size | 10 MB | 32 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [anton van oosten](https://appshunter.io/developer/641322651) | [Omar reis](https://appshunter.io/developer/687921629) |

## What reviewers say

### app4sail

[App page](https://appshunter.io/ios/app/app4sail/id641578574)

**Features:** macOS Compatibility

**In-app purchases:** none


### Celestial Navigator

[App page](https://appshunter.io/ios/app/celestial-navigator/id696927722)

This app assists with celestial navigation training by providing a perpetual almanac, star finder chart with animation, and tools for calculating lines of position and meridian passages. It can utilize device sensors for real-time chart positioning, though a marine sextant is still required for actual navigation.

**Highlights:** Perpetual almanac, Animated star finder chart, Line of position calculation, Meridian passage calculation, Real-time sensor integration, Celestial object data

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is app4sail free?

app4sail costs $4.99, with no in-app purchases.

### Is Celestial Navigator free?

Celestial Navigator is free to download, with no in-app purchases.

### Do app4sail or Celestial Navigator have ads?

Neither app4sail nor Celestial Navigator shows ads.

### Which is updated more often, app4sail or Celestial Navigator?

app4sail ships an update every 4 months, and Celestial Navigator every 9 months. Most recently, app4sail was updated on September 17, 2026 and Celestial Navigator on August 12, 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.*