# app4sail vs Celestial Nav

The clearest difference is price: Celestial Nav at Free against app4sail's $4.99. Celestial Nav also leads on update cadence (every 3 weeks vs every 4 months). app4sail's advantage is in-app purchases (none vs 6) and iOS requirement (12.0 vs 15.0). On ads and device support there is nothing between them.

Celestial Nav is free to download; app4sail costs $4.99 up front. Celestial Nav sells 6 in-app purchases, starting at $1.99 per month. app4sail asks for nothing beyond the download.

app4sail ships an update every 4 months, Celestial Nav every 3 weeks. The most recent releases landed on June 7, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | app4sail | Celestial Nav |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | — | **[4.3 (10 ratings)](https://appshunter.io/ios/app/celestial-nav/id1569880598/reviews)** |
| Number of ratings | — | **10** |
| Positive reviews | — | 58.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 10 MB | 20 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [anton van oosten](https://appshunter.io/developer/641322651) | [Skytip LLC](https://appshunter.io/developer/1569880600) |

## What reviewers say

### app4sail

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

**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 app4sail free?

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

### Is Celestial Nav free?

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

### Do app4sail or Celestial Nav have ads?

Neither app4sail nor Celestial Nav shows ads.

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

app4sail ships an update every 4 months, and Celestial Nav every 3 weeks. Most recently, app4sail was updated on June 7, 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.*