# Sight Calc vs Ditch

The clearest difference is price: Ditch at Free against Sight Calc's $1.99. Ditch also leads on update cadence (monthly vs every 11 months) and chart position (#189 vs unranked). Sight Calc's advantage is rating (5.0 vs 3.9) and in-app purchases (none vs 2). On ads, device support and iOS requirement there is nothing between them.

Ditch is free to download; Sight Calc costs $1.99 up front. Ditch sells 2 in-app purchases, starting at $24.99 per year. Sight Calc asks for nothing beyond the download.

Sight Calc holds the better App Store score, 5.0 against 3.9. Both are backed by a comparable volume of ratings — 7 and 22 respectively. Written reviews point the same way: 82% of Sight Calc's written reviews are positive against 64% of Ditch's.

Sight Calc ships an update every 11 months, Ditch monthly. The most recent releases landed on September 10, 2026 and August 4, 2026 respectively.

## The numbers

| Metric | Sight Calc | Ditch |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[5.0 (7 ratings)](https://appshunter.io/ios/app/sight-calc/id497809138/reviews)** | [3.9 (22 ratings)](https://appshunter.io/ios/app/ditch-boat-navigation/id1667064532/reviews) |
| Number of ratings | 7 | **22** |
| Positive reviews | **82.4% of reviews** | 64.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Monthly** |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | — | **#189** |
| Size | 1 MB | 72 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [NUVOCOM INCORPORATED](https://appshunter.io/developer/497809141) | [Extent Devices LLC](https://appshunter.io/developer/1665685027) |

## 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


### Ditch

[App page](https://appshunter.io/ios/app/ditch-boat-navigation/id1667064532)

**Currently charting:** #189 Top Grossing · Navigation (US App Store)

Enhance your boating experience with intelligent routing and accurate arrival time predictions. Visualize historical vessel traffic and customize charts for a personalized view of waterways, ensuring safer and more confident journeys on the water.

**Highlights:** AI-powered smart routing, Accurate ETA predictions, Historical AIS data visualization, Customizable marine charts, Live navigation view, Up-to-date waterway information

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ditch Student Subscription | $24.99 | per year |
| Ditch Annual iOS Subscription | $29.99 | per year |


## Frequently asked questions

### Is Sight Calc free?

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

### Is Ditch free?

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

### Which has better reviews, Sight Calc or Ditch?

Sight Calc is rated higher. Sight Calc averages 5.0 out of 5 from 7 ratings, while Ditch averages 3.9 from 22 ratings.

### Do Sight Calc or Ditch have ads?

Neither Sight Calc nor Ditch shows ads.

### Which is updated more often, Sight Calc or Ditch?

Sight Calc ships an update every 11 months, and Ditch monthly. Most recently, Sight Calc was updated on September 10, 2026 and Ditch on August 4, 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.*