# Beat Length Calculator vs SailViewer

The clearest difference is update cadence: SailViewer at every 3 days against Beat Length Calculator's every 2 months. Beat Length Calculator's advantage is iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Beat Length Calculator ships an update every 2 months, SailViewer every 3 days. The most recent releases landed on October 20, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Beat Length Calculator | SailViewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/beat-length-calculator/id1635014077/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 days** |
| Monetization | Free | — |
| Size | 85 MB | 37 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Egor Leonenko](https://appshunter.io/developer/1492557180) | [Master Sailing jdoo](https://appshunter.io/developer/1680451361) |

## What reviewers say

### Beat Length Calculator

[App page](https://appshunter.io/ios/app/beat-length-calculator/id1635014077)

Calculate beat lengths for dinghy classes quickly and easily. This tool uses course layout, wind speed, and target time for accurate results. It's based on data from sailing experts and other reliable sources.

**Highlights:** Dinghy class beat length calculation, Course layout input, Wind speed integration, Target time setting, Data-driven accuracy

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

**In-app purchases:** none


### SailViewer

[App page](https://appshunter.io/ios/app/sailviewer/id6801887026)

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

**In-app purchases:** none


## Frequently asked questions

### Is Beat Length Calculator free?

Beat Length Calculator is free to download, with no in-app purchases.

### Is SailViewer free?

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

### Do Beat Length Calculator or SailViewer have ads?

Neither Beat Length Calculator nor SailViewer shows ads.

### Which is updated more often, Beat Length Calculator or SailViewer?

Beat Length Calculator ships an update every 2 months, and SailViewer every 3 days. Most recently, Beat Length Calculator was updated on October 20, 2026 and SailViewer on October 30, 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.*