# AnchorChainCalculator vs PredictWind Tracker

The clearest difference is review sentiment: AnchorChainCalculator at 100% against PredictWind Tracker's 0%. AnchorChainCalculator also leads on rating (5.0 vs 4.4) and in-app purchases (none vs 3). PredictWind Tracker's advantage is price (Free vs $12.99). On ratings volume, ads and device support there is nothing between them.

PredictWind Tracker is free to download; AnchorChainCalculator costs $12.99 up front. PredictWind Tracker sells 3 in-app purchases, starting at $49.00 per month. AnchorChainCalculator asks for nothing beyond the download.

AnchorChainCalculator holds the better App Store score, 5.0 against 4.4. Both are backed by a comparable volume of ratings — 5 and 7 respectively. Written reviews point the same way: 100% of AnchorChainCalculator's written reviews are positive against 0% of PredictWind Tracker's.

AnchorChainCalculator ships an update every 3 weeks, PredictWind Tracker every 2 months. The most recent releases landed on October 8, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | AnchorChainCalculator | PredictWind Tracker |
| --- | --- | --- |
| Price | $12.99 | **Free** |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/anchorchaincalculator/id1533741243/reviews)** | [4.4 (7 ratings)](https://appshunter.io/ios/app/predictwind-tracker/id6480428437/reviews) |
| Number of ratings | 5 | **7** |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 12 MB | 88 MB |
| Requires iOS | **10.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mathias Wagner](https://appshunter.io/developer/1533741245) | [PredictWind Limited](https://appshunter.io/developer/477048590) |

## What reviewers say

### AnchorChainCalculator

[App page](https://appshunter.io/ios/app/anchorchaincalculator/id1533741243)

Calculate the optimal amount of anchor chain or rope for secure anchoring based on vessel characteristics and sea conditions. Provides detailed load calculations and accounts for dynamic effects like swell and gusts. Supports both metric and imperial units, with options for chain-only or mixed rope/chain setups.

**Highlights:** Physics-based anchoring calculations, Customizable vessel and sea conditions, Chain-only or mixed rope/chain support, Load and swell absorption analysis, Metric and imperial unit support, Multiple vessel configuration storage, Basic and Expert modes

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

**In-app purchases:** none


### PredictWind Tracker

[App page](https://appshunter.io/ios/app/predictwind-tracker/id6480428437)

Automatically update your personalized GPS tracking page for real-time location sharing. Ideal for boaters, it allows friends and family to monitor your position and route with weather or satellite maps. Link to add blogs and videos for a permanent record of your journey.

**Highlights:** Automatic GPS tracking updates, Real-time location sharing, Weather and satellite map overlays, Add blogs and video links, Personalized tracking page

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PredictWind Tracker 1 Month | $49.00 | per month |
| PredictWind Tracker 3 Months | $99.00 | per 3 months |
| PredictWind Tracker 12 Months | $249.00 | per year |


## Frequently asked questions

### Is AnchorChainCalculator free?

AnchorChainCalculator costs $12.99, with no in-app purchases.

### Is PredictWind Tracker free?

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

### Which has better reviews, AnchorChainCalculator or PredictWind Tracker?

AnchorChainCalculator is rated higher. AnchorChainCalculator averages 5.0 out of 5 from 5 ratings, while PredictWind Tracker averages 4.4 from 7 ratings.

### Do AnchorChainCalculator or PredictWind Tracker have ads?

Neither AnchorChainCalculator nor PredictWind Tracker shows ads.

### Which is updated more often, AnchorChainCalculator or PredictWind Tracker?

AnchorChainCalculator ships an update every 3 weeks, and PredictWind Tracker every 2 months. Most recently, AnchorChainCalculator was updated on October 8, 2026 and PredictWind Tracker on October 5, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*