# AnchorChainCalculator vs Plan M8

The clearest difference is price: Plan M8 at Free against AnchorChainCalculator's $12.99. AnchorChainCalculator's advantage is iOS requirement (10.0 vs 15.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Plan M8 is free to download; AnchorChainCalculator costs $12.99 up front. Neither carries in-app purchases, so what you see is what you pay.

AnchorChainCalculator ships an update every 3 weeks, Plan M8 fortnightly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | AnchorChainCalculator | Plan M8 |
| --- | --- | --- |
| Price | $12.99 | **Free** |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/anchorchaincalculator/id1533741243/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | Paid | — |
| Size | 12 MB | 51 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) | [coara OU](https://appshunter.io/developer/1494296868) |

## 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


### Plan M8

[App page](https://appshunter.io/ios/app/plan-m8/id1545925254)

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

**In-app purchases:** none


## Frequently asked questions

### Is AnchorChainCalculator free?

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

### Is Plan M8 free?

Plan M8 is free to download, with no in-app purchases.

### Do AnchorChainCalculator or Plan M8 have ads?

Neither AnchorChainCalculator nor Plan M8 shows ads.

### Which is updated more often, AnchorChainCalculator or Plan M8?

AnchorChainCalculator ships an update every 3 weeks, and Plan M8 fortnightly. Most recently, AnchorChainCalculator was updated on October 24, 2026 and Plan M8 on October 25, 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.*