# MMO Range Finder vs Twind

The clearest difference is price: Twind at Free against MMO Range Finder's $0.99. Twind also leads on update cadence (fortnightly vs every 2 months). MMO Range Finder's advantage is iOS requirement (10.3 vs 15.1). On ads, in-app purchases and device support there is nothing between them.

Twind is free to download; MMO Range Finder costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

MMO Range Finder ships an update every 2 months, Twind fortnightly. The most recent releases landed on November 2, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | MMO Range Finder | Twind |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/mmo-range-finder/id1258748649/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | Paid | — |
| Size | 43 MB | 27 MB |
| Requires iOS | **10.3** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [James Keating](https://appshunter.io/developer/1258748648) | [CTAIMA](https://appshunter.io/developer/1692514367) |

## What reviewers say

### MMO Range Finder

[App page](https://appshunter.io/ios/app/mmo-range-finder/id1258748649)

This app helps Marine Mammal Observers calculate distances between animals and acoustic sources during surveys. It uses trigonometric functions and allows users to input target and source bearings and distances for precise mitigation decisions.

**Highlights:** Calculate distance using trigonometric cosine function, Fix compass bearing by pointing device, Convert binocular reticules to distance, Set up to 3 unique observation locations, Save and export sighting data in .csv format, Display vessel position, mitigation zone, and sightings on map, Customise MMO parameters

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

**In-app purchases:** none


### Twind

[App page](https://appshunter.io/ios/app/twind/id6478852745)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is MMO Range Finder free?

MMO Range Finder costs $0.99, with no in-app purchases.

### Is Twind free?

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

### Do MMO Range Finder or Twind have ads?

Neither MMO Range Finder nor Twind shows ads.

### Which is updated more often, MMO Range Finder or Twind?

MMO Range Finder ships an update every 2 months, and Twind fortnightly. Most recently, MMO Range Finder was updated on November 2, 2026 and Twind on November 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.*