Comparison

MMO Range Finder vs Twind

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

MMO Range Finder

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
Read full description

Marine Mammal Observers mitigate for the potential impact of sound exposure on marine fauna during geophysical surveys, naval active-sonar exercises, UXO clearance or civil engineering projects. This app will assist the MMO making mitigation decisions by calculating the distance from the animal to the source of acoustic interference using a trigonometric cosine function. The MMO simply enters the distance and bearing to the TARGET and SOURCE from their observation position and the app calculates the rest. This app is loaded with features to make allow to keep focused on the detection (See the user manual for a detailed description): Fix compass bearing to animal and source by pointing device and pressing button. Convert binocular reticules to distance by entering the number of reticules between horizon and animal and pressing the reticule button (per formulae in Lerczack and Hobbs, 1998). Set up to 3 unique observation locations to define height above sea level (required for accurate reticule conversion). Save data to the log for each sighting and export in .csv format for your own mapping and analyses needs. Shows vessel position, mitigation zone and projected fauna sightings on the map. Map also displays latitude, longitude, course and speed. Press the radar button and the map will orientate to the vessel point of view. Sightings labels will be updated live with the distance to source and the bearing from the vessel for ease of re-sighting. Fully customise the MMO parameters. Specify anything from your binocular MILs per reticule, mitigation zone size, choose a ramform hull as your maps ship symbol and much much more! Disclaimer: MMO Range Finder App should be used as a reference tool and is only as precise as the users ability to range find. Any decision making is the responsibility of the user. If in use, the compass and GPS location should be verified often.

About

Twind

Features
Read full description

Nuestra aplicación móvil está cuidadosamente diseñada para controlar y registrar los accesos de trabajadores, vehículos y equipos de proveedores, contratistas y visitas sin importar tu ubicación o conexión a internet. Garantizando que solo acceden a tus instalaciones aquellos proveedores que cumplen con tus requisitos y estándares. Para evitar riesgos y maximizar la eficiencia y la seguridad. Aquí tienes algunas de las principales funciones que puedes hacer desde la aplicación: Búsqueda sencilla Encuentra rápidamente a los trabajadores, vehículos y equipos de trabajo en la puerta con nuestro robusto sistema de búsqueda. Escanea códigos QR de sus tarjetas identificativas o introduce los datos manualmente para verificar si cumplen con tus requisitos de acceso. Autorización – Rechazo del Acceso Obtén información instantánea sobre el estado de acceso. Si el recurso cumple con tus requisitos documentales, se permite el registro de entrada en un par de clicks. De lo contrario, se proporciona un listado de motivos para la denegación de acceso. Registrar Accesos y Salidas Registra fácilmente la entrada y salida del personal con un par de clics. Obtén informes detallados sobre quién ha accedido a tus centros y cuánto tiempo han permanecido en ellos, en cualquier momento que lo necesites. Modo Offline Accede a la información del personal externo incluso sin conexión a internet. Twind obtiene periódicamente la información de nuestros servidores y la guarda en su memoria para que puedas verificarla en modo offline. Listado de Entradas – Salidas Conoce en tiempo real qué recursos están en tus instalaciones, incluyendo una opción de listado de emergencia para situaciones críticas y de emergencia. Tarjeta de Acceso QR Tu proveedor descarga la tarjeta de acceso QR de Twind y la entrega a sus trabajadores. Escanea la tarjeta QR con tu móvil para verificar el cumplimiento de la documentación y registrar el acceso de manera rápida y segura. Supervisión de los trabajos Escaneando la Tarjeta QR del trabajador externo, puedes verificar de manera visual si posee el rol asignado para el trabajo en cuestión, como, por ejemplo, trabajo en altura. Este proceso mejora significativamente la supervisión en el campo.

Screenshots

MMO Range Finder4 screens
Twind4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
MMO Range Finder versus Twind: the parameters behind the verdict, then further details
ParameterMMO Range FinderTwind
Price$0.99Free — better
Rating5.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 2 monthsFortnightly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS10.3 — better15.1
Further details — not scored
Size43 MB27 MB
Age rating4+17+
DeveloperJames KeatingCTAIMA

In-app purchases

None

MMO Range Finder

No in-app purchases

None

Twind

No in-app purchases

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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