I asked Lose it! support about a app for W10, the reply was that there isn't going to be one for now.
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Thanks for contacting us. As you may know, Lose It! was building an app for Windows phone using a bridge from Microsoft called Project Astoria. In February 2016 Microsoft announced they would no longer provide this technology:
https://blogs.windows.com/buildinga...-on-the-developer-opportunity-and-windows-10/
We have nothing to announce in terms of native support for Windows phone or Project Islandwood support for Windows phone.
Thanks for the inquiry and have a great day.
Best,
Emma