All Specs Instead of searching for the nearest physical fax machine the next time you need to send a fax, consider using an online fax service. Fax.Plus is a top-notch service that offers flexible pricing, a free tier, and excellent mobile apps. It even implements features such as document signing (though only via the mobile apps) and fax scheduling. Fax.Plus did not handle sending a graphics-heavy test document well in testing, however. Despite that issue, it still does enough to earn our Editors' Choice endorsement alongside HelloFax, since both are modern, simple to use, and offer intuitive interfaces.