What are some alternatives?

When comparing Droid Transfer and CopyTrans, you can also consider the following products

AirDroid
– Access Android phone/tablet from computer remotely and securely. Manage SMS, files, photos and videos, WhatsApp, Line, WeChat and more on computer.

iMazing
– iMazing lets you transfer music, files, messages, apps and more from any iPhone, iPad, or iPod to a computer, Mac or PC. Manage and backup your iOS device simply without iTunes. (was DiskAid)

Coolmuster Android Backup Manager
– Coolmuster Android Backup Manager is the one-stop backup and restore software for Android data, which enables you to back up and restore Android data with 1 click, such as contacts, SMS, call logs, media files, etc.

i-FunBox
– General file management software for iPhone and other Apple products

Coolmuster Android Assistant
– Coolmuster Android Assistant is a professional Android managing program for Android users to manage Android contacts, text messages, media, apps, etc. freely on Windows PC. Learn more by checking in.

iExplorer
– iExplorer lets you easily transfer music, playlists, text messages, files and more from any iPhone, iPod, or iPad to a Mac or Windows computer and iTunes.