Delta emulator Android equivalent

The Delta emulator is absolutely superb, particularly given that it’s free with no ads, a rarity on iOS. I’ve barely stopped playing DS games since I downloaded it. My other half is dying to have a go on her phone, but I’ve not had an Android device for ages. Has anyone got any recommendations for equivalent Android DS emulators that are free/ad-free, simple to use, and hopefully as polished as Delta that I can send her way?