Dash no, but XMR and SDC are real alternatives to BTC
A real alternative needs to have :
Focus on user-friendly usage (this means having solutions into place for Android, iPhone, Linux, Mac and Windows users or it will never get mainstraim usage)
Scalable with its transactions / users
Speedy transactions
Private transactions
Fungable as cryptocurrency
Focus on Reseach and Development
And frankly it needs to have them all in order to form a real alternative to Bitcoin.
IMHO: I feel DASH has it all, but user-friendliness is the worst part of it now. Plus DASH has decentralized governance and that is a part which makes it fat better than bitcoin in these times of full blocks.