What are some alternatives?
When comparing ShapeShift and Poloniex, you can also consider the following products
changelly - Exchange alternative cryptocurrencies.
Coinbase - Bitcoin, safe and easy.
Shiftex - Cryptocurrency Exchange at the best rate. 100+ Altcoins
Binance - Cryptocurrencies exchange platform
CoinSwitch - First cryptocurrency and altcoin exchange aggregator.
Switchain - Switchain is the easiest way to compare cryptocurrency prices.