Yes, both Moji and Zupyak offer a Free Trial.
Pricing for Moji Starts at $9.99/month whereas for Zupyak Starts at $49/month.
Moji offers several advantages, including Available on iOS devices, Range of topics, Email templates feature, Blog and essay writing feature, Code suggestions feature and many more functionalities.
The cons of Moji may include a iOS exclusive, No Android version, Subscription based features, Limited to English. and No trial period