Yes, both Previewify and Posted offer a Free Trial.
Previewify is designed for Large Enterprises, Medium Business and Small Business.
Posted is designed for Individuals, Medium Business and Small Business.
The starting price of Previewify begins at $7.50/Month when Billed Yearly, while pricing details for Posted are unavailable.
Some top alternatives to Previewify includes Bitly, ShortURL, ClickToTweet, Tapz, Short.io, Switchy, mainpage.me, Linkjoy, MyLinks On Acalytica and Thumber.
Some top alternatives to Posted includes Zoho Social, Crowdfire, SocialBee, Planable, SocialMgr, Later, Continuon, Socialdraft, Broadcast, CloudSocial, SocialHub, Send Social Media, Sociality.io, Social By Emovur and Blog To Social.