Neither Google Tag Manager nor Bitly offers a free trial.
Google Tag Manager is designed for Large Enterprises, Medium Business and Small Business.
Bitly is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
The starting price of Bitly begins at $21/Month when Billed Yearly, while pricing details for Google Tag Manager are unavailable.
Some top alternatives to Google Tag Manager includes Viraltag, Launch by Adobe, TagCommander, Tag Governance, Tealium iQ, Google Analytics, GingerTag, TapAnalytics, Tagmate and Scale8.
Some top alternatives to Bitly includes Rebrandly, Geniuslink, ShortURL, Cutt.ly, MyShorten, TinyURL, Short.io, Switchy, Linkjoy and MyLinks On Acalytica.