Retrotool is a free to use, public retrospective online tool that allows you to quickly create a board, add ideas to sticky notes and then share the ideas with the team. It has a free plan with limited features and only allows public boards. Paid plans allow you to have up 3 or more teams and to add backgrounds to your retrospectives. RetroTool is a one page retro tool which means it does not have a facilitated workflow function. Instead, you can ask everyone if they are ready to move onto the next step. Retrotool is best used for simply, public and simple retrospectives with basic functionality.
On the other hand, TeamRetro is an enterprise-ready tool specifically built for agile retrospective and health check to improves meeting value, safety, and actionable outcomes. You can get insights for improvement and has an easy to use and reliable interface that allows retrospectives to run smoothly. Beyond simple brainstorming, TeamRetro also captures data such as team sentiment, action item tracking, team health as well as other common agile metrics. The best thing about TeamRetro is that it is simple for people to use.