Sympli is a collaboration platform that allows you to create visually-rich prototypes, review them in real-time with stakeholders, and streamline the product development process.
It is a tool for designers to design, developers to develop, quality assurance to test and product managers to manage projects from start to finish.
The Trello power-up lets you upload your Sympli Comments directly to Trello boards.
Overall, it's simple to use and does exactly what we need for our projects. The sketch plugin is really simple to use and reduces the amount of time it takes to send designs to the development team. The plugins are seamless, support is rapid, and it's simple to share with your team. Annotations make it simple to convey changes in versions or to answer and dev queries.