Providing high-quality feedback is essential for improving preservice teacher performance. Rather than post-lesson feedback, immediate performance feedback while teaching is considered effective. This article reports on developing and piloting a standardised tool for synchronous feedback. Eight teacher educators from a Dutch higher education institution were trained to use the tool (based on accepted models of teacher roles, observation criteria and feedback levels) with pre-recorded lessons. Interobserver reliability was good for teacher roles and sufficient for feedback levels. Positive evaluations of the tool and educators’ interest in its application, warrant further research into scalability and effectiveness of synchronous feedback delivery.