Gathering evidence of what works in education is laborious and slow. The WhatWorked platform enables many teachers to evaluate interventions concurrently, thus adding both scale and speed to the process. All individual mini-Randomised Controlled Trials are combined into a robust evaluation, and all evaluations are gathered into a global evidence base. The platform is currently being piloted in the UK and will be introduced in the Netherlands in the school year 2024/25. The session will include a demonstration of the platform as well as results from current pilots for peer tutoring, Microsoft Reading Progress and online maths interventions.