A number of organisations are now using open data platforms driven by IATI data, marking an important shift from publishing raw data to visualising it in a meaningful way. The Netherlands is using its own information for internal management and reporting purposes and is working with two of its partner organisations publishing to IATI in order to stimulate exchange and learning, with the longer-term aim of including open data throughout its supply chains. Pilot studies on data use in-country and the work linking development flows to recipient country budgets via the IATI budget identifier hold great promise for unlocking the potential of IATI. However, these efforts risk being undermined by those donors that are failing to deliver on their commitments. In order to realise the transformative potential of open data in improving development effectiveness, the donor community needs to work together to drive forward collective action on aid transparency and learn from emerging best practice on data use.