A multi-country study assessing the accuracy of an app, OptiBP, which estimates blood pressure through the camera of a smartphone by reading optical pulse waves was rolled out.  

It was identified by WHO as innovative health technology for low-resource settings, that will be incorporated into the health system during routine antenatal care.  

It will be one of the digital health interventions for health system strengthening but needs evaluation and evidence for its appropriate integration.  

The study will evaluate these tools effectiveness and accuracy in as many contexts as possible in future.