Background
Control of blood glucose levels is needed not only to alleviate symptoms of hypoglycaemia and hyperglycaemia, but also to prevent or delay diabetes‐related complications. Advice for glucose control is usually provided to patients by members of the health care team. However, many diabetes apps claim to enhance self‐management of blood glucose by providing decision support to patients when an out‐of‐range blood glucose level is recorded. In this study, we investigated the appropriateness of action prompts provided by diabetes apps for hypoglycaemia and hyperglycaemia against evidence‐based guidelines.

Methods
We used methods previously reported to identify and select diabetes apps, which were downloaded and assessed against the American Diabetes Association (ADA) guidelines. Screenshots of action prompts corresponding to low or high out‐of‐range blood glucose values were subjected to content analysis.

Results
Of 371 diabetes self‐management apps evaluated, only 217 and 216 apps alerted patients about hypoglycaemia and hyperglycaemia, respectively. Of these, 20.7% (45/217) and 15.3% (33/216) also provided action prompts. We found 5.1% of apps (hypoglycaemia: 11/217; hyperglycaemia: 11/216) provided prompts that were either too general to be helpful or not aligned with ADA guidelines. Overall, only 17.9% (39/217) and 14.8% (32/216) provided appropriate action prompts for hypoglycaemia and hyperglycaemia, respectively.

Conclusion
Less than one fifth of apps provided evidence‐based steps to guide patients through hypoglycaemia and hyperglycaemia. The majority of apps failed to provide just‐in‐time diabetes self‐management education to prevent frequent or severe episodes of hypoglycaemia and hyperglycaemia. Our findings emphasize the need for better design and quality assurance of diabetes apps.