This paper presents a healthcare mobile app for caregivers of dementia patients. The app had been implemented to run on wearable and mobile devices, and it helps caregivers to take dementia test, review dementia test history, and search location of public health centers in the vicinity. The collective purpose of these features is to provide meaningful healthcare services to elderly at risk of dementia. The app uses the time and change (T&C) test for screening for dementia. The app was tried for its validity and usability for the intended purpose, and participating users were surveyed to evaluate its usefulness.