Erdo is a company that focus on developing programs for primary ear and hearing care all around the world. The project name, erdo, comes from the word "耳朵"(pronounced er-dou) which means "ear" in Chinese.! Erdo offers free online audiometry, largely reducing the barriers for one to know his/her ears. The test takes only three minutes to go through, and can be taken anywhere. Results are saved on our cloud service, so the well-being of one's ears becomes fully tracked. Erdo provides customized suggestions after the test; in case of hearing impairment, Erdo's collaboration with local hearing aid providers will lead the patient to find the most suitable solution in no time.!