Lavatory Log - お通じは美容と健康の基本 is a free iPhone application developed by Ken Mayumi. It falls under the category of Lifestyle and specifically belongs to the Health & Fitness subcategory. The app aims to help users keep track of their digestive health in a stylish and convenient way.

With just a push of a button, you can record your daily bowel movements. The app stores up to three years' worth of logs, allowing you to analyze your recent bowel movement patterns, including the condition and timing. This information can be helpful in improving your gut health.

Even with a healthy diet and exercise, if your body is not effectively detoxifying, it can lead to an unhealthy state with unnecessary substances remaining inside. By keeping a record of your diet and exercise along with your bowel movements, you can analyze your personal tendencies, such as when you are more prone to constipation or diarrhea. This can be a useful tool for managing your lifestyle.

Additionally, the app includes a feature that plays the sound of flowing water, providing a convenient way to mask any unwanted noises in the bathroom.