Picture Calendar is a free iPhone app developed by Piet Hein van Cleef that serves as a visual journal. With this app, users can easily create calendars filled with images and find them back by date, allowing them to keep track of changes over time.

The app offers a wide range of uses. For example, users can track their body while trying to lose weight, document the dinners they eat, record the results of expensive skincare products like eye cream and teeth whitening, monitor skin trouble, track cracks in their walls, document the growth of a bonsai plant, or capture their child's journey from infancy to adulthood. The possibilities are endless.

To enhance the user experience, Picture Calendar allows users to enable a camera overlay in the calendar settings. This feature enables users to take matching consecutive photos, creating a seamless visual representation of their chosen subject.

To ensure that users regularly add photos to their calendars, the app provides the option to set an alert for a weekly notification. This serves as a helpful reminder to capture and document moments as they happen.

Additionally, Picture Calendar offers the ability to create a PDF document containing all events or an animated GIF. This allows users to easily share and preserve their memories in a format that suits their needs.

While the app is free to try out, it does have limitations. Users are limited to creating 15 events. To unlock all features and create an unlimited number of events, users can upgrade to the Pro version.

Picture Calendar is a versatile and user-friendly app that provides a convenient way to capture and organize memories in a visual format. Whether it's tracking personal progress or documenting special moments, this app offers a valuable tool for anyone looking to create a visual journal.