InPlan is a free iPhone app developed by Idan Ben Shalom that allows users to easily plan and preview their Instagram feed. With this app, users can schedule future posts on their Instagram account and get reminders when it's time to publish.

The main features of InPlan include the ability to preview the Instagram feed nearby the planned ones, connect multiple Instagram accounts and plan multiple feeds separately, and arrange the order of planned posts using a simple drag and drop interface. Users can also write captions in their post plannings, and the caption will be copied to their clipboard when they publish on their account.

In addition, InPlan offers exclusive features such as auto-syncing with the Instagram feed, auto-deleting planned posts after publishing, and custom fonts for captions. The app also includes a calendar view for previewing scheduled posts and a multi-selection feature for easily editing multiple posts at once.

Please note that some features are only available with the InPlan Pro subscription, which can be purchased within the app.