First, is an automatic alternative text so you can hear descriptions of photos through your screen reader when you use Feed, Explore and Profile. This feature uses object recognition technology to generate a description of photos for screen readers so you can hear a list of items that photos may contain as you browse the app.
Also custom alternative text so you can add a richer description of your photos when you upload a photo. People using screen readers will be able hear this description.
These are good first steps toward creating a more accessible Instagram. To learn more, check out the Instagram Help Center.