Hi @lasse - thank you for reaching out! beta.color.io is not the right domain, please use app.color.io and install it to your home screen following the on-screen instructions or the installation guide here: https://www.color.io/user-guide/download-and-installation

• Does that change anything?
• Do you have any (potentially very large) images loaded when this happens?
• Or does it also happen when you have no images open in the app?
• What iPhone model do you have?