No. You can download the published final package from InstaVR and publish through your iOS or Android developer accounts.
You can get latest updates from InstaVR
InstaVR is a virtual reality focused technology company, providing tools and services to enable professionals to author and publish interactive VR experiences. InstaVR is completely web-based and requires no specialized engineering knowledge. Over 10,000 clients have signed up for InstaVR, creating thousands of immersive 360 degree apps for iOS, Android, WebVR, Gear VR, Oculus Rift, HTC VIVE, Google Daydream, etc.