The best alternatives to PostMuse for Instagram are Craftwork Design, Projector, and Keynotopia. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of PostMuse for Instagram?
General Collaboration— One inbox for all your work discussions
High-quality UX/UI and Wireframe Kits, Illustrations, Templates, and Mockups to make your design workflow faster and easier. Craftwork is a small team of designers and developers. We create our own design stuff and follow new cool products around the internet.
InstaaSnap is a open-source Instagram post saver API, WebApp, iOS and Andoid app. I created it to save some important feeds from Instagram. It's Privacy-friendly, no database, no analytics, no logs, no cookies, plus open-source.