Later - Schedule for Instagram is a powerful social media scheduling app that helps brands, businesses and influencers plan, schedule, and post their Instagram content. With Later, users can easily plan, manage, and optimize their Instagram content from one place. The app allows users to easily create captivating visuals with their library of templates and editing tools, collaborate with team members, and schedule posts for the future. Later also provides powerful analytics and insights that help users measure the performance of their posts and better understand their audience. With Later, users can save time, stay organized, and reach their Instagram goals.
Hopper actually publishes for you. It is not another 'reminder' tool. They also publish with the official app, not the private API. So they are safe to use.