So many people wonder which schedulers are the best for Instagram.
Before you consider using a scheduler to need to note than any scheduler that posts automatically to Instagram may cause your account to be shut down and banned completely.
Automatic schedulers (those who post without sending your a push notification) are against Instagram TOS agreement.
Schedulers you can use safely are those that send you a "push notification". You can upload your pic, write your caption and add your hashtags within the caption, then schedule the time you want to post.
At the requested time, the scheduler will send you a message (a push notification) reminding you to post. You can then post.
Schedulers accepted by Instagram include:
I would avoid any others out there.