What are the best apps for Instagram optimization?

Question

Looking for the best apps that help you connect with a targeted audience, increases your engagement and allows you to collaborate with other creators on Instagram.

Example: A Instagram service exchange. Where you can exchange likes 4 likes, follow 4 follows, comments, tags in stories, etc... by REAL targeted users.

Antonio Bustamante · Accepted Answer

Instagram has been cracking down on apps made to auto-like/follow etc, so a lot of functionality has disappeared from these services. I use Iconosquare, specifically their Influencers product, to do advanced searches on best accounts based on certain demographics. https://pro.iconosquare.com/features/influencer

Gigi Rodgers · Answer

I freakin' love this tool. Looking at when the best time is for me to post my photos/videos will really help me determine the best strategy moving forward. 
They have all the analytics I need and then some.

Antonio Bustamante · Answer

Same with Crowdfire. A lot of their functionality was capped by Instagram, but some of it is still there, it's useful, and it's a much simpler tool (and cheaper) than Iconosquare.

Alberto Moral · Answer

With InstaMetrics you can see your most valuable users, and discover your engagement

Pulkit Agrawal · Answer

Latergramme (now just Later) is a pretty sophisticated solution to manage Instagram posting, especially across accounts. It might be more targeted for the business user, but might be worth evaluating in your search!