PicMerger is a free photo editing app that allows you to create beautiful photos and collages all on your iPhone.
I've been using PostBuilder (used to be called gramspacer) for several months now and I use it almost every single work day. PostBuilder makes it super convenient for organizing and planning content for my Instagram pages and the founder is very responsive if you have questions or if there's ever an issue. I definitely recommend them!
Drake Shake - Shake to add Drake to any photo
StoriesStudio App - StoriesStudio allows you to take a long video and cut it down into separate clips that can then be uploaded to Instagram stories, WhatsApp, TikTok, and more.
Instagram Line Break - Simple clean line breaks for your Instagram captions
Drake Captions - Find the perfect Drake lyric for your Instagram caption
HiddenVault - Store Pics + Vids on your iPhone with end-to-end encryption
Phototastic Collage Maker - Phototastic Collage Maker app offers features so you can combine photos in a single frame to create a collage.