The best alternatives to GIF Toaster for iOS are Gifify, Morphin, and Netflix GIFs. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
Chrome extension to create GIFs from Netflix content! Just go to Netflix, press "g" to share your screen, and the GIF will auto download (after 30 sec or so).
This is an online service used to convert video from one format to another and apply various changes to the video before converting, like trimming it or adding subtitles. Furthermore, it can convert video to audio or replace an audio track with another one.