The best alternatives to Chattery are Instagram, Anima App, and Gifski. If these 3 options don't work for you, we've listed a few more alternatives below.
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Tanka— Tanka = Slack + Glean, built for fast-growing startups.
gifski converts video frames to GIF animations using pngquant's fancy features for efficient cross-frame palettes and temporal dithering. It produces animated GIFs that use thousands of colors per frame.
Gifs.com is the fastest way to create animated gifs from Youtube, Facebook, Vimeo and other video sites. Just upload your own video or paste in a URL and click create a gif.