Thumbnail Studio for YouTube, developed by Edouard Barbier, is a free multimedia app available on the iPhone. The app helps YouTubers and Twitch streamers to create high-performing and eye-catching thumbnails for their videos and stream covers. The app offers a wide range of features including background removal to create stickers, a gallery of stickers, 300+ fonts and styles, and support for layers just like in Photoshop.

One of the most significant features of the app is the ability to keep your templates handy to reuse them anytime you upload new videos. Additionally, iPad users can use their Pencils to create and edit thumbnails. The app also provides access to millions of pictures thanks to their friends at Unsplash. The app does not collect any data when in use and everything stays on your device.

Overall, Thumbnail Studio for YouTube is an excellent app for YouTubers and Twitch streamers who want to create professional-looking thumbnails for their videos and stream covers. The app's user-friendly interface and multiple features make it a must-try for content creators looking to enhance their branding.