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We like it, specifically because there is no animation but keeps our kids attention while encouraging reading and imagination.
You can start with the free books and upgrade to a subscription service if you like it. It supports offline downloads for trips with no internet.
Almost anything from the Sago Mini line of apps is a hit with the kids and parents, but my favourite for young kids has to be Doodlecast. The app starts by posing kids a question with a simple canvas. For example, what is your favourite food with an outline of a plate. Kids can then use their fingers or iPad Pen to draw in while talking into the ipad. It's also fun for parents to participate.
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