The best alternatives to BitterWorld are YOU app, Lean Customer Development, and TooDeep. If these 3 options don't work for you, we've listed a few more alternatives below.
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TooDeep is a mobile peer-to-peer support platform, where people can anonymously share their thoughts and feelings through audio recordings and text. TooDeep is currently available for all iOS devices, and will expand to Android devices in late 2020/early 2021.