The best alternatives to Questr are Google Play Music, Iris., and Bucketlistly. If these 3 options don't work for you, we've listed a few more alternatives below.
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Iris is a combination of task manager and mind-map for more flexible and convenient achievement of your goals. It allows you to constantly visualize the whole picture of your goals, tasks, and ideas.
Buckitron is a marketplace for your bucket list, where Guests can list their bucket list, pay to live the experience and track their progress; all in one place while Hosts can earn money by offering these bucket list experiences to guests.