I got pretty overwhelmed with Notion, Trello, etc. (Even though they are great tools!) as an indie dev, so I built an app that is simpler to use and perfectly suited for an indie like me :) You can basically divide your projects into multiple milestones (a milestone could be e.g. a new version), and the milestones can have multiple tasks that are either todo, in progress, or done. The progress for each milestone is calculated with those tasks, and you can also prioritize and categorize the tasks using tags (E.g. for me, #ph turns into "High Priority", and #pm into "Medium Priority", etc.). Each project also has a backlog for future tasks & ideas, and I'm also currently working on adding markdown-based project notes to describe more complex ideas.
I built this tool for myself (and I'm actively using it), and thought it would benefit others as well.
I'd love to hear feedback and your thoughts! :)