Reflect - an app to track anything and analyze your data, including a feature to run self-guided experiments [0]
Later - an app to schedule non-urgent tasks and ideas, with an SRS-like scheduler to punt items [1]
[0] https://apps.apple.com/us/app/reflect-track-anything/id64638...
[1] https://apps.apple.com/us/app/later-set-intentions/id6742691...