One change at a time.
For any question, bug report, or feedback, email jason.jutla@gmail.com. I read every message.
Change Agent uses your existing Apple Health history to suggest experiments and to compute a baseline for your trials. If you've worn an Apple Watch for less than 14 days, or your Health app has gaps in HRV and sleep data, the app falls back to a short observation period before you can start an experiment.
Calendar access is optional. If granted, the app reads the number of events per day to give context to your experiment results — for example, distinguishing a heavy meeting day from a quiet one. The app never reads event titles, attendees, or any other content.
No. Change Agent stores nothing on external servers and has no account system. Your experiments live only on your device. Your Apple Health data is read in real time and never copied off your phone. Full details are in the privacy policy.
Each experiment runs for fourteen days. The app compares your HRV, sleep, or recovery during the trial against a baseline computed from your prior weeks. The verdict — Working, Likely, or No Effect — reflects whether the change is large enough and consistent enough to be unlikely to be random noise.
Most experiments tolerate occasional misses. The app uses your Apple Watch to detect adherence automatically for trials like sleep and movement, so a missed day is recorded honestly rather than counted as a failure. If you miss too many days, the app will let you know and offer to extend or restart.
Yes. Long-press any experiment in your library to delete it. Deleted experiments are gone permanently.
You can save any habit as a custom experiment from the "New experiment" screen. Describe what you want to do, pick a duration, and the app will track it the same way as the suggested ones.
Delete the app from your home screen. All experiment data is removed automatically. The app does not back up to iCloud.