Know your body, on your terms.

Lodestar is an iPhone app that turns your Fitbit data into clear daily scores for sleep, recovery, effort and stress, and shows exactly how each one was worked out.

Shows its working

Tap “Why This Number?” on any score to see each input and the maths behind it.

Private by design

Your data goes from Google Health straight to your phone and is processed there. We run no servers that store or process it.

Plans tonight for you

Sleep need, sleep debt and a bed-by time, naps included.

Notices when you’re under strain

Breathing, temperature and heart signals compared with your own usual, overnight.

How it works

You sign in with Google and give Lodestar read-only access to your Fitbit data in Google Health: activity, heart and health measurements, sleep, and your profile age. Lodestar downloads that data to your iPhone and calculates every score on the device. Optional AI-written insights are produced by Apple’s on-device model. Nothing is sent to us.

Not medical advice

Lodestar is for general wellness and information only. It is not a medical device and does not diagnose, treat, cure or prevent any condition. Talk to a qualified health professional about any medical concern.

Contact

Questions, ideas or feedback: lodestar.will@gmail.com