100% Local • Data Never Leaves Your Mac

Pure Billings Method
Tracker for Mac

No thermometer. No cloud. Just you and your chart.
AI that helps you learn, never overrides.

Reserve Beta Access - £29/year

Launching April 2026 • First 100 users lock in £29/year forever

Pure Billings Method

One biomarker. No devices. Follows what you learned in class; no algorithms second-guessing you.

Actually Private

Your data physically cannot leave your Mac. No cloud. No tracking. Privacy by architecture.

AI That Helps You Learn

Local AI recognises your patterns and helps you understand them but never overrides the method.

Why Billings? Why Local-First?

Simple. One biomarker. No devices required.

The Billings Method:

  • One biomarker: cervical mucus
  • No thermometer (save £20-100)
  • Works with irregular schedules
  • 98-99% effective when practiced correctly

Local-first means:

  • Data physically can't leave your Mac
  • No cloud servers to breach
  • Works completely offline
  • No trust required; privacy by design

Simple Pricing

Try free. Or lock in beta pricing before launch.

Try It Free

£0

Forever

Basic charting when app launches

BEST VALUE

Practitioner

£29

/year • First 100 users only

Reserve Beta Access

AI insights + instructor exports

Couple

£59

/year

Reserve Access

Everything + partner features

Full refund available anytime before launch (April 2026)

Master the Billings Method with privacy you can trust

Launching April 2026 • Limited to 100 beta users

Reserve Your Spot - £29/year