Your Life, Quantified.
Unlock the hidden correlations between your habits, caffeine intake, and performance. Delta Calendar isn't just a planner—it's a personal analytics engine.
Android version in development
Beyond the Checkbox
Standard habit trackers just tell you what you did.
Delta tells you how it affected you.
Correlation Engine
Does rain kill your productivity? Does a morning run improve your chess rating? Delta visualizes the connections between your events and your metrics.
Pharmacokinetics
Track caffeine and supplements with medical-grade precision. We calculate half-lives to show you exactly how much remains in your system at bedtime.
Smart Integrations
Connect with Apple Health to auto-import sleep and steps, or link your Chess.com account to correlate cognitive performance with daily habits.
Ready to upgrade your day?
Join thousands of users optimizing their lives with data.