LagProof

LagProof is a mobile + web habit tracker that focuses on time-lagged results: the reality that workouts, sleep, studying, and diet often pay off days or weeks later. Instead of rewarding daily checkmarks, it helps users model “when this habit actually shows up” using simple lag windows (e.g., hydration impacts energy in 0–1 days; strength training impacts mood in 1–3 days; weight change in 7–21 days). Users log habits quickly, then the app visualizes correlations with outcomes they care about (mood, focus, weight, resting heart rate) using rolling windows and seasonality-aware charts. It’s brutally pragmatic: it will tell you when your data is too noisy, when you’re not logging enough, and when a habit likely isn’t moving the needle. The core value is reducing false conclusions (“this isn’t working”) and helping users stick with habits long enough to see real effects.