Everyday tools
Put numbers on life’s trade-offs
Simple, transparent math for the decisions that are usually argued by feel: focus and interruptions, moving, retraining, and what your subscriptions really cost.
Plain formulas you can inspect — no AI scoring, no hidden weighting. Inputs stay in your browser.
Focus & mental energy
How much your day really costs in attention: interruptions, task switching, decision fatigue, and how long your focus actually lasts.
Signal-to-Noise · Content Throughput
Measure how much of your daily information intake converts into actionable decisions. Throughput-pipe visual with clogged / flowing state.
Task Switching Tax · Context Overhead
Calculate the hours per day you lose to juggling concurrent projects. Each additional context costs 20% of remaining capacity — CPU-usage view.
Decision Fatigue · Willpower Battery
Model remaining willpower across the day. Every decision draws from the same finite reserve — trivial × 1, moderate × 5, heavy × 10.
Deep Work Capacity · Focus Horizon
Exponential decay model of focus quality. e^(−0.01×min) half-life ≈ 69 minutes — the horizon shows how long until quality drops below usable.
Life logistics
The bigger structural questions, math-first: when moving pays off, whether retraining is worth it, which subscriptions to cut, and which commitments give back.
Geographic Arbitrage · Migration Horizon
Calculate the break-even month for a move. Monthly gain = (income − cost) at destination minus origin. Horizon visual with plane marker.
Upskill ROI · Investment Recovery
Calculate the true payback window on a course or bootcamp, including opportunity cost of study hours. Recovery progress bar with 24-month reference.
Subscription Purge · Leak Detection
List every recurring subscription, see the monthly bleed and the 10-year lifetime cost. Sinking-ship visual with drip animations. Pipes recovery into Runway Zero.
Social Utility · Balance of Connection
Weigh support and positive energy against conflict and drain. Balance-scale visual with tilt indicator. Signals pattern, not judgement.
Logic topics
Guides that connect the tools in this suite — how the numbers interact and when to stack them.