Stim Check is a lightweight utility that helps you monitor and manage caffeine intake by estimating how much stimulant remains active in your body at any moment. Stim Check begins with a simple log of common sources—coffee, pre-workout, and energy drinks—and computes a real-time caffeine curve using your body weight and a configurable half-life model so you can make informed choices about training sessions, night shifts, or bedtime. The app emphasizes fast, unobtrusive interaction: add a drink in seconds, view an updated curve, and see a clear-by time for when levels fall beneath a sleep-safe threshold.
The main dashboard in Stim Check presents an interactive curve that projects caffeine concentration throughout the day, allowing you to pan and tap to inspect any timestamp. Logging controls are optimized for rapid entry: choose a beverage type, select a portion size or custom milligrams, and hit add—no long forms or multiple screens. The app stores a compact history of recent entries so you can review doses by day and export a simple text summary for personal tracking. Calculations use body weight and an adjustable half-life parameter so the estimate adapts to different metabolisms or research-based values you prefer to apply.
Controls are intentionally simple and designed for one-handed use. Tap the floating add button to open a condensed entry card, use presets for common drinks, or enter a custom caffeine amount when you know the milligram value. The timeline supports pinch-to-zoom and swipe gestures to navigate days, and each logged item can be edited or deleted with a single press. For people who prefer minimal interaction, the quick-add templates let you record multiple beverages in rapid succession without interrupting your routine.
Stim Check helps you build awareness over time with daily and weekly summaries that highlight total intake, peak times, and average clear-by moments. Rather than a gamified leaderboard, progression is presented as personal insight: streaks of days under a self-set caffeine goal, trend lines that show whether your evening intake is changing, and optional reminders to log doses. These habit-focused features encourage steady improvement in sleep hygiene and performance timing while remaining fully local to your device unless you choose to export data.
The visual design uses a clear contrast curve, legible typography, and color cues to indicate safe, cautionary, and high-stimulant ranges. Graphs are uncluttered so important thresholds stand out at a glance, and themes include a high-contrast option for readability. Accessibility considerations include scalable text sizes, descriptive labels for graph elements, and touch targets sized for reliable use on smaller screens. The interface remains simple for new users while providing deeper metrics for anyone who wants to explore their patterns in more detail.
Stim Check works completely offline for logging, graphing, and viewing history; no account or online connection is required to use the core features. Data is stored locally on the device and can be erased or exported by the user. Because the app focuses on individual estimates and habit tracking, all computations and visualizations run directly on your phone to minimize data exposure and preserve privacy.
The app’s replay value comes from continual monitoring and the feedback loop of logging, reviewing, and adjusting behavior. Small challenges like reducing evening intake, reaching personalized daily targets, or maintaining a streak of sleep-safe evenings provide measurable goals without competitive pressure. Over weeks, the combination of visual trend reports and adjustable half-life settings helps users iteratively refine timing for workouts, shifts, and sleep.
While Stim Check offers personalized estimates based on weight and half-life, calculations are approximate and intended for informational use only; they do not replace professional medical advice. The app currently focuses on common caffeine sources and may not list every specialty product, but custom milligram entries allow you to include unusual items. As Stim Check is under continuous development, you may notice periodic updates and interface refinements during the public beta phase.
