CaffeineX vs Cutoff

CaffeineX helps you understand how coffee, tea, energy drinks, and espresso may affect the rest of your day. Instead of only counting cups, CaffeineX estimates your current caffeine level, shows a clear 24-hour curve, and gives a simple sleep reference so you can decide whether another drink still makes sense. What you can do with CaffeineX: - Log common caffeinated drinks quickly - Estimate remaining caffeine based on your entries - See when your level may move closer to your sleep reference - Check today's total intake and personal limit - Review recent caffeine patterns over time - Add custom drinks when presets are not enough - Sync caffeine intake with Apple Health if you choose - Use widgets for a quick glance at your status CaffeineX is built for people who like coffee but do not want caffeine to quietly take over their evening. It keeps the interface calm, focused, and easy to read, so the answer is visible fast: how much caffeine is likely still active, whether it may affect sleep, and when it may be better to pause. Caffeine estimates are for everyday wellness reference only and are not medical advice.

Cutoff shows how much caffeine is actually in your body right now, and estimates your wind-down window — the range of times it typically drops below the level that starts affecting sleep. A range, not a single time. Caffeine's half-life varies from about 2 to 10 hours between people, so a confident "you're clear at 9:47 PM" is false precision. Cutoff shows an honest window instead, and you can tune it to match what you actually notice. WHAT MAKES CUTOFF DIFFERENT • One tap to log. Coffee, espresso, cold brew, tea, energy drinks, or a custom amount. • A live curve. Watch caffeine rise and fall through your day, modelled the way pharmacology actually does it — absorbed over an hour, then cleared at a steady rate. • Two honest answers. Most apps show one confident cutoff time. Cutoff shows both its own estimate and what sleep research suggests — which often points earlier — and lets you see where they disagree, rather than pretending they agree. • A screen that reads your state. The background warms as your caffeine climbs toward your daily limit, so you can tell where you stand at a glance. • Trends that build over time. A 13-week intake heatmap, your typical day, and when you usually have your first cup. • Sleep, side by side. Connect Apple Health to see your sleep next to your caffeine. If you use Oura or Whoop, their sleep flows into Apple Health too. Shown honestly — not as cause and effect. PRIVATE BY DESIGN Everything stays on your device. No account, no sign-in, no server, no analytics, no ads. Cutoff has no networking code at all — it cannot send your data anywhere. Export your log as a CSV or delete everything, any time. Cutoff is for general information and self-awareness. It doesn't diagnose, treat, or prevent anything, and it can't tell you how you'll sleep — caffeine is one of many things that affect that.