CardioEngine vs Open Feelings

CardioEngine builds your heart rate zones from your aerobic threshold, not your age. Most cardio apps tell you to "aim for 60–70% of max HR." That number is derived from your age and tells you almost nothing. Your aerobic threshold is the actual boundary between fat-burning aerobic work and glycolytic effort. CardioEngine finds yours and builds five zones around it. ZONE-BASED LIVE COACHING Once your workout starts, CardioEngine watches your heart rate and tells you when you drift out of your target zone. Too high? Ease off. Too low? Push a little. No guessing, no manual math. WORKS WITH YOUR HR MONITOR Connect your Polar, Garmin, Wahoo, or any Bluetooth chest strap. Pair your Apple Watch. CardioEngine reads from whichever source is most reliable — if your watch drops out mid-run, it switches to your chest strap without missing a beat. YOUR WEEKLY TRAINING PICTURE Set a weekly cardio volume target. CardioEngine totals your zone 2 minutes across every session and shows how far you are from your goal. The dashboard marks each training day so you know exactly where you stand heading into the weekend. ZONE PROFILE BUILT FOR YOU Your five zones are calibrated from your estimated aerobic and lactate thresholds, not a population average. Your zones update as your fitness changes. A confidence score tells you how solid the estimate is — low score just means you need more workout data. FASTED CARDIO Fasting raises your heart rate at any given effort level. CardioEngine accounts for this by shifting your zone ceilings down a few beats, so your targets stay meaningful when you're training before breakfast. WHY ZONE 2 Zone 2 is where mitochondrial adaptations happen. Maffetone and Attia have both written on why most people train too hard and get too little from it. CardioEngine keeps you in that range. • Live zone coaching during workouts • Bluetooth HR monitor + Apple Watch support with automatic failover • Personalized zone profile from your aerobic threshold • Weekly volume tracking with session history • Fasted cardio mode • Treadmill, stationary bike, recumbent bike, rower, stair stepper, and elliptical • watchOS companion app

Some days you can name exactly what you feel. Most days you can't. Open Feelings is a quiet, private space to slow down, look inward, and find the right word — one gentle check-in at a time. At the center is a feelings wheel adapted from the Open Emotion Wheel: start with a broad feeling, then move inward toward something more precise — or stop wherever feels true. Prefer a softer path? A guided three-step check-in walks you there without the full wheel. Selected feelings come with clear, plain-language definitions so naming an emotion also helps you understand it. A LITTLE EACH DAY - Pick a feeling from the wheel, or follow the gentle 3-step wizard - Add only what you want: intensity, a body map, sensations, triggers, coping ideas, a mood scale, or a short note - Edit any past check-in whenever you want - Set one daily intention and look back on it later - Keep a quiet streak going — no pressure, no badges to chase SEE YOUR PATTERNS - Insights by week, month, and year: trends, streaks, top feelings, by-day rhythms - Notice where feelings land in your body and which coping ideas pair with which triggers GO DEEPER WHEN YOU WANT TO - Sort what matters to you with a swipe-based values exercise, then commit to small actions - Work through a thought with a CBT-style thought record — name the thinking pattern, then find a more balanced view - Create a tidy summary PDF to bring to a therapy session, or export everything as CSV, JSON, Markdown, or text - Hand a single check-in to Apple Journal, Day One, or Notes YOURS, AND ONLY YOURS - No accounts. No ads. No analytics. No trackers. No third-party SDKs. - Your check-ins live on your device and sync only through your own private iCloud — there's no server we control, and we never see your data - iCloud sync follows your Apple ID settings and keeps your own devices in step - Optional Apple Watch check-ins, a daily reminder, and write-only Apple Health "State of Mind" - Free, with an optional tip jar that simply says thanks — it unlocks nothing Open Feelings is open source (MIT licensed). Open Feelings is an educational and reflective tool, not a substitute for professional care, diagnosis, or treatment. If you are in crisis, please contact local emergency services or a crisis line.