Understand your health without sacrificing your privacy.

SympLog is a privacy-focused health diary and symptom tracker that helps you log your lifestyle — from symptoms, vitals and mood to sleep, nutrition, medications and more. Discover patterns in your health, view correlations, and keep a clear timeline for doctor visits, all with the confidence that your data stays 100% on your device.

🔒 PRIVATE & SECURE BY DESIGN

Your health data belongs to you alone.

• No account needed – Start tracking immediately. No sign-ups, no emails, no passwords.

• Local encrypted storage – All data is encrypted and stored locally on your device. We do not track you or store your data in the cloud.

• Advanced security – Protect your diary with biometric lock (fingerprint/face), PIN, or rely on your device’s lock screen.

📘 WHAT YOU CAN TRACK

• Symptom tracker – Log symptoms in seconds with severity ratings and notes. Create your own symptoms to track exactly what matters to you.

• Vitals tracker – Record weight, blood pressure, heart rate, body temperature, blood glucose, steps, water intake and dozens more. Supports single values, durations and composite measurements. Create your own vitals to track what matters most.

• Medication manager – Define your medications and manage intake with a simple calendar view. Mark doses as taken and use schedules that auto-fill dates.

• Mood & sleep journal – Record your daily emotional state and track sleep duration and quality. See how rest patterns affect your overall well-being.

• Comprehensive lifestyle logging – Track nutrition, activities, life events and personal notes alongside your health data so everything stays in one place.

📈 INSIGHTS & TRENDS

• Visualize your health over days, weeks and months.

• Compare different factors to explore correlations, such as how sleep quality impacts mood or how specific activities or foods relate to symptom flares or relief.

• Use clear timelines and charts to prepare for doctor and therapist visits.

🛠️ POWERFUL TOOLS

• Export data – Create encrypted, password-protected backups to move your data safely to another device.

• Fast entry – Designed for daily use with a quick, frictionless interface.

• Multi-language – Available in English, German, French, Spanish and Portuguese.

• Daily reminders – Create multiple reminders with your own text and get notified at your preferred times.

• Dark mode – Fully supported for comfortable night-time logging.

🇨🇭 MADE IN SWITZERLAND

Built by BitByBit.ch with years of experience in privacy-respecting, security-sensitive software — and a passion for high-quality tools that keep you in control of your data.

⚠️ DISCLAIMER

SympLog is a personal lifestyle and wellness tracker. It is not a medical device and does not provide medical or clinical advice, diagnosis or treatment. Nothing in the app should be used as a substitute for the judgment of a qualified healthcare professional. Always talk to your doctor or other licensed clinician about your health, symptoms and medications.