CycleSync

CycleSync is a free Chrome extension that brings menstrual cycle tracking directly to your browser. No app, no account, no data sharing. Why CycleSync? Most cycle tracking apps are complicated, require sign-up, and sell your health data. CycleSync was built differently — everything is stored on your device, no account needed, no data shared with anyone. What CycleSync does: 🌸 Daily cycle phase — Always know which phase you're in. Menstrual, Follicular, Ovulation or Luteal — visible at a glance. 📅 Period countdown — See how many days until your next period directly in the dashboard. 🩸 One-tap period logging — Log the start of your period instantly with a single button. 🔮 Ovulation prediction — Know your fertile window and ovulation date automatically. 📝 Symptom logging — Track flow, mood, energy, cramps and more daily. 💡 Phase tips — Personalised advice on nutrition, exercise and wellbeing based on your current phase. 🔄 Cross-device sync — Your cycle data syncs automatically across all your Chrome devices. No account needed. 📐 Customisable size — Choose between small, medium or large popup window in settings. 📅 Calendar export — Export your predictions to Google Calendar, Apple Calendar or Outlook via .ics file. 🌍 14 languages — Available in English, Arabic, Spanish, Portuguese, French, German, Russian, Japanese, Chinese and more. 🔒 100% private — No account, no server, no data sharing. Everything stays on your device. CycleSync is free forever. If you find it useful, you can optionally support development via Ko-fi. --- Version 1.0.1 This update focuses on stability and cross-platform compatibility improvements to ensure a consistent experience for all users. Resolved layout issues affecting Windows users Improved font rendering and text display across all operating systems Enhanced popup sizing to prevent content from being clipped Optimised scrollbar behaviour for a cleaner interface Minor visual refinements across the calendar, dashboard, and settings views We appreciate your support and feedback as we continue to improve CycleSync. --- Version 1.0.2 This update introduces a first-time setup experience to help new users get personalised cycle tracking right away. Added onboarding flow for new installs — enter your last period date and cycle length to see accurate phase and prediction data from the start Fixed an issue where the dashboard showed placeholder data instead of your actual cycle information Improved first-run experience across all supported platforms We are listening to our users ☺️🙏🏿 --- Version 1.0.3 Further layout and rendering improvements for Windows users. We are listening to our users ☺️🙏🏿 ---- Version 1.0.4 ✅ Onboarding flow (with cycle length + period length steps) ✅ Period countdown bar ✅ Period started button ✅ Symptom date defaults to today ✅ Uninstall feedback form (moved to background.js) ✅ manifest.json warning fixed We are listening to our users ☺️🙏🏿 ---- What's New in v1.0.5 We've been listening! This update focuses on making CycleSync even better based on early user feedback. ✨ Review Prompt : After using CycleSync for a few days, you'll see a gentle nudge to leave a review. Your feedback helps us improve and helps other women discover the extension. 🐛 Bug Fixes & Stability : General improvements to make the experience smoother across all devices and operating systems. ---- What's New in v1.0.6 ☕ Support CycleSync — CycleSync is free and always will be. If it's been helpful to you, you can now support the project with a small coffee via Ko-fi. You'll find the support button in the Settings tab, and after a week of tracking we'll give you a gentle nudge too. No pressure — every coffee genuinely helps keep development going. 🐛 Bug Fixes & Stability — Further improvements to make the experience smoother across all devices. --- What's New in v1.0.7 🔄 Cross-Device Sync — Your cycle data now follows you everywhere. Install CycleSync on any device where you use Chrome and your data syncs automatically. No account needed — existing users are migrated automatically with no data loss. 📐 Customisable Popup Size — You asked, we listened! You can now choose Small, Medium or Large popup size from the Settings tab to suit your screen and preference. 🗓️ Google Calendar & Trello — These integrations are coming in a future update. We've updated the Settings tab to make this clearer so there's no confusion. 🐛 Bug fixes and stability improvements --- What's New in v1.0.8 🌍 Russian Language Support — CycleSync now supports English and Russian. Switch languages instantly from the Settings tab. All phases, symptoms, tips and onboarding are fully translated. Большое спасибо Стасу за вдохновение! (Thank you to Stas for the inspiration!) 🇷🇺 Language Switcher — Find the new Language section at the top of Settings. Switch between 🇬🇧 English and 🇷🇺 Русский with one tap. Your preference is saved automatically. 🐛 Bug fixes and stability improvements ---- What's New in v1.0.9 🇪🇸 Spanish Language Support — CycleSync now speaks Spanish! Full UI translation including all phases, symptoms, tips and onboarding. Perfect for our growing community in Spain and Latin America. 🇧🇷 Portuguese Language Support — Full Brazilian Portuguese translation now available. Bem-vinda! For our users in Brazil and Portugal. 📅 Export to Calendar — You can now export your predicted period dates, fertile window and ovulation to any calendar app. Go to Settings → Data Management → Export to Calendar (.ics) and import into Google Calendar, Apple Calendar or Outlook. 6 months of predictions generated automatically. 🐛 Theme Fix — Fixed an issue where the selected theme wasn't being saved between sessions. Your chosen theme now persists every time you open CycleSync. CycleSync now supports 4 languages: 🇬🇧 English · 🇷🇺 Russian · 🇪🇸 Spanish · 🇧🇷 Portuguese Switch languages anytime from the Settings tab. --- What's New in v1.1.0 🌍 13 Languages — Now Truly Global Cyc…