Velle: Period & Cycle Tracker

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In-app purchases

About this app

Velle is a period tracker and ovulation calculator that works 100% offline. Track your menstrual cycle, predict fertile days, log symptoms, and learn what your body actually does. No account, no cloud, no ads. Your data never leaves your device.

Four modes that adapt to your life:
▸ Track my cycle (period and symptom logging)
▸ Conceive (trying to get pregnant)
▸ Prevent (natural contraception)
▸ Perimenopause (changing cycles and new symptoms)
Switch anytime. The dashboard, insights, and notifications change to match your goal.

🔮 OVULATION CALCULATOR & FERTILITY TRACKER
Predict your ovulation date and fertile window from your cycle history. In Conceive mode, see daily conception probability, days past ovulation (DPO), and a colour-coded fertility bar.
▸ Ovulation day and fertile window predictions
▸ Daily fertility status: Peak, High, Low, TWW, or Late
▸ Basal body temperature (BBT) and cervical mucus logging
▸ Intercourse tracking with conception-focused insights
▸ Smart notifications for fertile window, ovulation, and test day
▸ Phase-aware conception advice with diet and lifestyle tips (Pro)

📅 PERIOD & MENSTRUAL CYCLE TRACKING
Log flow, pain, mood, energy, cervical mucus, and notes in seconds. Edit any past day.
▸ Cycle calendar with phase visualisation (menstrual, follicular, ovulatory, luteal)
▸ Predictions that adjust as your history grows
▸ Cycle and period length learned from your logs — nothing to guess at setup
▸ Works with irregular periods and long cycles
▸ PCOS mode with extended prediction windows (Pro)
▸ Teen mode with educational content for under-18 users

🔍 PATTERNS YOU CAN ACTUALLY SEE
After a few cycles, Velle surfaces what recurs in your data. "You often feel irritable 3 days before your period (4 of last 6 cycles)." Just what your logs show. Free for every mode.

🌗 PERIMENOPAUSE MODE
For when cycles get less predictable. The dashboard reframes around variability and adds logging for hot flushes, night sweats, sleep, and brain fog.
▸ 30-day symptom tally on the dashboard
▸ "This cycle is X days longer than your average" framing
▸ "It's been a while" path for late transition
▸ Tracks symptoms even when periods stop
🛡️ PREVENT MODE (NATURAL CONTRACEPTION)
Colour-coded signal: green for lower risk, amber for caution, red for unsafe days.
▸ Safe and unsafe day predictions with safety margins
▸ Optional Protected toggle on intercourse logging
▸ 3-cycle trial included, then Pro
🔒 PRIVATE BY DESIGN
Most period tracker apps send data to corporate servers. Velle never has it.
▸ Zero-knowledge architecture. Data encrypted on-device with SQLCipher
▸ App lock with custom PIN. No email, no sign-up, no identifiers
▸ No ads, no analytics, no third-party trackers
▸ Discreet notifications. You write the reminder text
▸ Import from Clue, Apple Health, or CSV. Export anytime
💎 VELLE PRO
▸ Burner PIN: wipe all data instantly
▸ Stealth Mode: disguise icon as Calculator, Notepad, or Utility
▸ Encrypted Google Drive backup with 12-word recovery phrase
▸ 12 months of predicted periods and fertile windows
▸ Trend charts for mood, energy, flow, and pain
▸ Conception advice and traffic-light calendar
▸ PCOS and irregular cycle modes
▸ PDF reports for your doctor
✦ WHY PEOPLE SWITCH TO VELLE
→ Ovulation calculator and period tracker that shares nothing
→ Four modes that adapt as your body changes
→ No paywall on cycle predictions or ovulation tracking
→ Pattern detection free for every user
→ Clean, gender-neutral design
→ Stealth mode, burner PIN, zero-knowledge encryption
→ Import from Clue or Apple Health in one tap
Disclaimer: Velle is not a medical device or certified contraceptive method. Ovulation predictions use the calendar method. Prevent mode uses fertility awareness with safety margins but is not 100% reliable. Information is for personal tracking only and does not replace medical advice.

What’s new

🚀 Velle 1.2 is officially live! Your privacy-first period tracker.

• Goal-driven tracking (Cycle, Body, Conceive, Prevent).
• Frictionless daily logging for symptoms and mood.
• 100% offline with secure on-device encryption.
• Velle Pro: Unlock Stealth Mode, Burner PIN, encrypted sync, and PDF exports.

Take back control of your health data today!