Free baby growth percentile calculator using WHO and CDC charts for children 0–5 years
Voice-first symptom and health tracker for chronic illness
Stage
Not given
MVP
Founded
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Based in
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Pricing model
Free
Freemium
Pricing
Not given
Free: $0, includes voice and slider logging, daily trends, symptom heatmap, device sync, data export, and daily reminders. Pro: $5.99/month or $39/year (approximately $3.25 per month billed yearly), adds doctor-ready PDF reports, deep pattern insights across food, activity and weather, smarter Ask f
Key features
WHO Child Growth Standards charts for ages 0–60 months
CDC 2000 growth charts available from age 24 months
Weight, length/height, head circumference, and weight-for-length measurements
Separate growth curves for boys and girls
Corrected age calculation for premature babies born before 37 weeks
Private browser-only growth log with no server upload
Trend alert for faltering growth based on UK NICE guidance
Gain-per-day check between measurements
Works offline after initial page load
Voice-first symptom logging
0-10 symptom sliders
Food and medication tracking
Trend charts and pattern insights
Cross-device sync
Data export in JSON and CSV
Crash and flare day flags
Custom symptom fields
Ask feature for natural language queries
Doctor Prep tool for appointment summaries
What makes it different
No ads, no account, no data collection—measurements never leave your browser
Official WHO LMS parameters and CDC data with published formulas shown explicitly
Handles measurement precision automatically with date-of-birth mode for young babies
Applies WHO's 0.7 cm adjustment for lying vs standing measurement method at 24 months
Cross-checked data with automated test suite validating WHO medians and clinical thresholds
Voice-first approach reduces logging friction for people with chronic illness
Built specifically for ME/CFS, Long COVID, fibromyalgia, and POTS with condition-appropriate metrics
Plain-English pattern insights from user data
Free forever with no data selling or advertising
Progressive Web App works on any device without app store installation
BabyPercentile