Free Tools
30+ Free Tools
Genetics, pregnancy, fertility, and baby development tools - completely free, no account required.
Genetic Predictors
Eye Color Predictor
Predict baby's eye color using the two-gene inheritance model. Input parent and grandparent eye colors for accurate probability calculations.
Hair Color Predictor
Calculate probable hair color outcomes based on melanin genetics and family inheritance patterns.
Hair Type Predictor
Predict curly, wavy, or straight hair using dominant/recessive gene analysis.
Blood Type Calculator
Determine possible blood types using ABO and Rh factor inheritance rules.
Height Estimator
Calculate predicted height range using mid-parental formula and genetic variance.
Pregnancy Health
Due Date Calculator
Calculate your estimated due date based on last period or conception date.
Pregnancy Weight Gain Calculator
Personalized weight gain recommendations based on your BMI and pregnancy stage.
BMI Calculator
Calculate your pre-pregnancy Body Mass Index.
Fertility & Conception
Ovulation Calculator
Predict your most fertile days.
Fertility Window Tracker
Identify your best days to conceive.
Cycle Length Calculator
Track and analyze your menstrual cycles.
Free Tools FAQ
Common questions about our free tools
Yes! All tools are completely free, no credits required, no subscription needed. Only AI baby photo predictions require credits.
Never. We're committed to keeping basic pregnancy and genetics tools free forever.
No account and no sign-up — every tool on this page runs free in your browser. To save your results, track them over time, and get the full experience, download the ProbaBaby app from the App Store.
Yes! Most tools work offline. Only AI predictions requiring processing need internet.
Free tools use standard calculations. AI predictions use Google Gemini AI and image generation, which cost us per prediction.
Yes. They use established genetic models like the two-gene model for eye color and Mendelian inheritance for blood type. However, these are simplified models.
Access All Free Tools in the App
Download ProbaBaby to use all 30+ tools - no account or credits required.
- Free to download
- No subscription
- 30+ free tools