Anatomy that answers back.
Tap any structure to learn its name, function, and clinical relevance. Then test yourself with timed labeling quizzes — built around how students actually study.
👋 New here? No signup needed — your scores save locally and sync when you create an account.
- 1🎯 Take the quiz
See what you know
- 2👆 Tap to learn
Fill the gaps in Study
- 3⚡ Drill timed
Lock it in with Practice
- 8
- regions
- 200+
- bones
- 5
- study modes
Pop quiz time!
I'll show you a bone — you name it. Easy 60 seconds.
— Ossie · tap me for more
Color-coded regions · the visual index
same colors used everywhere in the appChapter I · Bone trivia
Did you know? 🦴
Femur
Longest & strongest bone — can support 30× body weight.
Stapes
Smallest bone in the body — only ~3 mm long.
Babies
Born with ~270 bones; adults have 206 (they fuse!).
Marrow
Makes ~2 million red blood cells every single second.
Built for how students study
Static diagrams are passive. Osseo turns every structure into something you interact with — color-coded, quizzable, and reviewed.
Tap-to-learn
Click any bone for name, function, and high-yield clinical pearls.
Timed quiz mode
Active-recall labeling drills — the proven way to memorize fast.
Replaceable diagrams
Drop in professionally reviewed illustrations as your atlas grows.
Progress tracking
Sync mastered structures and quiz scores across every device.
Clinical relevance
Each entry includes the high-yield exam-style notes you actually need.
Mistake review
Missed a bone? It loops back into tomorrow's quiz automatically.
Bones aren't just bones ✨
Five jobs your skeleton handles every second of every day.
Protect
Skull guards the brain; ribs shield heart & lungs.
Support
The vertebral column holds you upright.
Move
Bones act as levers for every muscle pull.
Produce
Marrow makes red & white blood cells.
Store
99% of your body's calcium lives in bone.
Ready to make anatomy stick?
Start with a 60-second quiz. No signup. Your progress saves locally.
Free forever for the basics. Osseo Pro is $4.99/month (or $39.99/year) and unlocks all 206 bones — first 7 days free.