# Chitti

> Chitti is a learning app for children in India: video courses in science, technology and more — many taught in Tamil — plus short science and maker videos ("shorts") and weekly hands-on build projects. Free lessons can be watched on this website; the full experience (progress, quizzes, rewards, build submissions) is in the Chitti app for Android and iOS.

Every link below is a public web page. Lessons and shorts are videos: their pages carry the title, a written summary and the video player, and anyone can watch them without an account. Lesson URLs are a single slug after the domain (/<slug>); courses live under /course/, shorts under /shorts/ and builds under /builds/. A title or summary that says "in Tamil" means the video is taught in Tamil.

## Main pages

- [Home](https://one.chitti.app/): featured courses, shorts and the build of the week
- [All courses](https://one.chitti.app/courses): the full course catalog, by grade and language
- [Shorts](https://one.chitti.app/shorts): quick science and maker videos
- [Builds](https://one.chitti.app/builds): weekly hands-on build projects
- [Get the app](https://one.chitti.app/get-app): Google Play and App Store links

## Courses

- [Science Foundation](https://one.chitti.app/course/science-foundation): Science for kids in Tamil introduces key concepts through hands-on home experiments. Children explore density and submarines, DIY thermometers, total internal reflection, static electricity, holograms, and DIY CO2 fire extinguishers.
- [Scratch Junior](https://one.chitti.app/course/scratch-junior-tamil): Scratch Junior coding for kids teaches visual programming in Tamil. Learners design sprites, animate stories with motion and sound blocks, record dialogues, and code interactive games with touch controls and mazes.
- [ROBOTIC SIMULATION](https://one.chitti.app/course/robotic-simulation): Robotics simulation in Tamil introduces kids to virtual robot coding using VEX VR. Learners explore block programming, distance and bumper sensors, art canvas drawing, dynamic wall maze solving, and magnet disk movers.
- [3D Printing](https://one.chitti.app/course/3-d-printing): 3D printing for kids, taught in Tamil, covers the complete maker workflow. Students explore printer parts, design in Tinkercad, slice models in PrusaSlicer, level the bed, and master post-processing like sanding and painting.
- [A.I. with Teachable Machine](https://one.chitti.app/course/ai-with-teachable-machine-tamil): Artificial intelligence and machine learning with Teachable Machine for kids is taught in Tamil. Learners train image, voice, and pose recognition models, code projects in Scratch, and deploy AI models to HTML websites.
- [Maths Junior](https://one.chitti.app/course/maths-junior): Junior maths for kids in Tamil teaches foundational concepts in numbers, shapes, and measurements. Lessons cover equivalent fractions, 2D and 3D shapes, reading analog clocks, lattice multiplication, and units of volume.
- [Science Junior](https://one.chitti.app/course/science-junior): Science for kids in Tamil introduces foundational science through guided lessons and stories. Lessons explore flower parts, soil types, inner and outer planets, the water cycle, food preservation, and kitchen safety.
- [Physics](https://one.chitti.app/course/physics-tamil): Physics for students is taught in Tamil to explain everyday science concepts. Lessons cover Newton's laws of motion, speed and velocity, electric current, vernier caliper and screw gauge measurements, and heat energy.
- [Luno Bruno](https://one.chitti.app/course/luno-bruno-tamil): Science for kids is taught in Tamil through an adventure story with Luno and Bruno. Learners explore repeating patterns, saving money using Indian rupee coins and notes, and why different objects roll, slide, or do both.
- [Chemistry](https://one.chitti.app/course/chemistry-chemistry): Chemistry lessons in Tamil for students cover key curriculum topics across environmental chemistry and pollution, distillation and chromatography techniques, chemical kinetics, atomic structure, and periodic trends like electronegativity.
- [Maths](https://one.chitti.app/course/maths-tamil): Maths for students, taught in Tamil, strengthens problem-solving across school curriculum concepts. Lessons cover integers and rational numbers, algebra, trigonometry, matrices, and probability distributions.
- [CWC](https://one.chitti.app/course/cwc-cwc): Science experiments for kids taught in Tamil explore practical physics and chemistry principles through hands-on activities. Lessons cover light refraction, atmospheric pressure, homemade snow, elephant toothpaste, and tea bag rockets.
- [Boo](https://one.chitti.app/course/boo-boo): Science for kids in Tamil introduces basic concepts through guided lessons alongside companion Boo. Children explore volume and three-dimensional space, drawing using shapes, and the life cycle of a butterfly from egg to adult.
- [Biology](https://one.chitti.app/course/biology-biology): Biology for students in Tamil covers core life science concepts across school topics. Lessons explain cell structure, DNA replication, plant tissues, microorganism uses and diseases, and biological classification systems.

## Optional

- [Full index](https://one.chitti.app/llms-full.txt): every lesson, short and build, each with a summary of what it teaches
- [Sitemap](https://one.chitti.app/sitemap.xml)