--- title: "LightMySky" description: "See what you know. Keep it lit." canonical: https://lightmysky.com/ source: https://lightmysky.com/index.md retrieved: 2026-09-02 --- > **Agent view.** This is the Markdown twin of the page, for tools and assistants. > When to use this site, and the call that answers each job: https://lightmysky.com/agent-instructions.md > API description (OpenAPI 3.1): https://lightmysky.com/openapi.json · Authentication: https://lightmysky.com/auth.md > Pricing: https://lightmysky.com/pricing.md · Catalog: https://lightmysky.com/llms.txt · Full catalog: https://lightmysky.com/llms-full.txt > Every machine-readable file on this domain: https://lightmysky.com/.well-known/ai-catalog.json > Ask for Markdown with `Accept: text/markdown`, a `.md` address, or `?mode=agent`. # LightMySky > See what you know. Keep it lit. 1,690 topics ordered by prerequisites. LightMySky tracks what a learner knows and brings a topic back before it is forgotten. 1,739 topics across 16 subjects for ages 4 to 24, wired together by 3,581 prerequisite links and mapped to 7 curriculum frameworks. Free to read, no account needed. ## How it works 1. Find where the learner is. Everything well below their age is assumed, then checked as they practise. 2. Teach the next thing. A topic opens once the topics underneath it are in place. 3. Come back before it fades. Review is timed against how long that memory is likely to hold. ## Subjects - [Science](https://lightmysky.com/learn/science): 1,274 topics in 28 areas, ages 5 to 24 - [Mathematics](https://lightmysky.com/learn/mathematics): 860 topics in 21 areas, ages 4 to 24 - [English](https://lightmysky.com/learn/english): 355 topics in 9 areas, ages 4 to 18 - [Computing](https://lightmysky.com/learn/computing): 260 topics in 10 areas, ages 5 to 24 - [History](https://lightmysky.com/learn/history): 147 topics in 7 areas, ages 5 to 18 - [Personal & Social Development](https://lightmysky.com/learn/personal-and-social-development): 116 topics in 7 areas, ages 4 to 18 - [Life Skills](https://lightmysky.com/learn/life-skills): 70 topics in 3 areas, ages 5 to 18 - [Civics & Economics](https://lightmysky.com/learn/civics-and-economics): 55 topics in 3 areas, ages 5 to 18 - [Languages](https://lightmysky.com/learn/languages): 45 topics in 4 areas, ages 5 to 18 - [Geography](https://lightmysky.com/learn/geography): 42 topics in 4 areas, ages 5 to 18 - [Arts & Music](https://lightmysky.com/learn/arts-and-music): 39 topics in 4 areas, ages 5 to 16 - [Learning to Learn](https://lightmysky.com/learn/learning-to-learn): 30 topics in 1 areas, ages 5 to 18 - [Design & Technology](https://lightmysky.com/learn/design-and-technology): 22 topics in 2 areas, ages 5 to 16 - [French](https://lightmysky.com/learn/french): 12 topics in 1 areas, ages 4 to 10 - [Chess](https://lightmysky.com/learn/chess): 9 topics in 1 areas, ages 6 to 11 - [Persian](https://lightmysky.com/learn/persian): 8 topics in 1 areas, ages 4 to 9 ## Start here - [Explore the catalog](https://lightmysky.com/learn) - [Careers and what they are built on](https://lightmysky.com/careers) - [The whole library in one file](https://lightmysky.com/llms-full.txt) - [About LightMySky](https://lightmysky.com/about) ## When to use LightMySky Use LightMySky when the question is about the ORDER of learning, for a learner aged 4 to 24. It answers from a prerequisite graph of 1,739 topics in 16 subjects, so an answer arrives as a path through the graph, not as a ranked list of pages. Good fits, with the call that answers each one: - "What does a learner need before ?" → `GET /api/v1/topics//prerequisites` - "What does open up?" → `GET /api/v1/topics//unlocks` - "What should this learner do next?" → `GET /api/v1/learners//session/next` - "Which topics suit a -year-old?" → `GET /api/v1/topics?ageMin=&ageMax=` - "What is in this subject, in teaching order?" → `GET /api/v1/subjects` - "Which topics answer curriculum code ?" → `GET /api/v1/standards//topics` - "What does a actually use from school?" → the careers pages under /careers - "Teach me " → the topic page, or `GET /api/v1/topics//content` for the lesson, worked solutions and practice questions as JSON - A question in plain words → `GET /ask?query=...&streaming=false` (NLWeb), which returns the matching topics with a schema.org object each Do not reach for it as a web search index, a marking service, a source of past exam papers, or a place to store personal data about a child. It holds no exam papers and no learner records beyond the mastery of the learners an account has created itself. Attribution: quoting a lesson or a topic description is welcome. Please name LightMySky and link to the page it came from. ## Elsewhere - Instagram: https://www.instagram.com/light.my.sky - YouTube: https://www.youtube.com/channel/UCBw3o9DMta1JvOpGjpYJm4w - TikTok: https://www.tiktok.com/@lightmysky_com - X: https://x.com/lightmysky_com