Your coding 
Pick a program and learn it end to end. Tee teaches every topic, quizzes you, runs your code and opens the right page when you ask, then hands you real projects to build.
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Your whole field. Taught.
Programs
Structured developer programs, taught track by track. Each track unlocks when you finish the one before.
- Programs
- 8
- Tracks
- 53
- Topics
- 937
AI Engineer
A curriculum for developers who want to build AI-powered applications, covering prompt engineering, models, embeddings, vector databases, RAG, agentic AI, and evaluation techniques.
Backend
A curriculum for developers who want to master backend development, covering API design, data storage, security, distributed systems, and scaling techniques for building robust server-side applications.
Data Analyst
A curriculum for aspiring data analysts covering analytics foundations, descriptive statistics, data analysis and modeling, data visualization, big data, and an introduction to deep learning.
DevOps
A curriculum for aspiring and practicing DevOps engineers covering environment fundamentals, servers, networking, cloud infrastructure, provisioning, deployment, observability, and GitOps practices.
Frontend
A curriculum for aspiring frontend developers covering web fundamentals, AI-enhanced development, tooling, advanced topics, frameworks, deployment, and beyond-the-browser technologies.
Full Stack
A curriculum for aspiring full stack developers covering web foundations, React and Node.js, data and authentication, AWS fundamentals, and infrastructure with CI/CD.
JavaScript
A curriculum for developers who want to learn JavaScript from the ground up, covering fundamentals, data types, data structures, control flow, operators, functions, asynchronous programming, and advanced concepts.
Python
A curriculum for learners aiming to master Python, covering fundamentals, advanced concepts, package management, frameworks, concurrency, and essential tooling.
One active program at a time. Your XP stays with you when you switch.
Programs
Structured developer programs, taught track by track. Each track unlocks when you finish the one before.
- Programs
- 8
- Tracks
- 53
- Topics
- 937
AI Engineer
A curriculum for developers who want to build AI-powered applications, covering prompt engineering, models, embeddings, vector databases, RAG, agentic AI, and evaluation techniques.
Backend
A curriculum for developers who want to master backend development, covering API design, data storage, security, distributed systems, and scaling techniques for building robust server-side applications.
Data Analyst
A curriculum for aspiring data analysts covering analytics foundations, descriptive statistics, data analysis and modeling, data visualization, big data, and an introduction to deep learning.
DevOps
A curriculum for aspiring and practicing DevOps engineers covering environment fundamentals, servers, networking, cloud infrastructure, provisioning, deployment, observability, and GitOps practices.
Frontend
A curriculum for aspiring frontend developers covering web fundamentals, AI-enhanced development, tooling, advanced topics, frameworks, deployment, and beyond-the-browser technologies.
Full Stack
A curriculum for aspiring full stack developers covering web foundations, React and Node.js, data and authentication, AWS fundamentals, and infrastructure with CI/CD.
JavaScript
A curriculum for developers who want to learn JavaScript from the ground up, covering fundamentals, data types, data structures, control flow, operators, functions, asynchronous programming, and advanced concepts.
Python
A curriculum for learners aiming to master Python, covering fundamentals, advanced concepts, package management, frameworks, concurrency, and essential tooling.
One active program at a time. Your XP stays with you when you switch.
Choose a program.
Learn it end to end.
Data Analyst
100
topics6 tracks · 206 h
Starts withAnalytics Foundations & Excel
Frontend
113
topics6 tracks · 211 h
Starts withWeb Fundamentals & Frontend Basics
Everything between you
and the skill.
Ask, and Tee takes you there.
Teach me closures. I keep getting lost.
- Opened JavaScript · Track 6
- Highlighted Closures
- Opened the Closures guide
The chat railBeside every page
JavaScript · Track 6Functions & Async
- Lexical scoping
- Closures
- Callback Hell
- Event Loop
Tee openedThe page you needed.
Tee
Let me find the right page.
Learn it step by step.
Concept
A function remembers the variables from where it was made.
TakeawayInner functions keep their scope.Closures · Lesson
1/ 5 steps
ThenThe quiz
Stuck on a step? Ask Tee without leaving the lesson.
Run it right here.
counter.jsTry it · runs in your browser
function makeCounter() { let count = 0; return () => ++count;}const next = makeCounter();console.log(next(), next(), next());Output
Run your code to see the output here.
Prove it in five questions.
Closures · QuizQuestion 5 of 5
Q5 Pass at 70%
What does next() return the third time it runs?
3 of 4 so far. You need 4 of 5 to pass.
Tee
Five questions, drawn from a pool of eight.
Open the next track.
JavaScript7 tracks · 194 h
Functions & AsyncOpen now
Skip what you know.
Start where you are
Tee
Connect GitHub and I’ll look at what you’ve already built.
Keep the streak going.
Your dashboardJavaScript · active program
Total XP0 XP
Streak8 daysThis week+690 XP
Build something real.
Projects to build105 in the catalog
AccordionbeginnerHTML · CSS · JavaScript
Custom DropdownintermediateHTML · CSS · JavaScript
24hr Story FeatureadvancedJavaScript · Storage · Timeouts
You could juggle forty tabs.
Or you could have Tohrr.
| The work | Doing it yourself | Tohrr |
|---|---|---|
Learn | ||
| Whole programs, split into tracks & topics | Deciding what to learn next | Included |
| A roadmap of every track & topic | Piecing a path together from lists | Included |
| Tracks that unlock in order | Guessing what comes first | Included |
| Interactive lessons with diagrams & video | Hunting for the right tutorial | Included |
Practice | ||
| JavaScript & TypeScript runner in the browser | Setting up somewhere to run code | Included |
| Try-it code exercises | Inventing your own exercises | Included |
| A quiz at the end of each lesson | Testing yourself | Included |
| Test out of tracks you already know | Sitting through what you know | Included |
Build | ||
| 105 real projects, matched to your track | Finding a project at your level | Included |
| Beginner, intermediate & advanced builds | Guessing if a project is too big | Included |
| Credit for what you’ve built on GitHub | Starting again from the basics | Included |
Track your progress | ||
| XP that stays yours | A spreadsheet of what you’ve covered | Included |
| A daily streak in your active program | Keeping yourself accountable | Included |
| Program progress & a 4-week activity grid | Remembering where you left off | Included |
Work with Tee | ||
| A tutor for every topic | Searching for an answer that fits | Included |
| Ask anything, mid-lesson | Pausing to search forums | Included |
| Tee opens the right page & highlights what matters | Clicking around to find your place | Included |
| A chat rail beside every page | Explaining your context again | Included |
Good questions.
Straight answers.
Who is Tohrr for?
Anyone who wants to learn a developer field properly, from the first topic to real projects. Pick a program, like Frontend, Backend, Python or AI Engineer, and Tee, your tutor, teaches it end to end.
What’s a program?
A whole field, like Frontend or DevOps. Each program is split into tracks, and each track into topics: 8 programs and 937 topics so far. Tracks unlock in order. Finish one, or test out of it, to open the next. You work on one program at a time.
How does Tee teach?
Ask Tee anything from the chat beside every page. He opens the right page, highlights what matters and teaches from there. A growing set of topics have interactive lessons: four to seven short steps, like a diagram, a video or code to try, then a quiz. Pass it to complete the topic and earn XP. Every other topic has a guide, and Tee can teach it too.
Do I need to know how to code?
No. Programs start from the fundamentals. JavaScript opens with JavaScript Fundamentals, Python with Python Fundamentals and Frontend with Web Fundamentals & Frontend Basics. Ask Tee whenever something doesn’t click.
Can I skip what I already know?
Yes. Test out of a track by answering a few short questions from it. Pass, and the next track opens. When you sign up, you can also connect GitHub. Tohrr looks at your repos and suggests what you can skip.
What code runs in the browser?
JavaScript and TypeScript. The try-it steps in a lesson run your code in a built-in runner, so there’s nothing to install. Other languages, Python included, don’t run in the browser.
Is this a mobile app?
Tohrr is a web app. Open it in your browser on desktop or mobile.
What happens when I join the waitlist?
It’s free to join. We’ll email you once, when we open.