Cosmo: Learn GenAI & More

CodeSignal

In-app purchases

About this app

Build real skills in just minutes a day. No videos. Just doing.

Cosmo is your personal AI tutor, always ready with hands-on lessons that adapt to you. Whether you're between classes, commuting, or on a break, you’ll make real progress in GenAI, business, tech, and more.

Built by CodeSignal, the AI platform 3,000+ top employers trust for hiring — including Google, Meta, Zoom, Netflix, TikTok, and Anthropic. Loved by over 1 million learners who build and prove their skills with CodeSignal.

🎯 Why Cosmo?
• Cosmo, your AI tutor, guides your journey and adapts to you so you learn faster.
• Cosmo makes learning fun. With practice-based lessons, you'll build real skills in just a few minutes a day.
• Master the most in-demand skills to grow your career.
• Earn shareable certificates and skill badges to show off all you've learned.
• Learn through courses or have Cosmo help you practice any topic instantly.

📚 Every course is free. Learn GenAI, business, marketing, sales, finance, accounting, product management, project management, leadership, communication, emotional intelligence, Python, JavaScript, Go, Swift, Kotlin, Rust, web development, cloud, SQL, data science, analytics, machine learning, data engineering, personal finance, focus, decision making, critical thinking, public speaking, habit formation, and more.

💼 Learn 200+ career-building skills
GenAI
Understand how ChatGPT works and how to apply GenAI at work. Practice prompt writing and explore AI use cases across roles and industries.

Finance
Learn finance, economics, accounting, public markets, and how businesses are valued.

Marketing
Build skills in digital advertising, branding, SEO, content, and demand generation.

Coding
Learn to code in Python, JavaScript, Go, Swift, Kotlin, and Rust. Understand the web and cloud from the ground up.

Data
Practice SQL and Python for data science. Get started with analytics, machine learning, and data engineering.

Leadership
Improve communication, people skills, and strategic thinking. Choose tracks for engineers, sales, recruiters, first-time managers, and students.

Personal Growth
Learn focus, confidence, habit formation, clear decision making, and personal finance.

Startups
Turn ideas into action with courses on starting a tech company, local business, or creator brand.


✨ If you like Cosmo, try Cosmo+ to master skills faster with unlimited energy.

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Ratings and reviews

The apps runs smoothly. The lessons feel less hands-on and more like simply chatting, unlike how the website works. There is a range of courses available but limited in number compared to the website. Overall, I prefer the website because the app doesn't have the courses I need, yet. There are not ads btw, atleast none so far into the app.

They've copied Duolingo's format well but have failed in a major area: Getting the user hooked. Less than 6 minutes into an initial area of study (Python), the learning stopped. I was given the option to "Try Cosmo+ for free" for 30 days or "Wait until tomorrow." Don't appreciate their deceptive approach to getting users. I'm left feeling used.

Sometimes Cosmo has something in his mind to say next and my response becomes void for him. He does not take my response into account and he says what he "needs" to say. I feel like this is somehow necessary to keep the conversation in the scope of the lecture, but I believe at least it should not give the fake sense of interaction.