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Computer Science

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Platform profile

Harvard CS50

CS50 is Harvard University's introduction to computer science, widely considered the best free programming course ever made. It's rigorous, engaging, and taught by David Malan. The course covers C, Python, SQL, JavaScript, and more. Free to audit; certificate available for a fee.

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At a Glance

7Courses

7With certificates

YesFree

Go to Harvard CS50

Our take

Our Verdict

Harvard CS50 is the most rigorous free introduction to computer science available anywhere. David Malan is a world-class teacher, and the problem sets are genuinely challenging.

Best for

People who want the rigor of a real university course.

Pros & Cons

Pros

World-class instruction
Problem sets are genuinely challenging
Prestigious Harvard brand

Cons

Certificate requires edX payment
Significant time commitment

In our catalog

All Harvard CS50 Courses (7)

Harvard CS50Certificate

PythonBeginner

CS50's Introduction to Programming with Python

Harvard's introduction to programming using Python. Covers functions, variables, conditionals, loops, exceptions, libraries, unit tests, file I/O, and regular expressions.

4.936hDetails →

Harvard CS50Certificate

PythonBeginner

CS50's Introduction to Computer Science

Harvard's legendary CS50 introduction to computer science. Covers C, Python, SQL, JavaScript, and web programming. The most-enrolled university course in the world.

4.9100hDetails →

Harvard CS50Certificate

JavaScriptIntermediate

CS50's Web Programming with Python and JavaScript

Harvard's web development course covering HTML, CSS, JavaScript, Django, SQL, and API design. Learn to build complex, data-driven web applications. Free to audit; certificate via edX.

4.984hDetails →

Harvard CS50Certificate

SQLBeginner

CS50's Introduction to Databases with SQL

Harvard's dedicated SQL course. Learn to design databases, write complex queries, use indexes, and work with SQLite, MySQL, and PostgreSQL.

4.830hDetails →

Harvard CS50Certificate

Generative AIIntermediate

CS50's Introduction to Artificial Intelligence with Python

Harvard's introduction to AI with Python. Covers search, knowledge representation, uncertainty, optimisation, machine learning, neural networks, and NLP.

4.930hDetails →

Harvard CS50Certificate

JavaBeginner

CS50's Introduction to Programming with Scratch

Harvard's CS50 introductory course starting with Scratch and progressing to Java concepts. The most engaging introduction to programming available anywhere.

4.9100hDetails →

Harvard CS50Certificate

CybersecurityBeginner

CS50's Introduction to Cybersecurity

Harvard's introduction to cybersecurity for technical and non-technical audiences. Covers threats, authentication, networking, system security, and operational security. Free to audit; certificate available via edX.

4.830hDetails →

Head to head

Compare Harvard CS50 with another platform

Judging Harvard CS50 on its own only gets you so far. Each page below puts it head to head with one other platform on cost, certificates, and how deep the free material goes, and every one of them ends in a pick rather than a shrug.

They run in order of how much subject matter the two platforms share, so the near-substitutes for Harvard CS50 come first and the ones that barely overlap sit at the end. Each card names what the other platform is best at, which is usually enough to tell whether the comparison is worth your time.

Harvard CS50vsBoot.devBoot.dev: Backend and Go learners who want structured projects Harvard CS50vsfreeCodeCampfreeCodeCamp: Free verified certificates through a full project-based curriculum Harvard CS50vsKaggle LearnKaggle Learn: Picking up one data skill at a time, fast Harvard CS50vsCodecademyCodecademy: A smooth, zero-setup first taste of a language Harvard CS50vsKhan AcademyKhan Academy: Absolute beginners and younger learners Harvard CS50vsThe Odin ProjectThe Odin Project: Learning to work like a real developer from day one Harvard CS50vsMIT OpenCourseWareMIT OpenCourseWare: Self-directed learners who want raw MIT course material Harvard CS50vsCourseraCoursera: Recognizable industry certificates (Google, Meta, IBM)Harvard CS50vsGoogle for DevelopersGoogle for Developers: Practical web, Android, and ML content from Google Harvard CS50vsedXedX: MIT and Harvard course material without the tuition Harvard CS50vsMDN Web DocsMDN Web Docs: Web development reference and foundational learning Harvard CS50vsDeepLearning.AIDeepLearning.AI: Short, focused AI courses from Andrew Ng's team Harvard CS50vsMicrosoft LearnMicrosoft Learn: C#, .NET, and Azure with hands-on sandboxes Harvard CS50vsScrimbaScrimba: Frontend learners who like coding inside the video Harvard CS50vsAnthropicAnthropic: Building with Claude: prompting, tools, and MCP Harvard CS50vsFull Stack OpenFull Stack Open: Modern React and Node once you can already code Harvard CS50vsHugging FaceHugging Face: Hands-on NLP, transformers, and AI agents Harvard CS50vsHacking with SwiftHacking with Swift: iOS and SwiftUI beginners who want a daily plan Harvard CS50vsTryHackMeTryHackMe: Hands-on, gamified cybersecurity practice Harvard CS50vsAndrej KarpathyAndrej Karpathy: Understanding neural networks from the ground up Harvard CS50vsAWS Skill BuilderAWS Skill Builder: Cloud fundamentals and AWS certification prep Harvard CS50vsCisco Networking AcademyCisco Networking Academy: Networking fundamentals and Cisco certification prep Harvard CS50vsfast.aifast.ai: Getting deep learning working before the theory Harvard CS50vsProfessor MesserProfessor Messer: CompTIA IT certification exam prep (A+, Network+, Security+)

Want the whole field at once instead? All 25 platforms in one filterable table, or the full comparison index.