Best Free Alternatives to CodePen in 2026

Free block-based programming platform and online community for creating interactive stories, games, and animations.

Advanced blocks-based programming language from UC Berkeley for teaching real computer science concepts beyond beginner block coding.

Free math platform combining graphing, geometry, algebra, statistics, calculus, and classroom resources in one ecosystem.

Thunkable is a no-code app builder for designing, building, and publishing native mobile and web apps without coding.

Free graphing and math activity platform with graphing, geometry, 3D, and classroom tools for visual math learning.

Research-based interactive science and math simulations for exploring STEM concepts through virtual experiments.

Open-source blocks-based programming library for building custom visual coding editors and educational coding experiences.

Curriculum-aligned online math program with adaptive practice, games, challenges, and teacher reporting for school or home use.

Free Autodesk web app for beginner-friendly 3D design, electronics simulation, and coding-based STEM projects.

AI app-building platform for creating, deploying, and iterating on web apps, sites, and software projects directly from the browser.

Coding education platform for kids with block coding, Python, JavaScript, game creation, Minecraft, robotics, and STEM pathways.

Education-focused browser coding environment for Python, HTML, and shareable interactive code, but scheduled to shut down in early August 2026.