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codepen.io
In short: CodePen (codepen.io) accepts public pens plus indexed profile links. It is free to submit, takes only a few minutes, and scores 86/100 on our impact ranking (high impact).
Build original interactive web-tool demos as public Pens, write useful details and add your tool among up to three profile links.
Public Pens are MIT-licensed and searchable; share real demos rather than thin promotional pages.
Priority is high, which sets the band. It is free and quick to complete, which adjusts it within that band. The score ranks your queue — it is not a measure of domain authority.