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codesandbox.io
In short: Getting listed on CodeSandbox is free. Plan for about 10 minutes — it is a form plus links and assets you already have.
What they ask for: Publish a small open demo that explains one your tool algorithm or UI pattern and add the product website to the founder profile links.
Publish a small open demo that explains one your tool algorithm or UI pattern and add the product website to the founder profile links.
The sandbox must run and provide reusable technical value; public projects and profile links are UGC and may be nofollowed.
Open the submission page on codesandbox.io and complete its form — that is the "Open submit page" link at the top of this page.
The sandbox must run and provide reusable technical value; public projects and profile links are UGC and may be nofollowed.
Priority sets the band — this one is high. Cost (free) and effort (quick) move it within that band, which puts it in the high impact tier. The score orders a submission queue. It is not a measure of the site’s domain authority, traffic or quality.