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elements.heroku.com
In short: Heroku Elements Marketplace (elements.heroku.com) accepts add-on, buildpack or button listing. It is not stated to submit, takes a moderate amount of preparation, and scores 62/100 on our impact ranking (useful).
Build a real Heroku add-on or qualifying open-source buildpack and progress it through the partner release stages.
Add-ons need HTTPS and JSON integration, testing, support and alpha-to-beta review; promotional-only entries do not qualify.
Priority is medium, which sets the band. It is not stated and moderate to complete, which adjusts it within that band. The score ranks your queue — it is not a measure of domain authority.