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substack.com
In short: Substack (substack.com) accepts profile/newsletter post. It is free + paid tier to submit, takes only a few minutes, and scores 45/100 on our impact ranking (long tail).
Create your tool updates newsletter with homepage link.
Useful if maintained; not one-off spam.
Priority is later, which sets the band. It is free + paid tier and quick to complete, which adjusts it within that band. The score ranks your queue — it is not a measure of domain authority.