Ask HN: Tips on promoting SaaS for computational math

Genuinely curious. Built the product, but promoting it, getting signups - not sure. Our biggest use-case is for Coursera courses, but posting on a course there gets us labelled as spammers. Tried posting here, and on Reddit as well - nothing really seems to work. Would appreciate any tips you chaps might have.

You could find out more on us here: http://mathharbor.com