There are multiple providers supporting CNAME-like functionality on the apex that are compatible with Heroku (and other hostname-based endpoints): * Cloudflare

There are multiple providers supporting CNAME-like functionality on the apex that are compatible with Heroku (and other hostname-based endpoints): * Cloudflare * DNSMadeEasy * DNSimple (my company) * easydns * PointDNS I'm certain more will support it as open source name servers add support.