Cal ID tech stack
Schedule and monetize meetings for free
cal.id ↗Checked Sep 2026
The stack
On its website: DNS: s1._domainkey.cal.id CNAME s1.domainkey.u37485059.wl060.sendgrid.net; DNS: s2._domainkey.cal.id CNAME s2.domainkey.u37485059.wl060.sendgrid.net source · Oct 2026 ↗
“After trying a few alternatives, we landed on PostHog, which helped us deeply understand user behavior in our MVP stage. It directly shaped what made it into the final Cal ID experience.” — the maker, Sep 2026 ↗
“Cursor saved us hours by spotting and fixing bugs before we could. Easily one of the smartest coding copilots we've used.” — the maker, Sep 2026 ↗