I'm not sure what "piggyback" SSL means, or "unlimited" for that matter — but no matter; it's clear enough that you're not using SSL as a way of getting people to upgrade.
Thanks for clarifying; the pricing page made it seem like you'd need to upgrade to get SSL, hence my rant. I'll edit the parent a bit to make it less hostile. Sorry about the misunderstanding!
You're absolutely right that it's unclear on the pricing page - we still have some polishing to do.
By "piggyback" I mean SSL on your application's default URLs which are of the form FOOBAR.dotcloud.com.
Unlimited means that, no matter how many domains you host on dotCloud, the price remains the same. This is especially generous since, behind the scenes, each new SSL-enabled domain requires a dedicated IP, which costs us an extra $20-$30/month on EC2.
Props for supporting SSL without additional charges. I wish I could say the same about Squarespace. For some reason, they consider having SSL for account logon as a premium feature.
Since you mentioned SSL for free on *.dotcloud.com, maybe it would be a good idea to force SSL for everyone on your main site: http://i.imgur.com/f1X7n.png steal a cookie get an API key...
On AppHarbor, you also get piggyback SSL by default, as well as you can add custom certificates for free. To be fair - we don't charge anyone yet, but saying nobody else does it is a stretch.
1) Every URL on the platform gets piggyback ssl by default - no add-on necessary. That includes the free tier.
2) A pro account gets you unlimited SSL on your domain, regardless of how many apps you run. Nobody else does that.
We'll make that clearer in the pricing page.