Prefinery

Prefinery runs the waitlist you put up before launch and gives every signup a queue position that improves when they bring somebody. That mechanic is the product, and the rest is the plumbing around it: the embedded form, the emails, the fraud checks and the export. It bills on how many people join.

Lite is $49 a month for 1,000 users, Essentials $249 for 10,000 and Pro $499 for 50,000, all billed monthly with no annual lock-in. Going over the included users costs half a cent per user per month rather than forcing an upgrade, which is a fairer arrangement than most usage pricing. The API arrives on Essentials, and concierge onboarding on Pro requires a six-month commitment. Every plan has a 14-day trial.

Somebody launching a product who wants the waitlist itself to do the marketing. If you only need to collect addresses, an email tool already does that and costs a tenth as much.