WaitFast: Waitlists and Email Capture Built for Shipping

WaitFast is a waitlist and email-capture platform for founders and creators. Spin up a branded waitlist page in minutes, drop an embeddable signup widget into any site, collect subscribers, and send them targeted campaigns — all from a single dashboard, without the overhead of enterprise email tools.

The Problem

Most early-stage projects die on the vine because they have nowhere to capture interest. People land on a landing page, nod, and leave. By the time the product ships, the audience is gone. The existing options — Mailchimp, ConvertKit, Beehiiv — are overkill for a team that just needs a page, a form, and a send button.

How It Works

1. Create a project — Spin up a branded waitlist page (e.g. waitfast.com/your-slug) or generate a widget snippet for an existing site.
2. Collect signups — Every submission lands in the same subscriber store, tagged by source, deduped, and ready to segment.
3. Send campaigns — Write an email, pick an audience, send it through Resend (or your own SMTP domain), and watch delivery stats roll in.

Key Features

Waitlist Builder

Branded, hosted waitlist pages with custom copy, colors, and a public URL — no code required.

Embeddable Widget

One signup widget that drops into React, Next.js, Vue, Svelte, Angular, plain HTML, and Framer sites. CORS preflight handling keeps it working safely across origins.

Email Campaigns

A Tiptap-powered editor for writing campaigns, with delivery stats (open rates, bounces) surfaced per send.

Custom SMTP Domains

Bring your own domain and send from hello@yourcompany.com instead of a shared sender. Domain + email address models handle the verification flow.

Referral Tracking

Optional referral incentives inside the widget — subscribers share a unique link and move up the list.

CSV Export

Own your data. Export the full subscriber list anytime.

Tech Stack

• Frontend: Next.js 16 (App Router), React 19, Tailwind CSS v4
• Data: MongoDB with Mongoose, TanStack Query v5 for client-side fetching
• Auth: NextAuth.js
• Email: Resend for transactional + campaign delivery
• Payments: Polar for checkout and subscriptions
• Editor: Tiptap for the campaign composer
• UI: shadcn/ui, Framer Motion, react-hot-toast

Security

Campaign HTML passes through sanitize-html and DOMPurify to block CSS and XSS injection. Per-IP rate limiting protects signup endpoints. CORS preflight handling and a hardened CSP keep the embeddable widget safe to drop into third-party sites.

Source on GitHub.