For startups
Capture demand before you have built the thing it is for
Put a waitlist or demo request form on a landing page in minutes, see every signup in Slack as it arrives, and pull the list into your own systems through a signed webhook or the submissions API when you are ready to launch.
What it handles
Launch before the backend exists
A landing page often ships weeks before the product has a database. A form endpoint means the waitlist works from day one on a static page, and nothing has to be migrated when your real backend arrives.
Signups where the team already is
On paid plans, every signup can post to a Slack channel as it lands, and routing rules can send demo requests from larger companies somewhere different from newsletter signups. The first hundred signups are a signal worth watching live.
Your list, in your systems
On paid plans, signed webhooks deliver each submission to your own code with an HMAC signature to verify, retried on failure, and the submissions API lets you export or sync the whole list on your schedule. Nothing locks the data in here.
Built for agents as well as people
With an API key on a paid plan, a read-only MCP server lets Claude, ChatGPT or your own agent answer questions about signups in plain language, and a write API can create forms and destinations from a script, so setting up a new landing page does not mean clicking through a dashboard.
The limits, plainly
It is not a CRM or an email marketing tool. There is no lead scoring and no sequence builder; send submissions to the tools that do those things.
Which plan
Free handles a quiet launch at 300 submissions a month by email. Pro at $5 a month is where Slack, webhooks, routing and the submissions API come in, with 12,000 submissions of headroom for a launch that goes better than planned.