For Substack creators
Run your sponsorships on Substack — without the spreadsheet.
Subscriptions-first publishing with no sponsor CRM. KeelStack is the sponsor operations layer that sits beside Substack: pipeline, magic-link portal, renewal reminders, invoices, and branded reports. Platform-agnostic, flat $39/mo, no percentage of your revenue.
What Substack does well
Substack is built around reader subscriptions. Sponsorships happen as direct deals, which means every operational detail is yours to remember.
What it leaves to you
- No pipeline, so you track sponsors in a spreadsheet or your head.
- No contract dates anywhere — renewals depend on you remembering.
- No sponsor-facing surface at all; everything routes through your inbox.
How KeelStack fits.
It does not replace Substack. It runs the sponsor side that Substack was never built to handle.
A 5-stage pipeline that lives next to your Substack, not inside it.
Automatic 30/14/7-day renewal reminders so a renewal window never slips.
A no-account sponsor portal that makes you look like an agency.
Move one Substack sponsor through the full workflow.
Add the sponsor, send the portal link, watch the assets arrive, then send a report. If it doesn't click in 14 days, walk away.
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Guides that go with this page
- Sponsor asset checklist for newsletters and podcastsExactly what to collect from a sponsor before a placement runs: ad copy, logos, links, specs and deadlines, with a copy-ready checklist for both formats.Read the guide
- Sponsorship renewal email templates for newsletter creatorsCopy-paste renewal emails for the 30-, 14- and 7-day windows, plus what to attach, when to send, and how to handle a 'we'll think about it' reply.Read the guide
- Newsletter sponsorship report template: what to includeA one-page post-campaign report template for newsletter and podcast sponsors: the metrics to include, how to frame them, and what to leave out.Read the guide