After 6 years of running a newsletter, I got tired of the sponsorship grind and built a tool to fix it

I've run Tailwind Weekly (a newsletter for developers) for 6 years. Selling sponsorships paid the bills, but the process never stopped being painful.

Every single new sponsor was the same routine: someone reaches out, I dig up my subscriber count and open rate, write up my ad options and pricing, and send it all over. Then comes the email back-and-forth — what dates are open, is this slot taken, can I move to next week, how do I pay. Multiply that by every sponsor and I was spending hours each month being the bottleneck on my own revenue.

The existing tools didn't fit. Sponsy is $79/month, which is overkill for a solo operator. Paved takes a 30% commission and locks you into their marketplace. Passionfroot pivoted to serving brands. So most small creators just live in spreadsheets and email threads, like I did.

So I built Sponsonizer — basically Calendly for newsletter sponsorships.

You set up your ad slots and pricing once, build a public booking page, and share the link. Advertisers see everything upfront, pick a slot, choose their dates from a calendar, and pay — no account, no email ping-pong. I just get a notification and approve or reject with one click. If I reject, they get an automatic refund.

The model: Free tier takes a 7% cut per booking through Stripe Connect. Pro is $99/year for 0% fees plus custom branding (fonts, colors, no "Powered by"). I picked a percentage cut over a monthly subscription because newsletter sponsorships are lumpy — nobody wants to pay monthly for a tool they use heavily in Q4 and barely touch in January.

I'm dogfooding it on Tailwind Weekly itself, so my own booking page is the live demo.

Right now I just launched, but happy to answer anything about the build, the pricing decision, or selling newsletter sponsorships in general. And if you run a newsletter, I'd genuinely love feedback on whether this solves a real problem for you too.