Turn Your Newsletter Into a Sponsorship Machine
Deal pipeline, auto-updated media kit, ad-slot calendar and invoicing — everything you need to sell your ad inventory, plus an average +18% CPM.
Trusted by 400+ newsletter teams
Everything You Need to Manage Sponsors
Keep every sponsorship safely organized under one roof — from the first outreach reply to the paid invoice, whether you write alone or lead a team.
Deal Pipeline
Every sponsor conversation tracked through lead, negotiating, booked, live and paid — built into your workflow, not another spreadsheet.
Auto-Generated Media Kit
A public rate page that rebuilds itself from your subscriber count and open rate, with a single link that never goes stale.
Ad-Slot Calendar
Every placement in every issue on one calendar, so overbooking a slot becomes structurally impossible.
Built-in Invoicing
Invoices go out the moment a deal closes, with automatic reminders until the money actually lands.
CPM Benchmark
See what newsletters your size, in your niche, actually charge — anonymized and updated monthly.
How It Works
From connected newsletter to paid invoice in four steps.
1Connect your newsletter
Sync your ESP stats — subscribers and open rate, nightly.
2Share your media kit
One link, always up to date with live rates and availability.
3Track the deal
Pipeline from lead to paid, with automatic follow-ups.
- 4
Get paid on time
Invoicing + reminders built in, tracked on your dashboard.
Never Miss a Publication Deadline Again
Sponsley maps every booked slot onto your publishing schedule, reminds sponsors when creative is due, and flags issues that still have unsold inventory.
Learn MorePrice Every Slot With Confidence
Compare your rates against anonymized deals from newsletters in your niche and size bracket, and get a suggested rate card you can defend in any negotiation.
Learn MoreMulti-Newsletter
Run every publication you own from one workspace.
Flexible Rate Cards
Different rates per slot, per season, per sponsor tier.
ESP Integrations
Subscriber stats sync nightly from your email platform.
Team Accounts
Bring in your ops person without sharing your login.
What Newsletter Operators Say
See how 400+ teams are building healthier sponsorship businesses.
Mara Ellison
Writer & founder, The Splice
“I ran sponsorships out of a spreadsheet for three years. The week I switched, the pipeline view surfaced $4,000 of unsold inventory sitting in my next quarter.”
Dev Okafor
Publisher, Morning Loop
“Sponsors used to ask for our media kit and I'd panic-update a PDF at midnight. Now I send one link, and it's never out of date because it updates itself.”
June Park
Co-founder, Inbox Atlas
“We double-booked our main slot twice last year. Since the ad-slot calendar went in: zero. And creative shows up on time because Sponsley does the nagging, not me.”
Tomás Rivera
Growth lead, Signalcraft
“The benchmark gave us cover to raise rates twice in twelve months. Nobody pushed back, because the number wasn't ours — it was the market's.”
A Better Way to Monetize Your Newsletter
Sponsley helps you sell every slot, invoice on time and raise your rates — by linking your pipeline, calendar and media kit into one workflow.