Grow your business by sponsoring top-performing newsletters

With Subletter.io, you can easily sponsor over 2,500 newsletters and reach tens of millions of highly engaged readers — paying only for the results you achieve.

Used by thousands of advertisers, from small businesses to global companies

Subletter.io brings together the largest network of companies growing through newsletter sponsorships.
Whether you're a small business, a fast-growing startup, or a global brand, Subletter makes it easy to sponsor newsletters and reach millions of readers in your industry.

With Subletter, you can run results-driven campaigns at any scale, backed by real-time insights and a network of top-performing newsletters.

Sponsor newsletters with confidence

We verify every subscriber list in Subletter’s partner newsletters to ensure the audience is genuine, engaged, and highly qualified — so your campaigns reach the right people and drive real results.

Beyond basic metrics, we track every click with precision:
We analyze geographic location, reader interests, other newsletters read, past campaigns they’ve engaged with, and more.
These data points feed our AI-driven performance algorithm, which continuously evaluates and scores each visitor’s intent — ensuring that every click you pay for comes from a highly qualified prospect.

This intelligence powers smarter sponsorship decisions, helping you invest in the newsletters proven to generate the best returns.

Create your campaign in just a few minutes

Create your ad, set a budget limit, choose newsletters and some targeting options, and launch your campaign easily in just a few minutes. Track performance from your dashboard.

Reach millions of newsletter readers and pay only for the leads or clicks you get

Find the perfect newsletter for your ad from a wide selection of newsletters published across all email platforms.

Sponsor the largest network of publishers and creators, across all categories and countries

Subletter.io brings together thousands of newsletters you can sponsor to reach over 300 million readers worldwide, across every niche. It's one of the most cost-effective channels to gain exposure with your ideal audience and drive more sales.

First Campaign Deal

Get $1,000 in ad credit for you first campaigns

Pay $500 to instantly unlock an additional $1,000 in ad credit—giving you a total of $1,500 to sponsor the newsletters of your choice.

Sponsor over 2,500 newsletters across all categories

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