Substack ads are not what most media buyers expect. There is no self-serve dashboard where you upload a creative, pick an audience and set a bid. Substack built its business on reader subscriptions, and the platform has historically kept programmatic display advertising out of newsletters. What you can buy is space inside individual publications: a sponsored section, a dedicated send, a mention in a podcast episode hosted on Substack, or a co-branded piece of content. You negotiate each of those with the writer, not with the platform.
That makes Substack advertising slower to set up than a Google Ads campaign, but it also explains why the channel can be so profitable. Readers on Substack chose to let a specific writer into their inbox, and many of them pay for the privilege. A sponsor that fits the publication borrows some of that trust. This guide covers how Substack sponsorships are sold, what they usually cost, how to choose publications, how to write the placement and how to measure the results honestly enough to know whether to scale.
How Advertising on Substack Actually Works
Because the platform does not run an ad network on newsletters, every Substack ad is a direct deal. In practice you will see four formats:
- Sponsored slot in a regular issue. A short block, usually near the top or in the middle of the post, with a headline, two or three sentences and a link. This is the most common format and the easiest to test.
- Dedicated send. The writer sends an entire email about your product to their list. Expensive, rarer, and usually reserved for sponsors the writer already knows.
- Podcast or video reads. Many Substack writers now publish audio and video. Host-read mentions here behave much like traditional podcast ads, with the same strengths and the same measurement problems.
- Content partnerships. A sponsored deep dive, report or interview series. These cost more and take longer, but they produce an asset you can reuse on your own channels.
Policies and features on the platform change, so before you plan a large program, read Substack's current terms and ask each writer what their publication allows. Some writers refuse sponsors entirely to protect the paid tier. Others sponsor only the free version of their newsletter, so paying subscribers get an ad-free read.
Why High-CPC Advertisers Are Paying Attention
The keyword "substack ads" carries an unusually high cost per click in Google Ads, which tells you something about who is searching for it. B2B software companies, fintech brands, investment research firms and premium DTC products are looking for audiences that are hard to reach on social platforms. Several things make Substack attractive to them.
Concentrated, self-selected audiences. A newsletter about SaaS pricing, healthcare policy or fly fishing gathers exactly the readers you would struggle to isolate with interest targeting. Many niche publications have a few thousand subscribers who are almost all decision makers in one field.
Inbox attention. Open rates on strong Substack publications commonly sit well above the averages for brand email, because readers subscribed to a person rather than a company. Your message lands in an environment with far less competition than a social feed.
Fewer signal-loss problems. Newsletter sponsorships do not depend on third-party cookies or mobile device identifiers. You measure them with your own links, codes and surveys, which have held up better through privacy changes than pixel-based attribution.
Brand halo. When a writer the reader respects introduces your product, the endorsement carries further than an impression ever could. This is the same mechanism that makes host-read audio work.
The trade-off is scale. You will rarely find one publication that can absorb a large budget, so a serious Substack ads program means buying across many writers and managing a lot of small relationships.
What Substack Sponsorships Cost
Newsletter sponsorships are usually priced on a CPM basis (cost per thousand subscribers or opens) or as a flat fee per issue that works out to an implied CPM. Prices vary widely with niche, audience seniority and engagement, but some patterns hold:
- Broad consumer newsletters tend to sit at the lower end of the CPM range, because the audience is general and the writer has many sponsor options.
- Professional and B2B newsletters command far higher CPMs. A list of 8,000 CFOs or engineering leaders is worth more per reader than a list of 200,000 casual readers, and writers know it.
- Dedicated sends are priced at a large multiple of a sponsored slot, often several times the cost of a standard placement.
- Packages of three to six issues usually come with a discount and tend to perform better, because readers need repeated exposure before they act.
Before you agree a price, convert every quote to an effective CPM based on opens, not list size. A writer with 50,000 subscribers and a 25% open rate is delivering fewer impressions than a writer with 20,000 subscribers and a 70% open rate. Run the numbers through our CPM calculator so you can compare offers on the same footing.
Then work backwards from what a customer is worth to you. If your average customer lifetime value is high, you can afford a CPM that would look absurd on Meta. Use the LTV calculator to set that ceiling before you start negotiating, not after.
How to Choose the Right Publications
The publication you pick decides most of the outcome. A mediocre ad in the right newsletter will beat a brilliant ad in the wrong one.
Start with audience fit, not size
Write down the one or two job titles or customer profiles you need to reach. Then look for writers whose readers match that profile closely. Substack's own discovery pages, its leaderboards by category and the Recommendations that writers place on their publications are good places to start mapping a niche. When a writer you like recommends three other newsletters, those three usually share a large part of the same readership.
Ask for the right data
Any writer who takes sponsors should share a basic media kit. Ask for:
- Total subscribers and the split between free and paid
- Average open rate over the last ten issues
- Average click rate on links in past sponsored placements
- Audience breakdown by role, industry, company size or geography, if they collect it
- Examples of past sponsors and whether those sponsors rebooked
Rebooking is the most honest signal you can get. A writer whose sponsors keep coming back is delivering results, even if the writer cannot prove it with attribution data.
Read the archive
Spend twenty minutes reading recent issues. Check the tone, how sponsors are introduced and whether the comments section shows engaged readers. If the writer's voice is sharply critical of companies like yours, the placement will hurt you.
Test small, then concentrate
Book single issues with five to ten publications before committing to packages. Most programs find that a small number of newsletters produce most of the results. Move budget to those and keep testing new ones at the edges.
Writing a Substack Ad That Converts
Newsletter readers skim sponsor blocks the way they skim everything else. You have a headline and two or three sentences to earn a click.
Lead with the reader's problem. "Closing the books takes your team two weeks" is more compelling than "Introducing Acme Finance."
Let the writer adapt it. Give the writer your key points, your offer and your link, then let them write it in their own voice. Copy that sounds like the rest of the newsletter outperforms polished brand copy that sounds pasted in. If the writer actually uses your product, ask them to say so.
Make one clear offer. A free trial, a demo, a downloadable report or a discount code. One link, one action. Readers who have to choose between three calls to action usually choose none.
Match the landing page to the placement. Send readers to a page that repeats the newsletter's framing and the offer, not your generic homepage. If your landing page converts poorly, no sponsorship will save the campaign. Check your baseline with the conversion rate calculator and fix the page before you spend money sending traffic to it.
Repeat. One sponsored slot rarely moves a B2B buyer. Three placements over six weeks in the same publication give readers time to recognise you and act when the timing suits them.
Measuring Substack Ads Without Fooling Yourself
Measurement is where most newsletter programs go wrong. Last-click attribution will undercount Substack sponsorships badly, because many readers see the ad, remember the brand and search for you later on Google. If you judge the channel only on tracked clicks, you will cut it even when it is working.
Use several signals together:
- Unique UTM links per publication and per issue. These give you direct clicks and on-site behaviour. Our conversion tracking guide covers how to set these up so they flow cleanly into analytics and your CRM.
- Unique offer codes or landing pages. A code like WRITERNAME20 captures readers who come back later and type your URL directly.
- "How did you hear about us?" on sign-up forms. Make it a free-text field. Self-reported attribution regularly surfaces newsletter mentions that never showed up as clicks.
- Branded search lift. Watch branded search volume and direct traffic in the days after a send. A visible bump after each placement is strong evidence the channel is driving demand.
- Blended cost per acquisition. Add up all sponsorship spend and divide by the new customers you can reasonably attribute through any of the signals above. Check it against your targets with the CAC calculator.
If you already run a multi-touch model, add newsletter sponsorships as their own channel rather than lumping them under referral traffic. Our guide to marketing attribution software explains which tools can ingest offline and self-reported touchpoints alongside clicks.
Finally, compare revenue to spend once you have at least two months of data. A ROAS calculator gives you a quick read, but for B2B products with long sales cycles, judge the channel on pipeline created and expected lifetime value rather than first-month revenue.
Substack Ads vs Other Paid Channels
Substack sponsorships work best as part of a broader mix, not as a replacement for search or social.
- Compared with search ads, they create demand instead of capturing it. Someone reading about a problem in their favourite newsletter may not have been searching for a solution yet.
- Compared with social ads, they trade targeting precision and scale for trust and attention. For niche B2B audiences, that trade is often worth it.
- Compared with podcast ads, they are easier to track, because readers can click immediately, but they lack the intimacy of a voice the listener hears every week.
- Compared with your own email list, they reach people who have never heard of you. Once they convert, nurture them through your own targeted email marketing so the sponsorship cost is spread over a longer relationship.
For direct-to-consumer brands, Substack sponsorships sit naturally alongside the creator and influencer placements covered in our DTC ads guide. For B2B brands, they are closest to a brand awareness campaign that also produces measurable leads.
A Simple 60-Day Test Plan
If you are new to newsletter sponsorships, this plan gives you a clear answer without risking much budget:
- Week 1: Shortlist 15 to 20 publications that match your customer profile. Request media kits and read their archives.
- Week 2: Book single placements in the 6 to 8 best-fit newsletters. Set up unique UTMs, codes and landing pages for each.
- Weeks 3 to 5: Run the placements. Track clicks, sign-ups, branded search and self-reported attribution daily.
- Week 6: Rank publications by blended cost per lead or customer. Drop the bottom half.
- Weeks 7 to 8: Book multi-issue packages with the top two or three performers and add two new test publications.
After two months you will know whether Substack ads deserve a permanent line in your media plan, and you will have a short list of writers worth building long-term relationships with.
FAQ
Does Substack have ads? Substack has not built its business on display advertising, and newsletters on the platform do not carry programmatic banner ads. Advertising happens through direct sponsorships that brands negotiate with individual writers. Check Substack's current policies, since platform features change over time.
How much do Substack ads cost? Pricing is set by each writer, usually as a flat fee per issue or a CPM. Niche B2B and professional newsletters charge much higher CPMs than broad consumer publications. Always convert quotes to a cost per thousand opens so you can compare them fairly.
Can you run ads on Substack to grow your own newsletter? Yes. Writers often sponsor other newsletters with overlapping audiences to gain subscribers, and Substack's free Recommendations feature lets writers promote each other without payment. Paid swaps and sponsorships work well when you track cost per subscriber.
How do I track the ROI of a Substack sponsorship? Combine unique UTM links, offer codes, a free-text "how did you hear about us" field and branded search trends. Last-click attribution alone will undercount the channel, because many readers come back later through search or direct visits.