I Built A Tool Every Substack Writer Needs. And It's Not AI.
A trust-based system for building backlinks together. No spam, no SEO tricks, no admin headaches.
TL;DR: Backlinks still move the needle on Substack in 2026, even on the shared substack.com domain, because every outbound link is dofollow by default and signals topic authority. Google penalizes scale and manipulation, not genuine editorial links between related writers. The newer stakes: AI engines like ChatGPT, Perplexity, and Google AI Overviews cite sources, and Substack earns just ~0.07% of citations, so trusted dofollow swaps are now a route to getting cited, not only ranked. LinkSwap is the tool I built to do this at human scale, reader-first, three minutes a week. Free for premium members.
I’ve been staring at this idea for months without being able to name it. Something felt obvious, but just out of reach.
It kept coming back to this:
Substack runs on trust
What could we build with that trust to help each other grow?
One day, after digging myself out of another rabbit hole about SEO and AIO for my own Substack, it finally clicked.
Backlinks.
Not the spammy kind, not the Fiverr-bought kind, not the SEO-bro kind.
Backlinks done right: curated partnerships between writers who trust each other. All in service of our readers. Three minutes a week.
What’s Inside
Trust as Infrastructure
A free subscription is a small act of trust. A paid subscription is a big one.
When I pay for someone’s work, I’m saying: I trust your judgment, your taste, your way of seeing the world. When people pay for mine, they’re saying the same back.
And when I look around Substack it’s clear that the willingness to share each other’s work is already here.
What’s been missing is the infrastructure. So I built it.
Hey, I’m Karo Zieminski 🤗
AI Product Manager and builder.
I write Product with Attitude, an AI newsletter for thousands of subscribers developing critical AI literacy the only way it sticks: through practice.
We don’t just use AI. We build workflows, automations, and products with it, while studying how AI itself is built, positioned, and woven into our work.
If you’re new here, welcome!
Bringing in the Experts
I’m a good researcher, but I’m not an SEO expert. So I brought this to Kathleen Marrero, who focuses on SEO and entity-based search strategy.
Kathleen generously went far beyond what I asked for, bringing real expertise, care, and depth to every section of this article.
Why Backlinks Still Matter In 2026
Backlinks are links from one site to another that search engines treat as votes of confidence about credibility and relevance.
In 2026, the data still says the same thing: high-quality backlinks help pages rank higher.
Backlinks do three things:
They help search engines understand topic authority. When relevant sites link to us using natural language around our topic, they add context: this page belongs with serious resources on this topic, not random content.
They speed up crawling and indexing, because links from already‑trusted pages act like fast lanes into the search engine’s attention.
As WTF is SEO explains, internal links are little bits of SEO dust, sprinkling authority across your stories. On Substack, cross-author links serve the same function.
One detail many writers miss: every outbound link in a Substack post is dofollow by default. There's no nofollow tag to strip the value out. That means a link from another writer is a real editorial backlink that passes full link equity, the exact kind that moves rankings. Reddit, Quora, and forum links are all nofollow by comparison. As Ali Tanweer independently verified, all outbound links on Substack are dofollow by default, passing real link equity.
Why Highlighting Other Writers Makes Your Publication Stronger
I get this question surprisingly often, probably because I link to other writers constantly: aren’t you worried about giving attention to your competition?
But that assumes attention is something you should trap. And I believe that attention is something you earn by creating value.
Pointing my readers to great adjacent writers saves them time, respects their curiosity and adds value.
Connecting learners with learners and builders with builders works the same way.
So bringing this kind of curation into the community feels like the natural step.
But it takes time.
Reading newsletters to curate is the fun part. Messaging everyone to agree on which posts to link, when, and why—that can easily turn admin work. Raise your hand if you enjoy admin work. I don’t.
What This Means For Reader Experience
That’s why I think the idea is amazing, because it encourages writers to connect their work in ways that benefit readers first.
When I think about the last time I discovered a great writer, more often than not it was a link inside a post I was already reading, placed there by someone whose taste I trust.
That’s what a good backlink swap looks like from the reader’s side.
Not an ad, not a recommendation widget. A human saying: this person’s thinking belongs right here, in this context, and it’s worth your next ten minutes.
And when I’m fully absorbed in a topic, I’m past the point of needing to be talked into more reading.
LinkSwap For Substack Writers
LinkSwap is a tool I built specifically for us, Substack writers, to swap backlinks in a deliberate, trackable, trust-based and non-spammy way.
The idea is simple:
Post a request. Let other writers know what you wrote about and that you’re open to a backlink collaboration.
Respond. Other writers propose a match. You read their articles and accept or not.
Swap. Both parties add the links and confirm once links are live.
Track. Who linked whom, in which post.
Filter by topic and find swaps that make sense for your audience.
The philosophy underneath: use existing trust to create new pathways. If I already trust your work enough to subscribe or pay, linking to you is service to my readers.
From Kathleen Marrero:
Think of the network of writers as a knowledge ecosystem.
When multiple writers consistently reference each other on a shared topic, it helps search engines understand the conversation around that topic.
Search engines increasingly rely on relationships between content rather than evaluating isolated pages.
Done systematically, without gaming anything, this builds a network of high-quality, contextual backlinks that help readers discover more good work, help writers grow their audiences, and help search engines see the shape of our corner of the internet more clearly.
SEO Questions I Needed To Clarify
Same Domain Backlinks
I was unsure whether backlinks even matter when most of Substack writers share the same domain.
They do.
Even on a shared domain, links still signal topic authority and help search engines cluster content around trusted sources. They affect how content is crawled, discovered, and where authority clusters.
From Kathleen Marrero:
These links function somewhere between internal links and traditional external backlinks. They can still help with discovery and provide topical context, but they don’t carry the same authority signal as links between fully independent domains.
Where the concept becomes especially interesting, in my view, is less about backlink swapping and more about discovery pathways.
When writers connect their work through relevant citations, they create routes for both readers and search engines to explore related ideas.
Sprout Social’s Substack SEO guide puts it plainly:
Invest in backlinks through community.
And the reason it works in the first place: Substack itself says the best way to improve your ranking is to get more inbound links, because links signal your publication’s trustworthiness to search engines (Substack Support). Guest posts and cross-shares both count as inbound links by their own definition.
The Ownership Trap
On a yourname.substack.com subdomain, you borrow Substack’s enormous domain authority, which makes it easier to rank than a brand-new personal site.
But the authority you build accrues partly to Substack, not to you. And Substack deliberately doesn’t offer a canonical-source setting the way Medium does, so it stays the primary destination for your writing.
This is exactly why backlink swaps matter more, not less. Every dofollow link another writer points at your work is a vote that lands on your specific posts, building the kind of topical authority a shared subdomain otherwise dilutes.
Link Farms & Penalties
Another thing I needed to dig deeper into was the difference between link farms (excessive link exchanges done purely to manipulate rankings) and natural, relevant link swaps between two quality articles.
What Google penalizes is scale and manipulation:
Automatically injected links with no editorial judgment behind them
Large-scale link schemes across hundreds of unrelated sites
Private Blog Networks (PBNs): fake independent sites secretly owned by the same person, built purely to manufacture links
From Kathleen Marrero:
The difference between manipulative link exchanges and healthy linking behavior comes down to intent and context.
When links are created purely to influence rankings, patterns become easy for search engines to detect.
But when writers reference each other’s work because it genuinely adds perspective or depth to a topic, those links behave more like citations.
They help build a network of related ideas, which is how search engines increasingly understand expertise in the age of entity-based search.
What Google Recommends
Editorial justification: the link helps the reader find something genuinely useful, not just boost a metric
Topical relevance: both articles are about related subjects; links between unrelated sites trigger suspicion
Natural anchor text: varied, descriptive language rather than exact-match commercial keywords repeated every time
Low reciprocal ratio: link exchanges staying well under 10–30% of your total backlink profile look organic; heavy reliance on reciprocal links alone does not
Diverse link profile overall: you also get links from social mentions, podcast notes, editorial citations, and other non-reciprocal sources, so swaps are one signal among many
No patterns or clusters: you’re not linking to the same five sites in every post in an obvious ring structure
From Kathleen Marrero
The bigger shift happening in search is that authority is increasingly determined by how knowledge connects across sources.
When writers link to relevant work from others in their field, they’re not just sharing links; they’re helping build a semantic map of a topic.
Those connections help search engines understand which people and publications are shaping the conversation.
Getting Cited By AI Search
AI answer engines now sit between your post and your reader.
When ChatGPT, Perplexity, or a Google AI Overview answers a question, it cites sources. And Substack is barely in the room.
One GEO analysis of 1.7 million prompts found Substack earned just 1,140 citations, about 0.07% of the total, while Medium pulled more than five times that share.
The problem is built into the platform:
Paywalls stop search engines from reading the full piece.
Each newsletter lives on its own Substack subdomain, so ranking power gets scattered instead of building in one place.
And AI search tends to favour names it already recognises.
The good news: the fixes are not mysterious.
The first systematic GEO study, out of Princeton, found that citing statistics lifted AI visibility by 33%, adding expert quotations by 41%, and citing sources by 28%. Keyword stuffing hurt.
Google’s position is clear enough to annoy every growth hacker: optimizing for its AI features is still just SEO, because those features run on its core ranking systems. It explicitly tells you to skip the gimmicks.
So a backlink swap isn’t only a search-ranking play anymore. A dofollow link from a trusted writer is also a route an AI engine can follow to find, trust, and cite your work.
What Makes LinkSwap Different
What I want is the opposite of link farms:
Human-scale. Few writers, not two thousand bots.
Topic-aligned. You write about the same things your link partner does.
Reader-first. The link goes where your reader would genuinely benefit from going next.
The scale is small and organic: individual writers choosing specific posts to cross-reference.
Why LinkSwap is Free For Premium Members
I don’t want LinkSwap to become a random marketplace where people show up with low-effort content chasing quick SEO wins.
I want to use it as a collaboration engine. A trust-driven network of writers pointing to each other’s best work.
If you’re paying for my work, you probably care about quality, ethics, and long-term thinking. Limiting access to a group with shared values keeps the network clean and useful, instead of racing to the bottom on volume.
In other words, trust is both the foundation and the filter.
That’s why LinkSwap is free for all premium Product with Attitude members.
Premium members get immediate access and a chance to share your work with a community that helps each other grow.
The Experiment We Can Run Together
Start from your readers. What would they genuinely benefit from reading next?
Find writers in adjacent lanes whose work you already respect.
Set up a few intentional swaps over 30, 60, 90 days, and watch how they shape your newsletter growth.
Track what happens: search impressions, new subscribers, engagement. And now, whether you start showing up in AI answers.
But also the softer stuff:
Emails saying I found you through Mr B.
Conversations that only happened because someone clicked that link in the middle of your post.
Try it, and let us know what you discover.
Because the best systems for growth aren’t competitive, they’re collaborative.
Big Thanks To The Beta Team
LinkSwap wouldn’t be half as good as it is today without the generous, detailed feedback from the 22 beta testers.
If you’re building something and want solid, honest, well‑researched feedback, make sure you’re subscribed to:
Dheeraj Sharma, Ileana, Tracy Friedlander, Jenny Ouyang, Joel Salinas, Marcela Distefano, Kacper Wojaczek, Dr Sam Illingworth, Daria Cupareanu, Xian, Dee McCrorey, Karen Spinner, Raghav Mehra, Nirav Bhatt, Tina Nayak, Kim Doyal, Dallas Payne, Jeremy Wright - Marketer/ECHO, Mia Kiraki 🎭 Elena | AI Product Leader, Juan Gonzalez, AI Meets Girlboss.
FAQ
Does SEO work on Substack in 2026?
Yes. Substack pages are server-side rendered with an auto-generated sitemap, and the platform carries very high domain authority, so your posts get crawled and indexed cleanly. What it doesn’t do is build your authority for you, which is where backlinks and structure come in.
Do backlinks work on Substack if everyone shares the same domain?
Yes. Even on a shared domain, links signal topic authority and help search engines cluster your work with trusted sources. They behave somewhere between internal links and full external backlinks, but they still help discovery and topical context.
Are Substack outbound links dofollow or nofollow?
Dofollow by default. Every outbound link in a Substack post passes real link equity, with no nofollow tag to strip the value, which is what makes editorial swaps genuinely valuable.
Should I use a custom domain or stay on a Substack subdomain?
The subdomain borrows Substack’s domain authority and is easier to rank early. A custom domain trades that borrowed authority for long-term ownership and portability. It’s a personal choice, but many writers I talked to benefit from staying on the subdomain until they’ve banked real traction.
How do I get my Substack cited by ChatGPT, Perplexity, and Google AI Overviews?
Make your work crawlable, cite statistics and named experts, structure it cleanly with clear questions and answers, and earn dofollow links from trusted writers. Those are the same moves that help you rank, and the Princeton GEO study found they lift AI citation too.
More Reads About Substack Growth
How I Built Product with Attitude from 0 to Bestseller, without Pretending I Have a Viral Playbook
I Analyzed Every Interaction From My First 6 Months on Substack. Here’s What Drove My Rapid Growth
What’s Your Substack Roadmap for 2026? Mine Comes Straight From 315 Readers.
From The Community
Claire Alvis has kindly featured LinkSwap in her article on influence, identity, and building something that’s actually yours: I’ve been stealing from all of you, and I don’t plan to stop.
Substack Launch Guide: 90 Days of Substack Setup by Katharine Gallagher.
LinkSwap is an amazing extension tool for linking and finding useful references. I used it for one of my articles too. Thank you so much for building it and inviting me to be a beta tester. I look forward to integrate is a part of my publication posting workflow. 🚀✨
This is an absolutely brilliant product, Karo. Thank you so much for building it and also inviting me to be one of the beta testers. I've loved using it, and I'm really excited to keep doing so as part of my Substack workflow.