substack.com llms.txt
In short
substack.com serves a 19 KB llms.txt with 10 H2 sections and 72 links, graded A on the llmstxt.org structure (6 of 6 checks). It passes every check. The home page does not link it, so an agent that does not guess paths will not find it. An llms-full.txt is served too. Read 4 November 2026.
llms.txt 19 KB, 125 lines
# Substack
> Substack is a media platform where writers, podcasters, video creators, and media companies build independent businesses around their work. Publish, grow an audience, connect with subscribers, and get paid directly[…]all in one place.
Substack combines publishing tools with a network that helps people discover your work through recommendations, Notes, collaborations, and the Substack app. You own your content and subscriber list, choose what to publish, and decide which work is free or paid.
Substack is free to start, with no monthly platform subscription fee. When you enable paid subscriptions, you keep 90% of subscription revenue, minus payment-processing fees.
## When to use Substack
- Start a publication and deliver writing to subscribers by email, on the web, and in the Substack app. [Get started](https://substack.com/get-started.md)
- Host a podcast, distribute episodes to listening apps, and build a community with a companion newsletter and paid subscriptions. [Podcasting](https://substack.com/podcasts.md)
- Publish videos, offer paid exclusives, and connect with subscribers through live video. [Video](https://substack.com/video.md)
- Grow an audience through recommendations, Notes, referrals, collaborations, and discovery in the Substack network. [Growth tools](https://substack.com/growthfeatures.md)
- Build direct relationships with subscribers through comments, Chat, and community discussions. [Features](https://substack.com/features.md)
- Earn directly from your audience with paid subscriptions, choosing which work to make free and which to reserve for paying subscribers. [Going paid](https://substack.com/going-paid.md)
- Run a media business with multiple contributors, newsletters, podcasts, and subscriber communities. [Media founders](https://substack.com/startups.md)
- Bring an existing publication, subscriber list, or podcast to Substack. [Switch to Substack](https://substack.com/switch.md)
- Read, watch, and listen to creators, discover new voices, and participate in their communities. [Substack app](https://substack.com/app.md)
## How agents should use this site
- Use the grouped directory below to find the relevant product, use-case, guide, or comparison page.
- Read the linked Markdown page for detailed capabilities, requirements, pricing, and qualifications.
- When explaining subscription economics, distinguish Substack’s platform fee from payment-processing fees. [Paid subscriptions](https://substack.com/going-paid.md)
- When comparing platforms, preserve the conditions and limitations in the comparison rather than relying on a headline alone.
- For setup instructions and troubleshooting, consult the [Substack Help Center](https://support.substack.com/).
## How to read this site as a machine
The marketing pages in the directory below have plain Markdown versions.
Append `.md` to an indexed page’s URL. For example:
`https://substack.com/podcasts` → `https://substack.com/podcasts.md`.
These Markdown versions preserve substantive page content while removing
navigation, forms, decorative elements, and JavaScript. They are generated
from the corresponding marketing pages and updated with changes to those pages.
Use this file to select individual pages to read. For the complete collection
in one document, use [llms-full.txt](https://substack.com/llms-full.txt).
This directory covers Substack’s own marketing pages. It is not an index of
individual creators’ publications, posts, or subscriber-only content.
## Overview
- [About Substack](https://substack.com/about.md): Learn how Substack supports paid publishing with its revenue model, audience network, multimedia and community tools, legal support, and examples of creators and publications.
- [Substack features](https://substack.com/features.md): Explore Substack’s publishing, newsletter, podcast, video, discovery, payment, customization, and migration features, plus pricing, data ownership, mobile apps, and creator-support FAQs.
## Getting started
- [Distribute your podcast on Substack](https://substack.com/distribute-podcasts-to-substack.md): Learn how to distribute an existing podcast on Substack without changing hosts, RSS feeds, or ads, including setup, automatic syncing, archive imports, and subscriber community features.
- [How to start a Substack](https://substack.com/get-started.md): Learn the basics of starting a Substack, preparing your publication, announcing its launch, and exploring tools for audience growth and paid subscriptions.
- [Move from Ghost to Substack](https://substack.com/ghost.md): Learn about moving from Ghost to Substack, including importing content and payments, pricing, audience growth, subscriber ownership, and support for posts, podcasts, video, and community.
- [Paid subscriptions](https://substack.com/going-paid.md): Learn how Substack paid subscriptions work, what creators keep after fees, how subscriptions compare with advertising, and examples of creator earnings and audience growth.
- [Guide to going paid](https://substack.com/going-paid-guide.md): Learn how to plan, launch, and grow a paid Substack publication, including goal-setting, publication strategy, design, free audience growth, and subscriber conversion benchmarks.
- [Switch to Substack](https://substack.com/switch.md): Learn which platforms Substack supports for imports, how switching works, its ownership and paid-publishing benefits, and examples of writers who moved their publications.
First 57 of 125 lines. 2 spans shown as […] because the words or characters in them are rejected by this site's own style rules; the live file has them.
Parse graded A, 6 of 6
file: https://substack.com/llms.txt
Substack
Substack is a media platform where writers, podcasters, video creators, and media companies build independent businesses around their work. Publish, grow an audience, connect with subscribers, and get paid directly[…]all in one place.
10 sections, 72 links, no Optional section.
Ora's cached score: 55, grade C, scanned 8 October 2026.
The parse
substack.com lists 72 links: 72 point at substack.com or a relative path, 0 point elsewhere. The hosts it links most: substack.com (71), support.substack.com (1).
| H2 section | Links |
|---|---|
| When to use Substack | 9 |
| How agents should use this site | 2 |
| How to read this site as a machine | 1 |
| Overview | 2 |
| Getting started | 6 |
| Publishing and growth | 5 |
| Who Substack is for | 7 |
| Podcasting guides | 18 |
| Comparisons | 17 |
| Resources | 5 |
Grade against the llmstxt.org structure
The file passes all six checks. The grade is the count of passed checks: six is A, five is B, four is C, three is D, fewer is F. It measures structure only. Whether any agent reads the file is a separate question, covered on the llms.txt reference.
| Check | Result | Detail |
|---|---|---|
| Starts with an H1 naming the site or project | Pass | H1: Substack |
| Has a blockquote summary under the H1 | Pass | Blockquote summary found. |
| Has at least one H2 section that lists links | Pass | 10 H2 sections, 10 with links. |
| At least 80 percent of links point at the same site | Pass | 72 of 72 links stay on substack.com (100 percent). |
| Under 100 KB | Pass | 18944 bytes as served. |
| Plain markdown, no HTML | Pass | No HTML document markers in the body. |
Ora's cached score
Ora's cached report for substack.com gives it 55 of 100, grade C, scanned on 8 October 2026. Its Access layer, which holds the read-layer checks below, scored 26 of 57 check points. Read from GET ora.ai/api/score/substack.com on 5 November 2026. The score is Ora's, not this site's, and the structure grade above is a different measure: it grades the llms.txt file against the llmstxt.org proposal, while Ora's score covers the whole site. Ora's report for substack.com has every layer.
| Ora check (Access layer) | Result | Points |
|---|---|---|
| Sitemap exists | Pass | 2 of 2 |
| Content without JavaScript | Partial | 1 of 3 |
| Not blocked by bot detection | Pass | 2 of 2 |
| Markdown URL fallback | Fail | 0 of 2 |
| llms.txt exists | Fail | 0 of 1 |
| llms.txt formatting | Fail | 0 of 2 |
| JSON-LD structured data | Fail | 0 of 4 |
| Metadata completeness | Pass | 2 of 2 |
| llms.txt links resolve | Not applicable | 0 of 2 |
| Markdown alternate link | Fail | 0 of 1 |
| Redirect hygiene | Pass | 1 of 1 |
| Page token budget | Pass | 1 of 1 |
| Code fence validity | Not applicable | 0 of 1 |
| Content behind auth | Pass | 2 of 2 |
| OpenAPI spec published | Fail | 0 of 7 |
| Markdown agent docs | Fail | 0 of 1 |
| Markdown negotiation with Vary | Fail | 0 of 1 |
| Markdown for agent user agents | Fail | 0 of 1 |
| Agent crawler reachability | Pass | 2 of 2 |
Linking and the companion file
The home page of substack.com does not link the file in its HTML. Ora's lab found (2026-10-19) that 86 percent of llms.txt fetches by agents arrived through a link, so an unlinked file is mostly a file nobody opens. An llms-full.txt is served at the same root.
How it compares
At 19 KB the file is larger than 76 percent of the 2,529 plain-text llms.txt files in this edition, and its 72 links put it ahead of 72 percent of them on link count. The home page declares no generator. Size bucket: 10 to 50 KB. Tranco rank 427. Category: Communication & Support.
Live file: https://substack.com/llms.txt. Read 4 November 2026. If the file has since changed or gone, the live URL is the authority; this page records what the crawl read on that date.
Sources
- substack.com llms.txt https://substack.com/llms.txt, read 4 November 2026
- llms.txt proposal (llmstxt.org) https://llmstxt.org/, read 4 November 2026
- Tranco list 746WX (crawl universe) https://tranco-list.eu/list/746WX, read 4 November 2026
- Ora: AgentReady launch post (the 86 percent finding) https://ora.ai/blog/agentready-launch, read 4 November 2026
- Ora llms.txt (GET /api/score/{domain} looks up a cached score) https://ora.ai/llms.txt, read 5 November 2026
Last reviewed 5 November 2026