The short answer: Substack Notes is the better place to grow a newsletter, because every reader there is already on Substack and can subscribe in one tap. Mastodon is a decentralized network with a chronological feed and no ads, good for conversation with niche communities. Post Notes first, then share your best ideas on Mastodon with a link to your Substack.
Based on Substack Help, Mastodon's docs and joinmastodon.org, checked 1 November 2026.
Writers looking for a Twitter alternative often ask the same question: should my short posts go on Substack Notes or Mastodon? Both look like a feed of short posts with replies and boosts, so the comparison feels natural. If you came here from the Twitter side of the question, our Substack Notes vs Twitter guide covers that one.
This page compares the Notes feed with the Mastodon feed, and what each does for your email list. Every platform fact below comes from Substack's or Mastodon's own pages, with the date we checked.
Substack Notes vs Mastodon at a glance
| Substack Notes | Mastodon | |
|---|---|---|
| Who runs it | Substack | Independent servers that federate over ActivityPub |
| Feed order | Home feed mixes follows and the wider Substack network | Chronological home feed of follows and followed hashtags |
| Post length | No published limit | 500 characters by default |
| Links | Link previews in the feed | Every link counts as 23 characters |
| Subscribe path | One tap on a Note | Link click, then signup on your Substack |
| Moderation | Substack's rules | Each server's own rules |
| Scheduling | Native in the Notes composer | Through a scheduling tool such as Buffer |
| Monetization | Paid subscriptions on your publication (writers keep 90%, minus card fees) | None built in |
Sources: Substack Help, substack.com/about, Mastodon docs and joinmastodon.org, checked 1 November 2026.
The biggest row is "Subscribe path." Everything else follows from it. Bluesky sits closer to Mastodon on most of these rows, and our Substack Notes vs Bluesky guide walks through that comparison.
What Substack Notes does for a writer
Notes is Substack's short-form feed. Substack Help says creators can share posts, links, images, quotes and comments there with their subscribers and "the greater Substack network." Notes are public and can appear on the web, in the Substack app and on your Substack profile. To post, like or comment, a reader needs a Substack account and has to be signed in.
Three details matter for a writer:
- Subscribing takes one tap. Substack Help says that if a creator has a publication and you click "subscribe" on their Note, you're subscribed to that publication. Nobody leaves the app or fills in a form.
- The Home feed reaches past your followers. It shows Notes from people a reader subscribes to or follows, Notes from publications their subscriptions recommend, and restacks. A good Note can land in front of someone who has never heard of you.
- Notes don't hit inboxes. Substack Help says subscribers aren't emailed when you post a Note. They may see it in a Notes roundup digest or a push notification.
Scheduling is built in: the calendar icon in the web composer, or the three dots and then "Schedule" in the app. Scheduled Notes wait in your Drafts.
Substack also publishes two growth claims worth knowing. In a July 2024 post on how writers use Notes, Substack says writers who posted three or more thoughtful Notes in their launch week gained 50% more total subscribers than those who didn't. In an October 2024 post, Substack said the app was now the number one source of subscriptions on the platform. Substack doesn't publish a Notes user count. For a full plan, see our guide to growing your Substack with Notes.
What Mastodon does for a writer
Mastodon is a network of independent servers. joinmastodon.org says each server is "a completely independent entity" that can work with the others to form one global social network. Servers talk over ActivityPub, so one account can follow people on any Mastodon server, and on other apps across the fediverse.
For a writer, a few things stand out:
- The feed is chronological. Mastodon says you follow people across any server "and receive their posts in chronological order," with "no algorithms or ads." Its API docs say the home timeline shows posts from accounts and hashtags you follow.
- No ads. Mastodon describes itself as "social networking that's not for sale" and says your feed shouldn't be filled with what a corporation thinks you should see.
- Posts are short. Mastodon's docs put the default limit at 500 characters. Servers can change it. Links count as 23 characters whatever their real length, and in a mention only the username counts toward the limit.
- You control quotes. Mastodon has quote posts (quote controls checked 1 Nov 2026). For every post you choose who can quote it: "Anyone," "Followers only" or "Just me." Posts made in Mastodon 4.4 and earlier aren't quotable unless you change them one by one.
Picking a server is the first real decision. Mastodon's own advice is to join a server whose rules you agree with, or host your own, so read a server's about page before you sign up. Mastodon doesn't publish one network-wide active user count on joinmastodon.org, so we don't quote one here.
Reach and discovery: who sees your post
This is where the two feeds split.
On Substack, a new Note can reach readers who don't follow you yet. The Home feed pulls in Notes from publications a reader's subscriptions recommend, plus restacks from people they follow.
On Mastodon, your post reaches your followers, people who follow a hashtag you used, and anyone who sees a boost. There's no ranking feed, so every post lands in your followers' home feed, in order. Growth beyond them depends on boosts and hashtags.
Tip: on Mastodon, add one or two hashtags your readers actually follow. Mastodon's home timeline includes followed hashtags, so a good tag puts your post in front of people who don't follow you yet.
Neither platform publishes reach numbers we can quote, so judge each one by what it sends to your list.
Links and the path to subscribing
On Notes, the path from post to subscriber is one tap. The reader is already on Substack, already signed in and already sees a subscribe button on your Note.
On Mastodon, the path has more steps:
- A reader sees your post.
- They click the link in the post or the one on your profile.
- They land on your Substack and enter their email to subscribe.
Each step loses some readers. Mastodon makes links cheap at least: a long Substack URL still costs 23 characters, so you keep almost all of your 500 for the idea itself.
Tip: post the full idea on Mastodon and put the link last. A post that gives the reader something complete earns the click better than a teaser. Substack's own guide to bringing a social audience over gives similar advice for Facebook and LinkedIn: share complete thoughts and full explanations over short teasers.
Struggling to stay consistent on Substack?
Batch and queue your Substack Notes in minutes, track which Notes convert subscribers, and grow without burning out.
Who should post where
If newsletter growth is your main goal, put Notes first. Readers there can subscribe in one tap, and Substack says writers who posted three or more thoughtful Notes in launch week gained 50% more total subscribers. Mastodon can wait until Notes is a habit.
If your readers already gather on Mastodon, for example in tech, open source or academic circles, post there too. A server full of people who care about your topic is worth a lot, and the chronological feed means your followers actually see you.
If you want both, treat Notes as home and Mastodon as a second room where you keep the conversation going. The same split works for Meta's network, which we cover in Substack Notes vs Threads.
How to run Substack and Mastodon together
You don't need two separate writing routines. A simple setup:
- Link both ways. Put your Substack URL in your Mastodon profile fields. On Substack, mention where readers can find you on Mastodon.
- Write once, adapt the length. Draft the idea as a Note, then trim it to 500 characters for Mastodon with the link at the end.
- Reply on both. Both feeds are built around replies. A few replies a day keep you visible in each.
- Check what Mastodon sends you. Substack Help says a post's stats show "Popular sites" when readers click through from social media. If your Mastodon server's domain shows up there, it's working.
For Notes alone, the native composer handles timing, and our guide to schedule Substack Notes covers your options.
If you'd like one queue for Mastodon and Substack, Buffer is a friendly pick. Buffer's pricing page lists Mastodon profiles and Substack among its channels, and its Free plan includes 10 scheduled posts per channel (checked 1 November 2026; Buffer says its pricing was last updated in November 2025). Our guide to using Buffer with Substack Notes walks through the setup.
FAQ
Is Mastodon better than Substack for writers?
For growing a paid or free newsletter, Substack Notes usually wins, since readers can subscribe from a Note in one tap. Mastodon suits writers whose readers already gather there, for example tech, open source or academic circles, and who want a chronological feed without ads.
Is Mastodon like Substack Notes?
Both are short-post feeds with replies, boosts or restacks, and quotes. The difference is what sits behind them. Notes lives inside a newsletter platform with subscriptions and payments. Mastodon is a federation of independent servers with no built-in newsletter or paywall.
Does Mastodon have an algorithm?
Mastodon says your home feed shows posts from people and hashtags you follow in chronological order, with no algorithms or ads. Substack's Home feed mixes people you follow with Notes from the wider network, so a new Note can reach readers who don't follow you yet.
Can I post Substack links on Mastodon?
Yes. Mastodon counts every link as 23 characters, so long Substack URLs don't eat your 500 characters. There's no ranking feed to push a link post down. Your post still only reaches followers, hashtag followers and people who see a boost.
What is the character limit on Mastodon vs Substack Notes?
Mastodon's default is 500 characters per post, and server admins can change it. Substack has never published a Notes character limit. Our page on the Substack Notes character limit has the full answer.
Can I cross-post from Substack Notes to Mastodon?
Substack has no built-in Mastodon sharing. Its Help Center has no Mastodon article (checked 1 November 2026), and Substack hasn't announced any Mastodon or fediverse support. Buffer can publish to Mastodon profiles and Substack from one queue. Otherwise, copy the idea and adapt it to 500 characters with a link.
Will Mastodon followers subscribe to my Substack?
Some will, if you give them a reason to click. Put your Substack link in your Mastodon profile and post your best idea in full with the link at the end. Check your post's "Popular sites" traffic source on Substack to see whether Mastodon sends readers.
Should I leave Substack for Mastodon?
Most writers don't need to choose. Substack holds your list, archive and payments. Mastodon is one more place to talk with readers. If moderation or ownership is why you're asking, the table above compares who runs each service and whose rules apply.
The short version
Substack Notes turns attention into subscribers in one tap, and Mastodon gives you a calm, chronological feed with communities that may already care about your topic. Make Notes your home, show up there week after week, and bring your best ideas to Mastodon with a link back. If your readers are colleagues and clients, see Substack Notes vs LinkedIn posts. If you share your work in pictures and video, see Substack vs Instagram. For friends, Pages and Groups, see Substack vs Facebook.
If Notes is your main channel, WriteStack lets you plan and schedule Substack Notes ahead, publishing through Sync plus the Chrome extension. More than 100 Substack bestsellers use WriteStack.
Sources
All checked on 1 November 2026.
- Mastodon docs, Posting to your profile
- Mastodon docs, Quoting other posts
- Mastodon docs, Timelines API
- joinmastodon.org
- Substack, About Substack
- Substack Help, Getting started on Substack Notes, updated 31 October 2026
- Substack Help, What does subscribe on Substack Notes mean?, updated 19 October 2026
- Substack Help, Can I add images, GIFs, or video to a Substack note?, updated 22 October 2026
- Substack Help, Where can I see how readers got to my Substack post?, updated 24 October 2026
- Substack, How writers and creators are using Notes to reach more subscribers, 11 July 2024
- Substack, The Substack app is now the most powerful growth machine for creators, 31 October 2024
- Substack, How to bring your social media audience to Substack, 29 May 2025
- Buffer, Pricing