StackContacts Studio · version 1.39

Your readers, buyers and community, connected.

Substack shows which Notes and posts brought subscribers. Studio connects everything else: each person across Substack, Gumroad, Kit and Skool with their whole history, whether the subscribers each source brings actually read or pay, and which links bring sales. It copies what you use (Medium and systeme.io too) into one database on your own computer, so you know who to talk to and what to write next. Ask Claude about any of it in plain English, and nothing goes out until you say yes.

★★★★★ 5.0 from 10 ratings · Mac and Windows · 30-day money back if it won't set up
Claude Desktop · StackContacts Studio
Which of my subscribers are also my best customers, and what do they read?
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41 subscribers have bought from you on Gumroad, and 12 of them twice or more. Most found you through recommendations, and they open your step-by-step guides far more than your opinion pieces.

Nine of them haven't heard from you in three months. Want me to draft a short check-in for each? I'll show you every one before anything is sent.

An illustration with made-up numbers.

Years of writing on Medium?

Bring your Medium archive with you

If you've written on Medium for years, that archive is worth more than a link in your bio. Allow Medium on Studio's Data sources page, and Studio brings in every story you wrote, its stats and earnings day by day, and the passages your readers highlighted, with how many marked each one.

On Insights → Medium, pick a story and who it's for (readers of your posts on that topic, your most engaged readers, your buyers). Claude proposes new angles, writes the one you pick, and saves it as a Substack draft for you to finish. Or turn it into Notes. The highlights show you which lines landed.

Read only: Studio never changes anything on Medium. New to Substack but have a Medium archive? That archive is your data, so Studio is a good fit already.

Insights, Medium: your stories, reads and earnings, the topics that worked, and month by month
Questions you can finally answer

Ask Claude in plain English, or open the page that already shows it.

Which of my Notes actually bring in subscribers?
Which of my Medium stories should become a Substack post, and for which of my readers?
Who bought from me on Gumroad but doesn't read my newsletter?
Which of my subscribers have bought something, and which never have?
Which new Skool members are already subscribers or buyers?
Who's on my Kit list but not on Substack, and do my Kit tags match who actually reads?
Which of my social posts in Buffer or Blotato brought readers to which article?
Who used to talk with me every week and went quiet?
How it works

Sync. See. Act.

1

Sync

Studio's Chrome extension reads Substack and the platforms you connect through your own logins and keys, and copies them into one database on your computer, now or every day. You choose which publications and parts it keeps.

2

See

Studio's pages show who's waiting on you, who to thank, who you lost, who's drifting, and which Notes turn into subscribers, with the reason next to each person.

3

Act

Mark what needs a reply and ask Claude to work through it. It drafts each one, shows you the preview, and sends only after your yes.

What's inside

Pages that tell you what to do next

Today

Replies, comments and DMs waiting on you, on Substack and Skool, oldest, newest or most valuable first. Five people to talk to today, and why. Everyone new this week: who subscribed, joined your Skool community, or joined your Kit or systeme.io list. Someone who joined in two places is shown once.

Studio's Today page: Follow up, with readers' names blurred
Your personal CRM

Subscribers: everyone, and how you know them

Everyone on your list, with their stage: Reading, Talking, Close or Drifting. Click someone and their whole relationship with you is there at once:

  • How you know them: whether you follow each other, their comments, your DMs, what they bought on Gumroad, their Kit tags, and when you last talked.
  • Also known as: the same person on Skool or under another email, linked for you to confirm.
  • Who they are: their public Substack profile and how they compare with your other subscribers.
  • Don't contact: one click, and Studio and Claude leave them out of follow-ups.

Thanks & losses shows who recommended you, restacked you, bought or went paid and hasn't heard from you since, and who left, starting with people you knew.

My own Subscribers page. Names, emails and profiles are hidden.

Studio's Subscribers page with one subscriber open: stage, how you know them, other accounts, their Substack profile. Names and emails hidden

Customers: everyone who bought, subscribed or not

Every Gumroad buyer, including the many who never subscribed to your Substack. Filter by product, paid or free, date, refunds, and whether they said yes to your emails, and see at a glance who you could invite to your publication.

Click a customer for everything they bought and when, what they've spent, whether they subscribe, and their other accounts, with a link straight to your DMs. It's the history a good CRM keeps, built from data you already have and kept on your own computer.

My own Customers page. Names and emails are hidden.

Studio's Customers page with one customer open: spend, products, email permission, other accounts and everything they bought. Names and emails hidden

Collaborations: start with the writers who already know you

Substack's Creator matches show the writers whose readers overlap yours most. Studio adds what you already share with each one: whether they subscribe to you or recommend you, have bought from you, are on your Kit list or in your Skool, how often you've written to each other, and whether you follow or recommend them.

Warmest first puts the writers you already know ahead of strangers with a bigger overlap. Someone who reads you and buys from you is an easier ask. Open in Claude starts the conversation: Claude reads what you share with that writer and drafts the pitch for you to edit.

My own Collaborations page. Writers' names, publications and bios are hidden.

Studio's Collaborations page: Creator matches as cards with shared subscribers, new readers for each side, and what you already share, warmest first. Names and bios hidden

Insights

The Notes and posts that bring in subscribers, signups by source as Substack counts them, and who each source brings: whether those subscribers read, only open, or pay, and how long they take to pay. Then Notes by tag, your Medium stories and what readers highlighted, which links and posts bring in sales, and your Skool community over time.

Insights, Conversion: who each source brings

Your Notes, sorted for you

Studio puts every Note into one of five kinds, using cut-offs from your own Notes, and tells you what to do with each:

  • Reach and subscribers: repeat the format, or turn it into a post.
  • Reach, no subscribers: ask for the subscription next time.
  • Small but converting: restack or reshare it.
  • Small, got replies: conversation starters.
  • Quiet: rework it or let it go.

The Map shows every Note as a dot: how many new people it reached (followers and people not yet connected to you, never your own subscribers) against the subscribers it brought. Click a dot to open the Note. The When tab shows whether the day and time you post make a difference, and says so plainly when they don't.

My own Notes, all 2,404 of them. Your map will look different.

Insights, Notes: five kinds of Notes with their counts, and the Map plotting every Note by new people reached and subscribers brought

Schedule and your weekly plan

Your scheduled Notes and posts as a list or a calendar. Drag a Note to another day or hour, with 5 seconds to undo. Tell Claude how you post (a slot at 9:00, three Opinions a week): it tags your Notes, shows what's empty up to 92 days ahead, and fills gaps from your drafts.

The Schedule page's calendar: posted Notes with a check, scheduled ones still to come

Give your best work a second life

Posts sorts your newsletters into five kinds, like your Notes: which reached people who don't subscribe, which brought subscribers, and what to do with each.

Reuse lists your posts at least 30 days old that brought subscribers or Gumroad sales, or reached many people who don't subscribe, and that you haven't turned into Notes yet. The ones that brought the most subscribers or sales come first. Open in Claude writes Notes from one, or a new post.

Trends shows your posts quarter by quarter: signups per 1,000 views and open rate, output and reach, the Gumroad sales that probably came from each quarter's post links, and your posts next to your Notes. When both slow down together, it's your audience that changed, not one format.

From Medium, pick a story and who it's for (readers of your posts on that topic, your most engaged readers, your buyers): Claude proposes new angles, writes the one you pick and saves it as a Substack draft for you to finish.

My own Posts page.

Insights, Posts: five kinds of posts, and the Reuse tab listing proven posts not yet turned into Notes, each with Open in Claude

Home, and Claude's tools

Your own board of routines (Morning, a launch week with a countdown) with ready-made prompts you open straight in Claude Desktop. In Claude: schedule Notes and posts, send DMs, answer comments, post and reply on Skool, build your Skool courses, and ask questions about all of it.

Studio's Home: today at a glance and a morning routine of prompts
Works with the platforms you already use

Every platform you add answers a new question

Your readers, buyers and community are often the same people. Studio starts with Substack alone and gets more useful with each place you connect. Connect only what you use, and leave out the rest.

Substack

Who's behind every number?

Which Notes and posts bring subscribers, who's waiting on your reply, who to thank, and who left.

Reads subscribers, Notes, posts and their text, tags, comments, DMs, recommendations and growth sources.

Medium

What in your archive still works?

The stories and passages your readers responded to, ready to become Notes and new posts.

Reads your stories, their stats and earnings, and readers' highlights. Read only.

Gumroad

Which readers buy, and what made them?

Which subscribers are also customers, which links brought the sale, and who took something free and is due a friendly follow-up.

Reads sales, products and email workflows. Read only.

Kit

Is your email list the same people?

Which Kit subscribers also read you on Substack, and which haven't found your publication yet. New subscribers join your welcome list on Today.

Reads subscribers, tags, forms, sequences and broadcasts. Read only.

systeme.io

Are your students also your readers?

Which of your contacts subscribe on Substack, which course students are paid subscribers, and how your newsletters and automation emails did. New contacts join your welcome list on Today.

Reads contacts and tags, courses and enrollments, communities, products and price plans, and email stats. Read only.

Skool

Who in your community also reads and buys?

Match members to subscribers and customers. Claude can post, reply and build your courses with you, after you approve each one.

Reads posts, comments, members and analytics.

Buffer, Blotato, Eden, Notion, Dub

Is your other work paying off?

Which social posts brought readers to which article, what's queued in your drafts pipeline, and which short link brought the click and the sale.

Reads what's queued and what went out. Read only.

Why it's safe

Your data, your logins and your yes stay with you.

Studio is a Chrome extension and an extension in Claude Desktop, paired with each other on your computer. There's no StackContacts server holding your list.

  • Your data stays on your computer. Error reports and which features you use go to PostHog so I can help when you write in, never your content, and you can turn them off on the About page.
  • Your logins stay in your browser. Studio never reads, copies or stores them.
  • Nothing goes out without your yes. Anything that posts, sends or deletes shows you a preview first. Only Substack and Skool can be written to; Medium and every platform you connect with a key are read-only, and Studio refuses an Eden, Notion or Dub key that could write.
  • You choose what's kept. Leave a publication out of the sync, or remove what Studio stored for one in two clicks.
From Gumroad

What buyers say

★★★★★
“Studio is everything I’ve ever dreamed of, but something I could never have managed to create on my own. Now, Claude is not just an assistant—he’s a true partner. … Your content will no longer hold any secrets from you!”
Amara Lane
★★★★★
“…this is by far the most comprehensive and best product if you are serious about Substack. While this is AI-driven, I still maintain complete control over my writing. This provides stats, recommendations, and organizational suggestions for improvement.”
Penguin Printables
★★★★★
“Substack in one corner, Gumroad in another, Buffer sulking in a third. This tool puts the lot in one place… If you're not using it, you're leaving thousands of dollars on the table. I know, because I left them there for months.”
TOGT The Old Grey Thinker
★★★★★
“Amazing, I've been looking for a tool like this for years, Data is everything and this allows you to access and act on all the data you can't usually see.”
Mark Thompson
★★★★★
“Once again you have exceeded expectations Finn. Love this new version!”
Strategic Friction

10 ratings on Gumroad, all five stars. Read every review on Gumroad

Who it's for

Studio works on your own readers and writing

A good fit if

  • You've published on Substack for a few months and have some subscribers and Notes.
  • You have a Medium archive you'd like to put to work.
  • Your readers, buyers or community are in more than one place.

Better to wait if

  • You're just starting and haven't published yet. Studio shows what works in your data, so there's little to show at first.
  • Come back after your first few months of posts. In the meantime, Finn'sights Lab is free and a good place to start.
One price
$99 once

Includes 12 months of updates and email support. Studio keeps working after that; renewing for new versions will be optional. Fixes when Substack or a platform you connect changes something are included for as long as I sell Studio.

Set it up, or your money back. If within 30 days Studio can't sync your publication or connect to Claude Desktop on your computer after you follow the install guide, email your receipt for a full refund.

Already use the StackContacts app? Studio imports the history it built up, one click per publication. Want help asking good questions? Add the Studio Question Pack ($5, 75 questions).

Questions

Before you buy

What do I need?

A Mac with Apple Silicon (M1 or later), or a PC with Windows 11 (64-bit); your purchase includes a download for each. Chrome, Brave, Edge or Arc, signed in to Substack. And Claude Desktop; a paid Claude plan is recommended. Nothing else to install: Studio brings its own Node.js. Intel Macs aren't supported yet.

Will it help if I'm just starting out?

Only a little, at first. Studio shows what works in your own posts, Notes, readers and sales, so it needs some of those to show you anything. If you're new to Substack but have a Medium archive, that archive is your data. Otherwise, come back after a few months of writing.

Does it work with only Substack?

Yes. Substack is the heart of Studio, and every other platform is optional. It shines when your people are in more than one place.

Will it post or send anything on its own?

No. Anything that posts, sends or deletes shows you a preview first, and nothing happens until you approve it. The one shortcut is on Studio's own Schedule page: when you drag a scheduled Note to a new time yourself, it moves after 5 seconds unless you press Undo.

Does Studio see my Substack password or cookies?

No. Studio works through your own signed-in browser, which attaches your login the way it does when you use Substack yourself. Studio never reads, copies or stores it.

What does Claude see?

Your data stays in a database on your computer. When you ask Claude a question, it reads the parts it needs through Studio's tools, and those parts become part of your Claude conversation, like anything else you share in a chat.

How do updates work?

Download the new zip from your Gumroad library, ask Claude “Update Studio”, and click Install. The Chrome extension follows by itself. Updates come often, and most start as a message from someone using Studio.

I run several publications. Does that cost more?

No. Studio syncs every publication your Substack account runs that you choose to include, and you can leave any of them out.

What if I get stuck?

Email me at finntropy@gmail.com; I answer myself. Studio's Troubleshooting page and its setup skill for Claude cover the common snags, and Finn'sights Lab is where other Studio users share how they use it.

Know who to talk to next, and why.

One extra sale to a reader who already likes you covers most of it.