The short answer: Grok can draft Substack Notes, and Grok Automations can run a prompt on a schedule. Neither puts Notes onto Substack's schedule by itself: publishing to Substack Notes is not confirmed on xAI's pages. WriteStack is the Notes system around the draft: a weekly queue, Sync through your own browser extension, drafts in your voice, and stats showing which Notes brought subscribers. There is no official WriteStack Grok connector today, so you draft in Grok and move Notes into WriteStack (or Substack) by hand.
Based on xAI's pricing page, X Subscription docs, Grok Automations and Connectors pages, WriteStack docs and Substack Help, checked 5 Nov 2026.
You already use Grok to see what people on X are arguing about today. It turns that into five sharp Notes in a minute. Then the drafts sit in a chat until you paste them into Substack.
So the question is fair: can Grok replace WriteStack for Substack Notes, or could you build your own scheduler with Grok over a weekend? This page answers both, with prices you can check and where a homemade setup tends to break.
We built WriteStack. Every claim about Grok below links to xAI's own pages, so you can check it yourself.
Quick answers
Can Grok schedule Substack Notes? Not on its own. Grok Automations run a prompt once, daily, on weekdays, weekly, monthly or yearly, and report back by email, app notification, both or neither (xAI: Automations in Grok). Substack is not among the connectors xAI lists (Grok Connectors docs), so publishing Notes from an automation is not confirmed on xAI's pages. A scheduled run gives you drafts to copy.
Can Grok replace WriteStack? For drafting and trend research, mostly yes. For the queue, Sync, subscriber attribution and the Activity Center, no.
How much does each cost? Grok now comes with The X Subscription. Premium is $30 a month, or $300 a year, and Plus is $8 a month (xAI pricing, X Subscription pricing docs). WriteStack starts at $19.99 a month billed annually, or $23.99 monthly, with a 7-day free trial (WriteStack pricing).
Can I use them together? Yes, as a drafting plus queue workflow. WriteStack's docs list official setups for Claude, ChatGPT and Notion AI, not Grok (WriteStack docs). Draft in Grok, then paste into WriteStack's queue and click Sync, or paste straight into Substack's own scheduler.
WriteStack vs Grok at a glance
| Grok alone | Grok plus a homemade setup | WriteStack | |
|---|---|---|---|
| Draft Notes | Yes, from your prompt | Yes, from your prompt | Yes, from your own Notes and publication |
| Read what's happening on X today | Yes, live X and web search | Yes, X Search in the API is billed per post | No; WriteStack works from your Substack |
| Hold a Notes queue | No | Whatever you build | Yes, on a weekly posting template |
| Get Notes onto Substack's schedule | Not confirmed on xAI's pages | Paste by hand, drive Substack's UI, or a script you maintain | Sync through the WriteStack browser extension |
| See which Notes brought subscribers | No | Whatever you build | Yes, Notes Performance ranks Notes by free and paid subs |
| Reply to comments and mentions in one feed | No | No | Yes, Activity Center |
| Official WriteStack connection | Not listed in WriteStack docs | Not needed | Claude, ChatGPT and Notion AI on Standard and Enterprise |
| Typical monthly cost | $30 for X Subscription Premium, or $300/year | Premium (or higher), plus API usage, plus your time | From $19.99 billed annually, $23.99 monthly |
Sources: x.ai/pricing, docs.x.ai (X Subscription pricing, Grok Connectors, X Search), x.ai/news/grok-automations, WriteStack pricing and docs, checked 5 Nov 2026.
What Grok is good at for Substack writers
Grok is a strong drafting partner for Notes. Paste in a post and ask for six Notes that pull out its sharpest lines. Ask it to cut a long rant down to a Note that fits on a phone screen.
Its real edge is the news cycle. Grok lives inside X and can search X and the web live, so you can ask what writers in your niche are arguing about this morning and get a Note that joins the conversation while it's still warm. Developers get the same through the X Search tool in the API, which does keyword, semantic and user search on X (xAI X Search docs).
Automations go further than a blank chat. You describe a job once, pick a schedule in your timezone, and Grok runs it as a fresh conversation each time, saving every run to its history (xAI: Automations in Grok). A prompt such as "every Monday at 8:00, find three debates about newsletters on X and draft a Note for each" can leave drafts waiting before your coffee. xAI's July launch post says scheduled automations are available to everyone, while the current pricing page lists "Cloud agents & automations" from Premium up (xAI pricing), so check what your plan shows.
The same subscription covers a lot more than Notes. Premium includes Grok Chat, Voice, Imagine images and video, Grok Build, Cursor and X Premium perks (xAI pricing). If you also grow on X, that bundle matters.
Tip: Give Grok three or four of your best Notes before you ask for anything new. Without real examples, drafts drift toward a generic, X-thread tone that reads oddly on Substack.
What Grok can't do alone
It can't put Notes on Substack's schedule by itself
A Grok automation can run on a schedule and use any connector you mention with @ in its instructions. xAI's built-in connectors cover Gmail, Google Calendar, Google Drive, OneDrive, Outlook, Microsoft Teams, SharePoint and Salesforce, and the catalog adds tools like Notion, GitHub and Canva (Grok Connectors docs). Substack is not on those lists, so posting Notes from Grok is not confirmed on xAI's pages. A recurring automation gives you drafts to copy.
Substack does have its own free scheduler. On the web you click the calendar icon in the Notes composer, pick a date and time, and click Schedule (Substack Help). Grok plus Substack's scheduler is a real, free workflow. You paste and schedule each Note by hand.
It knows X, not your Substack stats
Grok can tell you what's trending on X. It can't see your Substack stats unless you paste them in. It doesn't know which of last week's Notes brought in subscribers and which brought none, so every draft starts from your prompt. You can paste stats into the chat, but you have to collect them first and do it again every week.
It starts from your description of your voice
Custom instructions help. They still start from what you tell Grok about how you write. WriteStack builds a writing style from your publication and studies your Notes from the last 180 days for patterns in openers, length, endings and topics (WriteStack docs). Writing rules get added as you edit, like and skip drafts.
DIY: building a homemade Notes scheduler with Grok
With Grok writing the code, a basic scheduler is within reach for a lot of writers. Tutorials in this space usually fall into three architecture classes:
- Paste into Substack's native scheduler. Grok drafts; you copy each Note into Substack and click Schedule. Free, slow, and reliable.
- Product MCP into a Notes tool. An assistant talks to a product (WriteStack is one) that holds a queue. Grok can add custom MCP connectors (Grok Connectors docs), but WriteStack's public connect docs cover Claude, ChatGPT and Notion AI only. A Grok-to-WriteStack setup is not documented or supported today, so plan on pasting.
- Browser automation or session-cookie scripts. A browser agent, a custom script, or a third-party MCP drives Substack's web app using your login or cookie. Faster to first post. You own security and breakage.
Before you start, here's the honest cost of building, running and keeping a homemade version alive. We haven't put hours on these because they depend on your skills and how much you want it to do.
| Cost | What it looks like |
|---|---|
| Build time | Working out how to post to Substack, store a queue, handle images and run it on a timer. A first version can come together fast. A version you trust with a week of Notes takes longer. |
| Monthly run cost | X Subscription Premium at $30 monthly (or $300/year), plus API usage if your script calls Grok models or X Search. |
| Maintenance | Homemade scripts usually drive Substack's web app. When that app changes, the script can stop working until you fix it. |
| Security | Most homemade setups need your Substack login or session cookie stored somewhere your script or browser tool can reach. |
| Attribution | Still missing unless you also build a way to match new subscribers to individual Notes. |
The money is the small part
xAI's API is cheap for short text. Grok 4.7 lists at $2.00 per million input tokens and $6.00 per million output tokens (xAI models and pricing). Notes are short, so the token bill for drafting a week of them is a small line item. If your script also pulls posts from X, X Search adds $5 per 1,000 posts fetched (xAI X Search docs). The real cost is your time, first to build it and then every time Substack changes something.
An X Subscription covers a lot of drafting and research inside Grok. None of its plans includes a Substack Notes queue, Note-level attribution or an Activity Center (xAI pricing).
Maintenance is the part people underestimate
Your script talks to a website it doesn't control. When Substack changes a page or how sign-in works, posting can fail with no warning. The first sign is often a Note that never went out. If you write for a living, that's an evening of debugging you didn't plan for, and it can come back any month.
Keeping Substack connected safely
Some DIY guides paste a Substack session cookie into a script, a server or a third-party MCP tool. Others let a browser agent click through Substack while you're logged in. A session cookie lets whoever holds it act as you on Substack until it expires. If that cookie sits on a server or in a shared config file, you trust everything that can read it.
WriteStack schedules Notes from your own browser through the WriteStack extension, using the Substack account you're logged in to there. WriteStack's docs say its servers can't do that step for you (Sync docs).
Tip: If you do build your own, keep the cookie on your own machine and never paste it into a shared doc or chat.
Struggling to stay consistent on Substack?
Batch and queue your Substack Notes in minutes, track which Notes convert subscribers, and grow without burning out.
WriteStack and Grok together
You don't have to choose. You can keep Grok for research and drafting and use WriteStack for everything after the draft.
How the workflow works today
WriteStack does not list a Grok connect guide. The public docs cover Connect Claude, Connect ChatGPT and Connect Notion. So the Grok path looks like this:
- Draft Notes in Grok (or set an automation that leaves drafts waiting each week).
- Paste each Note into WriteStack, mark it Ready, and drop it on your weekly template.
- Open WriteStack on your computer, go to My Notes → Scheduled notes, and click Sync N scheduled notes to Substack.
Notes wait in WriteStack until you Sync them from a computer with the extension installed and Substack logged in. Once synced, Substack holds the scheduled Note and publishes it at its time (Sync docs).
If you also use ChatGPT or Claude, connect those to WriteStack on Standard or Enterprise and queue from the chat while Grok stays your research and drafting surface. More background: our Substack MCP server guide and the AI assistants hub.
What you get that Grok can't give you
Open Notes Performance on a Monday and sort by Free Subs. The Note you almost didn't post is at the top (WriteStack docs). Ask Grok what's being debated on X this week, write five more Notes in that winning pattern, paste them into WriteStack, and clear a week of comments and mentions from the Activity Center. If you're on Standard, send each Note to X, LinkedIn or Threads through your Buffer account (cross-posting docs). Buffer is a friendly partner here, and it closes the loop for writers who grow on X too.
The part people don't expect: WriteStack can repost evergreen Notes every 1 to 4 weeks and restack your own Note hours after it goes out.
Pricing snapshot (checked 5 Nov 2026)
| Plan | Price | What it covers for Notes |
|---|---|---|
| X Subscription Free | $0 | Limited Grok chat |
| X Subscription Plus | $8/month, or $80/year | Grok Chat, Voice, Imagine and Build, Grok API access, X Premium checkmark |
| X Subscription Premium | $30/month, or $300/year | 4x Plus usage, latest Grok models, cloud agents and automations, X Premium+ perks |
| X Subscription Super | $100/month, or $1,000/year | 15x Plus usage, priority access at peak times |
| X Subscription Ultra | $200/month, or $2,000/year | 50x Plus usage |
| xAI API | Pay per token, plus per-post X Search | Only if you build your own tool |
| WriteStack Hobbyist | $19.99/month billed annually ($239.88/year), or $23.99 monthly | Queue of 20 Notes, AI drafts in your voice, the Coach |
| WriteStack Standard | $24.99/month billed annually ($299.88/year), or $32.99 monthly | Queue of 100, MCP for ChatGPT and Claude, Activity Center, subscriber attribution, Buffer cross-posting |
| WriteStack Enterprise | $79.99/month billed annually ($959.88/year), or $99.99 monthly | Unlimited queue and AI credits, advanced Notes search |
Sources: xAI pricing, X Subscription pricing docs, Automations in Grok, xAI models and pricing, WriteStack pricing, WriteStack plans and limits. US list prices before tax. SuperGrok is no longer sold to new customers; existing SuperGrok and X Premium plans continue at their old prices unless you switch. Every WriteStack plan has a 7-day free trial and can be canceled anytime.
X Subscription Premium costs about $6 more a month than WriteStack Hobbyist billed monthly. Premium buys Grok, Cursor and X perks. WriteStack buys the Notes queue, Sync, voice and attribution.
Who should pick which
Stick with Grok and Substack's own scheduler if you post a few Notes a week, don't mind pasting each one, and don't need to know which Notes bring subscribers.
Build your own if you enjoy the project, are comfortable keeping a Substack login secure, and accept that you'll fix it when Substack changes.
Use WriteStack, with Grok for research and drafting, if Notes are a growth channel for you. You get a weekly queue, drafts in your voice, one feed for replies, and a clear view of which Notes turned readers into subscribers.
FAQ
Can Grok post Notes to Substack directly?
Not confirmed on xAI's pages. Grok Automations can draft on a schedule, but Substack is not among the connectors xAI lists. Paste into Substack's scheduler, or paste into WriteStack and click Sync.
Is WriteStack's AI just Grok?
WriteStack drafts from a writing style built from your publication and your recent Notes, and it updates as you edit and react to drafts.
Does WriteStack have a Grok connector?
Not in the public docs today. Official connect guides exist for Claude, ChatGPT and Notion AI. With Grok, draft in the chat and move Notes into WriteStack by hand.
Does Sync publish Notes for me automatically from the cloud?
No. Publishing goes through Sync: open WriteStack on a computer with the extension installed and Substack logged in, then click the yellow Sync button. Once synced, Substack publishes each Note at its time.
Is it cheaper to build my own scheduler with Grok?
The subscription and API bill can be lower. The cost moves to your time: you build it, keep your Substack login secure, and fix the script when Substack changes.
The short version
Grok is a strong place to research and draft Substack Notes, especially when a Note reacts to what's happening on X today, and Automations make recurring draft batches easy. WriteStack is where those Notes get queued, synced through your own browser, written in your voice and measured by the subscribers they bring. Use both if you like Grok, and let WriteStack handle everything after the draft. See WriteStack plans and the 7-day free trial.
Also compare: WriteStack vs AI assistants: all comparisons · WriteStack vs ChatGPT for Substack Notes · WriteStack vs Claude for Substack Notes · WriteStack vs Gemini for Substack Notes · How to schedule Substack Notes with ChatGPT · How to schedule Substack Notes with Claude · Substack MCP server guide · Best Substack scheduling tools
Sources
All checked on 5 Nov 2026.
- xAI, Pricing: compare plans
- xAI docs, The X Subscription pricing
- xAI, Automations in Grok
- xAI docs, Grok Connectors
- xAI docs, X Search tool
- xAI docs, Models and pricing
- Substack Help, Getting started on Substack Notes
- WriteStack, Pricing
- WriteStack docs, Connect Claude
- WriteStack docs, Connect ChatGPT
- WriteStack docs, Connect Notion
- WriteStack docs, Sync
- WriteStack docs, Plans and limits
- WriteStack docs, Writing style
- WriteStack docs, Find your best Notes
- WriteStack docs, Activity Center
- WriteStack docs, Cross-posting with Buffer