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Both tools schedule Substack Notes and show you what's working. The critical difference is account safety: StackSweller connects with your Substack session cookie, and Substack's Terms of Use ban letting someone else log in as you. WriteStack publishes through Sync and your own Chrome extension, with deeper analytics and engagement features. Here's the full picture.
WriteStack and StackSweller both let you schedule Substack Notes, analyze performance, and generate Notes with AI. The critical difference is how they publish. WriteStack publishes through its own Sync and the Chrome extension in your browser session, with no cookie stored on our servers. StackSweller's docs say it connects using your Substack session cookie (substack.sid) and publishes from its servers. This page breaks down everything else too.
StackSweller suits writers who want one flat-price plan with unlimited Notes and are comfortable giving it their Substack session cookie. WriteStack suits writers who want Notes publishing through Sync and their own Chrome extension, plus engagement tools and deeper stats (Standard plan and up).
Competitor details and prices checked 20 Oct 2026 from their public pages.
StackSweller has a simple setup: you can paste your Substack session cookie or let its optional extension pick it up, and it publishes from its own servers. Its one Pro plan includes unlimited scheduled Notes and AI credits for $39 a month or $250 a year.
The core scheduling features are solid: a content calendar, a posting heatmap, bulk scheduling, reposting winners, and analytics that show which Notes drive subscribers.
Scroll through the table. Column headers stay pinned so you always know which product is which.
| Feature | WriteStackToS-safe | StackSweller⚠ Cookie risk |
|---|---|---|
| ⚠ Account Safety | ||
| Publishes through Sync and your own Chrome extension | Yes | NoStackSweller connects with your Substack session cookie (substack.sid) and publishes from its servers |
| Never asks for your Substack password | Yes | YesStackSweller docs: "We never need your Substack email or password." |
| Your Substack session stays in your browser | Yes | NoStackSweller docs: connecting gives it "a live login" to the account |
| Scheduling | ||
| Schedule Substack Notes | Yes | Yes |
| Visual posting calendar | Yes | YesWeekly content calendar |
| Heatmap of posting habits | Yes | YesPublishing activity heatmap |
| Bulk-schedule Notes | Yes (queue holds 20, 100 or unlimited Notes by plan) | Yes (up to a hundred at once, unlimited queue) |
| Personalized optimal time suggestions | Yes | Not listed |
| Configurable time slots | Yes | Yes |
| Reschedule & reorder queue | Yes | Yes |
| Repost top-performing notes / evergreen | Yes | Yes |
| Works without a browser extension | No | YesPaste the cookie, or let its optional extension pick it up |
| AI & Content Creation | ||
| AI Note generation in your voice | Yes | Yes |
| Generate Notes from articles & files | Yes | Yes |
| Tone-matched rewrites & variations | Yes | YesRespin and variations |
| AI chat with your Substack context | Yes | Via its MCP on higher plans |
| Built-in web research | Yes | Not listed |
| Analytics | ||
| Notes performance dashboard | Standard plan and up | Yes |
| Subscriber conversion tracking per Note | Standard plan and up | Yes |
| Format & timing breakdown | Standard plan and up | Not listed |
| Growth correlation graphs | Standard plan and up | Not listed |
| Engagement & Community | ||
| Unified Activity Center (notifications) | Standard plan and up | Not listed |
| Keyboard shortcuts for replies | Standard plan and up | Not listed |
| Auto-like on reply | Standard plan and up | Not listed |
| Search millions of Notes in your niche | Enterprise plan | Not listed |
| Follow & curate a creator listNEW | Yes (10, 20 or 80 creators by plan) | Not listed |
| Personalized Following feedNEW | Yes | Not listed |
| Engage directly from your Following feedNEW | Yes | Not listed |
| Cross-platform posting | ||
| Cross-platform posting | Standard plan and up (via Buffer) | Not listed |
| Power Users & Teams | ||
| Multiple client seats / ghostwriter mode | Yes | NoOne Substack account per StackSweller account; publications must share one Substack username; no multi-client dashboard yet |
| Works on any browser / device for planning | Yes | Yes |
| Chrome extension for publishing | Yes | Optional, used to pick up your cookie |
| Pricing (checked 20 Oct 2026) | ||
| Monthly price | $23.99, $32.99 or $99.99 a month (Hobbyist, Standard, Enterprise), or $19.99, $24.99 or $79.99 a month billed yearly | Pro $39 a month or $250 a year |
| Free plan or trial | 7-day free trial on every plan, no free plan | 7-day free trial |
Prices checked 20 Oct 2026. "Not listed" means we could not find the feature on the competitor's public pages that day.
Ready to see it in action?
Start your free 7-day trial →StackSweller publishes Notes from its servers on your behalf. Its docs say: “StackSweller connects using your Substack session cookie (substack.sid)” and “Connecting gives StackSweller a live login to the client's account.” A third-party server holding a live login to your account is the access Substack's Terms of Use rule out:
“You also agree that you will not contribute any Post or otherwise use Substack in a manner that:
...
- • Jeopardizes the security of your Substack account or anyone else's (such as allowing someone else to log into Substack as you, or sharing your account or password with someone)
...”
Giving StackSweller your session cookie lets its server act as you on Substack, which is what this clause covers. Your account is the one at risk.
WriteStack publishes through Sync and the Chrome extension in your own browser. We never ask for your password or session cookie, and your credentials never leave your browser.
Sync + extension publishing
Notes publish from your browser session via Sync, with no cookie harvest on our servers
No credential exposure
Your session cookies stay in your browser, always
No password handover
WriteStack never asks for your Substack password or session cookie
Beyond account safety, these are the features that make the biggest difference for writers serious about Substack growth.
WriteStack publishes through Sync and the Chrome extension in your own browser session, and Sync runs automatically. We never ask for your Substack password or session cookie. StackSweller's docs say it connects with your Substack session cookie and that connecting gives it a live login to your account.
Both tools show which Notes drive subscribers. On the Standard plan and up, WriteStack adds format breakdowns, timing analysis and growth correlation graphs so you know exactly what to repeat.
Generate Notes from your past content, articles, or files, with rewrites, variations, and an AI chat that understands your full Substack context.
The Activity Center (Standard plan and up) replaces Substack's chaotic notification feed. Reply with keyboard shortcuts. Auto-like on reply. We could not find engagement tools on StackSweller's site.
Build a curated list of creators you want to engage with and read their Notes in a single feed, directly inside WriteStack. We could not find a similar feature on StackSweller's site.
Write and schedule Notes for multiple clients from one account. StackSweller's docs say each account connects to one Substack account and there is no shared multi-client dashboard yet.
Ready to see it in action?
Get started free →Real writers. Real publications. You can look them up.
"My new subscribers growth rate doubled ever since. It saves me hours of posting manually."
Yana G.Y.
Unplugged by Yana G.Y.
"The Notes analytics alone are a game-changer — actual data showing which posts convert to subscribers."
Dino | The Art of Purpose
masterclass247.com
Common questions about WriteStack and StackSweller
See how WriteStack stacks up against other tools
StackSweller is a capable scheduling tool that works through your Substack session cookie, which Substack's Terms of Use rule out. WriteStack publishes through Sync and your own Chrome extension, and adds a Following feed, Notes research, and deeper stats and the Activity Center on the Standard plan and up.
Schedule Notes with Sync + the Chrome extension, track what converts, follow creators you care about, and generate content in your voice. Free for 7 days.