Both tools schedule Substack Notes and show you what's working. But one of them requires access to your Substack cookies — which violates Substack's Terms of Service and can get your account suspended. 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 uses Substack's native scheduling — safe, ToS-compliant, zero account risk. StackSweller publishes by accessing your Substack session cookies, which violates Substack's Terms of Service and can lead to account suspension. This page breaks down everything else too.
WriteStack
31/32
features
StackSweller
11/32
features
StackSweller does have one genuine UX advantage: it's fully cloud-based, so there's no Chrome extension to install and no laptop to keep on. Notes publish even while your computer is off. For writers who want truly hands-off scheduling, that's a real convenience.
The core scheduling features are solid, and their analytics show which Notes drive subscribers. If you're willing to look past the account safety concern, the product works.
Scroll through the table — column headers stay pinned so you always know which product is which.
| Feature | WriteStackToS-safe | StackSweller⚠ Cookie risk |
|---|---|---|
| ⚠ Account Safety | ||
| Uses Substack's native scheduling (ToS compliant) | StackSweller requires access to your Substack cookies — a direct violation of Substack's Terms of Service | |
| No cookie access required | StackSweller stores your session cookies server-side to publish on your behalf | |
| Zero account suspension risk | Substack actively enforces against third-party cookie access | |
| Scheduling | ||
| Schedule Substack Notes | ||
| Visual posting calendar | ||
| Heatmap of posting habits | ||
| Bulk-schedule 100+ Notes at once | ||
| Personalized optimal time suggestions | StackSweller uses fixed slots — not personalized to your audience | |
| Configurable time slots | ||
| Reschedule & reorder queue | ||
| Repost top-performing notes / evergreen | ||
| No Chrome extension / no laptop required | ||
| AI & Content Creation | ||
| AI Note generation in your voice | ||
| Generate Notes from articles & files | ||
| Tone-matched rewrites & variations | ||
| AI chat with your Substack context | ||
| Built-in web research | ||
| Analytics | ||
| Notes performance dashboard | ||
| Subscriber conversion tracking per Note | ||
| Format & timing breakdown | ||
| Growth correlation graphs | ||
| Engagement & Community | ||
| Unified Activity Center (notifications) | ||
| Keyboard shortcuts for replies | ||
| Auto-like on reply | ||
| Search millions of Notes in your niche | ||
| Follow & curate a creator listNEW | ||
| Personalized Following feedNEW | ||
| Engage directly from your Following feedNEW | ||
| Power Users & Teams | ||
| Multiple client seats / ghostwriter mode | StackSweller is single-publication only | |
| Works on any browser / device for planning | ||
| Chrome extension for publishing | ||
| Privacy-first local publishing | ||
Ready to see it in action?
Start your free 7-day trial →StackSweller is cloud-based — meaning it publishes Notes from their servers on your behalf. To do that without a Chrome extension, it needs access to your Substack session cookies. Handing those over means a third-party server is impersonating you on Substack. That is a direct violation of Substack's Terms of Service, and Substack actively enforces against it. Writers have had accounts suspended for exactly this.
“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)
...“
By giving StackSweller your Substack cookies, you are essentially giving your account password to a third-party server. This is a direct violation of Substack's Terms of Service and can get your account suspended.
WriteStack uses Substack's native scheduling. No cookies, no session tokens, no third-party server acting as you. Your credentials never leave your browser.
Native scheduling
WriteStack uses Substack's own scheduling infrastructure
No credential exposure
Your session cookies stay in your browser — always
Zero ToS risk
WriteStack has never caused a Substack account suspension
Beyond account safety, these are the features that make the biggest difference for writers serious about Substack growth.
WriteStack uses Substack's native scheduling — no cookies, no session tokens, no ToS violations. StackSweller requires access to your Substack cookies, which violates Substack's Terms of Service and puts your account at real risk of suspension.
Both tools show which Notes drive subscribers. WriteStack goes further — 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. StackSweller's AI is limited to post-to-notes conversion.
The Activity Center replaces Substack's chaotic notification feed. Reply with keyboard shortcuts. Auto-like on reply. Clear your inbox in 15 minutes instead of 90. StackSweller has no engagement tools.
Build a curated list of creators you want to engage with and read their Notes in a single feed — directly inside WriteStack. StackSweller has no equivalent feature.
Write and schedule Notes for multiple clients from one account. StackSweller supports only a single publication per account.
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.
"It's a great product and easy to use. Right now it's the only Substack scheduler there is."
Tim Denning
Unfiltered
"The Notes analytics alone are a game-changer — actual data showing which posts convert to subscribers."
Dino | The Art of Purpose
masterclass247.com
StackSweller is a capable scheduling tool — until you realize it works by accessing your Substack cookies, which violates Substack's Terms of Service. WriteStack does everything StackSweller does, goes deeper on analytics, AI, and engagement — and does it without putting your account at risk. For anyone building something real on Substack, that's not a close call.
Schedule Notes using Substack's native infrastructure, track what converts, follow creators you care about, and generate content in your voice — free for 7 days.