I've been writing on Substack for about six months now, and honestly, the editor is fine for short posts, but once you start pushing longer pieces or trying to optimize for search, it feels limited. That's why I found myself testing Substack against using a dedicated AI writing assistant like Writely. The question really isn't about which platform is better - it's about which workflow actually helps you write more without burning out.
Substack vs. an AI writing tool: where the real difference is
Substack's native editor is minimal. You get bold, italic, links, blockquotes, and not much else. No built-in SEO scoring, no tone suggestions, no structure recommendations. If you're writing a two-paragraph update, that's fine. But most of my readers expect value-packed newsletters, and drafting those from scratch in Substack started to feel repetitive.
Then I tried writing the same pieces in Writely first. I threw in rough bullet points and let the AI expand them into full paragraphs. The difference was immediate. I wasn't staring at a blank Substack compose screen anymore. I was editing drafts that were already 70% complete. And because Writely is designed as an ai seo content generator free (well, it has a free tier - more on that later), I could also check keyword placement before moving anything over.
Realistic scenarios where each approach wins
Take a typical weekly newsletter. If I write directly in Substack, I spend about two hours on a single post - including formatting, re-reading, and fixing flow. With Writely, I can knock the first draft out in thirty minutes. The AI doesn't replace my voice, but it gets the sentences on the page so I can shape them better. That's a concrete time save I can measure.
Now consider someone trying to grow their Substack through search. Substack itself doesn't offer much for SEO - no meta description editor, no heading analysis, no keyword suggestions. But if you draft the piece in an AI-assisted tool, you can optimize the structure before you paste it in. I've been using Writely to check if I'm using the right secondary keywords naturally. For example, I slipped in "best ai writing assistant 2026" in a post about future tools, and it didn't feel forced.
Tradeoffs you need to know about
The biggest friction point: moving content from Writely to Substack isn't seamless. You copy, paste, and sometimes lose formatting. It's a mild annoyance, not a dealbreaker, but it's there. Substack's editor also doesn't support advanced embeds or custom CSS, so anything you prepare in Writely needs to be simple enough to survive plain HTML paste.
Another thing - Writely's AI is good but not perfect. I've had to correct over-formal phrasing and odd metaphors. If you're looking for best free ai writing tool 2026, know that no tool is fully automatic. You still need to edit. What Writely does well is reduce the starting friction. The output is usable, not final.
What about free tools?
There are many options out there claiming to be the best ai writing assistant 2026, but most limit word count or quality on free plans. Writely's free tier is generous enough to test whether this workflow even works for you. If you're on a budget and want an ai seo content generator free, it's worth trying before committing to a paid plan.
My real recommendation
If you're already on Substack and happy with your output, keep going. The platform is great for building an email list, and the simplicity is actually a feature for many writers. But if you find yourself spending too much time on drafting or wondering why your posts don't rank, adding Writely to your process is a low-risk experiment. You don't have to choose one over the other. Write with an AI assistant, then publish on Substack. That head-to-head comparison isn't even close.
I'm still not sure if Substack will ever add native AI features. For now, the smartest move is to use the tool that gets you to "publish" faster without making you hate the writing process. For me, that's been writing in Writely first and treating Substack purely as the distribution layer. It's a small workflow change that made a bigger difference than I expected.
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