ShakespeareAI vs Sudowrite vs Squibler: I Wrote the Same Book on All Three

I had a dumb idea on a Tuesday night in January.

What if I took the exact same book concept — same genre, same premise, same characters — and wrote it on three different AI book-writing platforms? Not a vague comparison based on feature lists. An actual, controlled experiment where the only variable is the tool.

So that's what I did. I spent three weeks and roughly 60 hours writing the same fantasy novel on ShakespeareAI, Sudowrite, and Squibler. Same prompt. Same expectations. Wildly different results.

The Three Contenders

ShakespeareAI — Free tier (2 books/month, 50 pages). Paid from ~$15/month. Specifically designed for full book generation.

Sudowrite — $19/month (Hobby), $29/month (Professional), $69/month (Max). The "premium" name in AI fiction writing.

Squibler — $16/month (Basic), $36/month (Pro). Positions itself as an all-in-one book writing suite.

I paid $19 for Sudowrite and $16 for Squibler. ShakespeareAI was free. That's already a data point, but let's keep going.

Round 1: Onboarding & Setup

ShakespeareAI

Signed up in 45 seconds. The dashboard is minimal — big "Create New Book" button and that's about it. I clicked Create, selected Fantasy, pasted my concept, and the AI generated a full outline in about 3 minutes. I tweaked a few things and was ready to generate.

Setup time: ~20 minutes

Sudowrite

Account creation was straightforward. The dashboard is more complex — document editor, Story Engine panel, Brainstorm tools. It feels like a writing IDE. Setting up the novel required writing "beat sheets" for each chapter manually. More control, but more upfront work.

Setup time: ~45 minutes

Squibler

The onboarding included a 12-step tooltip tutorial that popped up over my content. The interface has a lot going on — panels, sidebars, floating toolbars. I accidentally created two duplicate projects and had to delete one.

Setup time: ~40 minutes (plus frustration)

Round 1 Winner: ShakespeareAI — fastest to first chapter, simplest setup.

Round 2: Outline Quality

ShakespeareAI

Solid. Each chapter summary was 60-80 words, hit key plot points, and the overall arc made narrative sense. The AI correctly identified that my "cursed cartographer" story needed a mystery element. One issue: it suggested a romantic subplot I didn't ask for (it wasn't bad, but I removed it).

Sudowrite

Doesn't generate outlines the same way — you create beat sheets with AI assistance. The brainstorm suggestions were more literary and nuanced. One suggestion for Chapter 9: "Mira realizes that the erased towns aren't gone — they're trapped inside the ink of her maps, and she can hear them if she listens." That's actually really good. I used it.

Squibler

Functional but generic. Summaries like "Mira discovers the truth about her powers" without specifying what that truth is. I rewrote 60% of the outline manually.

Round 2: Tie — ShakespeareAI (speed + quality) and Sudowrite (nuance + creativity)

Round 3: Prose Quality

This is the one everyone cares about. I gave all three the same Chapter 1 setup: Mira in her workshop, finishing a map of a coastal town, noticing buildings are missing, and her ink moves on its own.

ShakespeareAI's Chapter 1 (excerpt)

The candle had burned down to a stub by the time Mira noticed the discrepancy. She'd been inking the coastline of Pellworth for three hours, cross-referencing her field sketches with the council's survey records, and her eyes were doing that thing where the lines started swimming if she looked too long.

But this wasn't her eyes.

The harbor was wrong. Not wrong like she'd made a mistake — she didn't make mistakes, not with maps, not anymore — but wrong like someone had moved the buildings.

Mira set down her pen. Picked it back up. Set it down again.

"That's new," she said to no one.

Analysis: Conversational, good pacing, decent character voice. The "set down her pen, picked it back up" beat feels human.

Sudowrite's Chapter 1 (excerpt)

The map was lying.

Mira knew this the way a carpenter knows when wood is warped — not through measurement, but through the wrongness of it against her fingertips. She had surveyed Pellworth herself, walked its streets with her brass compass and her leather case of instruments, recorded every alley and archway with the precision that had made her the youngest licensed cartographer in the Guild's history.

Pellworth had a fishmarket on Anchor Street. She had sketched it on Tuesday. But the map beneath her hands showed only emptiness where the fishmarket should be.

Not a blank space. Not an error. Emptiness, the kind that felt intentional.

Analysis: More polished, more literary. The carpenter metaphor is elegant. This reads like a published fantasy novel.

Squibler's Chapter 1 (excerpt)

Mira was working late in her workshop when she noticed something strange about the map she was drawing. The coastal town of Pellworth, which she had carefully surveyed just last week, looked different on the parchment. Some buildings seemed to be missing from the harbor area.

She leaned closer to the map, squinting in the candlelight. The fishmarket on Anchor Street — she was sure it had been there when she visited. But on the map, that area was blank.

Analysis: Flat. Reads like a summary rather than a chapter. No voice, no personality, no rhythm.

Round 3 Winner: Sudowrite — best prose quality, with ShakespeareAI a solid second.

Round 4: Full Book Generation

ShakespeareAI

15 chapters in about 4.5 hours. 48,000 words. Characters stayed consistent. The mystery built appropriately. Chapters 7-9 sagged a bit, but the climax was strong. The AI didn't forget the plot.

Sudowrite

Chapter by chapter, 15-20 minutes each. About 8 hours total (spread over several days). Better consistency because you review each chapter before the next generates. But I burned through my Hobby plan and had to upgrade to Professional ($29/month). That stung.

Squibler

Inconsistent generation times (5-20 minutes per chapter with no clear reason). By Chapter 6, the AI lost track of subplots. The editor crashed twice, losing progress once. A random new character appeared in Chapter 12 that wasn't in my outline.

Round 4 Winner: ShakespeareAI — for efficiency. Sudowrite for quality control.

Round 5: Editing Required

Round 5 Winner: Sudowrite — less editing needed overall.

Round 6: Pricing

*Had to upgrade from Hobby ($19) to Professional ($29) mid-project.

Sudowrite is $19/month. ShakespeareAI is free. That's kind of the whole argument.

Is Sudowrite's prose better? Yes, by maybe 15-20%. Is it $29/month better? For me — someone who's published 3 novels and made $347 total — absolutely not.

Round 6 Winner: ShakespeareAI — not even close.

Round 7: Features

The Final Verdict

Choose ShakespeareAI if:

• You're a first-time author or hobbyist
• Budget is a factor (it's free)
• You want the fastest path from idea to complete book
• You're writing for Amazon KDP or personal projects
• You value simplicity and speed over maximum prose quality

Choose Sudowrite if:

• You're a serious/professional fiction author
• Prose quality is your top priority
• You don't mind a slower, more hands-on workflow
• You can justify $19-69/month from your book revenue

Choose Squibler if:

Honestly? I'd try the other two first. Squibler isn't bad, but it didn't do anything better than either ShakespeareAI or Sudowrite in my testing. The interface needs work, the AI output was the weakest, and the pricing sits awkwardly between free and premium.

My personal pick?

I'm sticking with ShakespeareAI for my next novel. The quality gap between it and Sudowrite exists but isn't large enough to justify $29/month when I'm making $347 total from three books.

But right now? Free wins. And it wins by a lot.

Frequently Asked Questions

Is ShakespeareAI really free?

Yes. The free tier gives you 2 books per month with up to 50 pages each. No credit card required, no trial expiration. I wrote my entire test novel on the free tier.

Is Sudowrite worth $19/month?

If you're making money from fiction writing and prose quality is your differentiator, yes. If you're a hobby writer or just starting out, probably not. The free alternatives have gotten surprisingly good.

Which tool is best for beginners?

ShakespeareAI. Simplest interface, generates complete books with the least manual work, and being free means zero risk.

Can I switch between tools?

Yes. All three let you export your work. I've exported from ShakespeareAI as EPUB and imported into Scrivener for final editing.

Which tool produces the most publishable output?

Sudowrite produces the best raw prose. But "publishable" depends on your editing. I published novels written on ShakespeareAI — they just needed more editing to reach the same quality level.

Last updated: February 28, 2026. I paid for my own Sudowrite and Squibler subscriptions — this review is not sponsored.