Two ways to work with PKL, depending on where you start.
One tool for essays you’re about to start. One tool for essays you’ve already written. Same coach, different entry points.
Teaching a class? Head to For teachers →
Essay Workshop
Start before the first draft.
Pick a book from the library. PKL walks you from thesis to draft, one step at a time: Sharpen → Evidence → Outline → Draft.
Sharpen is a five-round dialogue where the coach argues with your thesis. It’s a step you take when you want to test what you’re claiming before you draft it. Evidence is verified against the actual book so you can’t drop a quote that isn’t there. By the time you draft, your argument has already been tested.
Google sign-in creates your account.
Revision Lab
Start with the draft you have.
Paste an essay you already wrote. Any essay: literary analysis, argumentative essay, personal narrative, or personal statement for college applications.
The coach reads the whole draft, flags what’s off one issue at a time, and asks you what you meant. It never rewrites for you. You still do the writing.
Google sign-in creates your account.
Sharpen argues with your thesis before you draft. If you already drafted, Sharpen missed its chance, so the Revision Lab coaches the draft you have.
What Sharpen looks like
Up to five rounds of pushback when you want them.
In Sharpen, the coach argues with your locked thesis from four angles: power, perspective, plain reading, counterargument. You answer with reasoning, not a rewrite. Stop the dialogue whenever you have enough to write with. What follows is one exchange on Jane Eyre.
Jane Eyre · student thesis under pressure
"Jane Eyre becomes independent through her experiences at Lowood, Thornfield, and Moor House."
PKL
01
Plain readingJane refuses Rochester’s proposal after she learns about Bertha, before she has any money of her own. So her independence isn’t from what she inherits. Does "through her experiences" really explain what’s happening?
Student
02
You’re right. Maybe it’s more that she picks independence over comfort. The money just makes it easier to live with the choice later.
PKL
03
CounterargumentA reader could argue the opposite: Brontë builds the plot so Jane doesn’t actually have to choose. The inheritance shows up right when she needs it, and St. John’s proposal gives her one more thing to refuse. What in the text shows Brontë is TESTING Jane’s independence, not protecting her from having to prove it?
Student
04
The refusal comes first though. She left him before she got the money. So it’s not the money making independence possible. It’s her already having it, then getting the resources to keep it.
When you finish Sharpen, PKL writes a summary of what you defended and what still needs work. It follows you into Outline and Draft. The essay you write is the one your thesis actually deserves.
What a Revision Lab flag looks like
One issue at a time. One question at a time.
The coach reads the whole draft, then walks you through what’s off, one flag at a time. Each flag names what you did, asks what you meant, and points at a specific move you can make. It never writes the sentence for you.
Flag type
A big claim from small evidence
Your sentence
"This proves that social media makes teenagers unhappy."
What the coach says
- ·“Proves” means the evidence rules out every other explanation. From one study, it can’t.
- ·One example can support a claim. It can’t rule out every other reading.
- ·Either add the evidence that would make “proves” survive, or swap it for “suggests” / “is consistent with” / “shows one case where.”
What the coach doesn’t say
The new sentence. That’s yours.
One flag shown here. Under the hood, PKL’s catalog covers 51 prose-craft and argument-construction issues across 7 essay genres.
Why it matters
Writing is how you learn to think.
LLMs make it easy to skip that learning, to hand off the thinking before you’ve built the habit of doing it yourself. The people who use LLMs well got there because they already learned the skills they’re now outsourcing. If you don’t build those same skills first, you won’t have that foothold.
PKL is built to protect the habit. It uses AI to help you defend your claims against real pushback, revise until an argument holds, and build the reasoning that writing has always required.
“I write entirely to find out what I’m thinking, what I’m looking at, what I see and what it means.”