Drill
Built for dense reading

Drill into confusing text
without leaving the page.

Highlight a phrase, get an inline explanation, and keep drilling into follow-up concepts while the original context stays attached.

Try the live demoSee the reading loop
Why dense reading breaks
Preview step 1/3

Why dense reading breaks

A paragraph is easiest to understand when the explanation still belongs to it.

The moment a technical sentence pushes you into another tab, you pay a . Drill keeps the explanation in the passage so the thread can grow into a instead of a pile of searches.

  • The explanation opens below the exact line that stopped you.
  • Each answer can become the next question when you need more detail.
  • Zoom out without guessing where the original sentence lives.
Click a highlighted term to start →
This preview shows a short branch. In the product, drill trees are recursive and are not capped at three levels.

Why reading breaks

Search breaks the thread. Drill keeps it attached.

Without Drill

  • Leave the paragraph to search a term.
  • Copy context into a chat window.
  • Return and reconstruct the argument.
  • Follow-up questions scatter across tabs and chats.
  • The reading path disappears after the session.

With Drill

  • Ask from the sentence that stopped you.
  • See the explanation inline, below the source text.
  • Drill into the explanation without restarting context.
  • Keep parent, current node, and child drills connected.
  • Return to saved branches when you review.

How it works

The reading loop

1

Get stuck on a phrase

Dense docs and papers often fail one phrase at a time, not one article at a time.

2

Highlight and drill

Select the exact words that blocked you. Drill inserts the explanation inline, below the source sentence.

3

Keep the thread

Drill again from the answer, move back to the parent, or save the branch for review.

Built to keep the reading thread intact

1
click
From highlight to inline explanation
0
tab switches
To ask a follow-up inside the text
3
levels
Parent, current node, and next drills in view
1
thread
For the whole reading path

Start free, pay when you read more

Try the full highlight → drill → review workflow with trial credits and a daily allowance. Upgrade only when Drill becomes part of your reading routine.

Start Free
Free
Try the full workflow with trial credits and daily free use
$
0
.
0
0
/month
  • 15000 trial credits
  • 3000 daily free credits
  • No artificial depth cap
  • Community support
Most Popular
Starter
For people regularly studying dense technical material
$
9
.
9
9
/month
  • 500000 credits / month
  • Knowledge tree history
  • Email support
High Volume
Pro
For heavy research and professional reading workflows
$
2
9
.
9
9
/month
  • 2000000 credits / month
  • Priority AI processing
  • Priority email support
  • Early access to new features

Paid plan credits renew monthly. Purchase extra credits anytime. See terms.

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Frequently asked