Ask about the sentence you cannot follow.
Select a passage. Ask about it in the margin. The question stays pinned to those exact words while you read on.
No account, nothing to install. The demo gives you 5 questions on a real paper, and saves nothing.
Memory performance
Recognition lineup test. Responses were coded into one of three possible categories: Correct Identification, False Identification, or No Identification. We predicted that Sleep would show a higher percentage of Correct Identifications but the groups did not differ, χ2(2, N = 88) =.43, p =.81 (Table 1).
Next, we compared confidence using a two factor between-subjects ANOVA with Identification category and Condition as factors. There was a significant effect of Identification category, F(2, 82) = 12.00, MSE = 1.33, p <.001. Post-hoc Tukey tests confirmed that confidence for Correct Identifications was higher than for False Identifications but not higher than No Identifications.
“a two factor between-subjects ANOVA”
What is a between-subjects ANOVA, and what does it tell us here?
A between-subjects ANOVA is a statistical test that compares average scores across groups made of different people, so each participant appears in only one group rather than being measured in every condition. Here, it means the paper is checking whether the outcome differs by Identification category, by Condition, or by the combination of the two, but this passage does not tell us what the outcome was or what the results were.
Ask about this passage Send
The margin
The question goes beside the words it is about.
You hit a clause that assumes a background nobody ever taught you. Select it. A thread opens next to the passage — you ask there, and the answer arrives there, rather than in a separate chat window you keep translating back to the page.
Above the thread you say how much it should read (just your selection, or the whole paper), how much of the field you already know, and whether you want the answer brief or detailed.
Figures, tables, equations
A formula is not text. So you click it instead of selecting it.
A displayed equation does not come out of a PDF as an equation. It comes out as rubble: the limits of a sum landing beside it instead of above and below it, an integrand collapsing into floor brackets. Paste that into a chat window and you get an answer about gibberish.
So Paper Reader finds the figures, tables and equations while it reads the document and marks each with corner brackets. Click one and the question carries the region of the page itself — the formula as printed, the axes and the caption, the whole table with its header row.
It stays put
Come back on Friday. The thread is still on the sentence.
Threads are anchored to the passage, not to a session. Scroll away, close the tab, sign in from another machine: the question is still hanging off the same words with everything you asked underneath it. Ask a follow-up without setting the scene again — the context is what the thread is attached to.
Next, we compared confidence using a two factor between-subjects ANOVA with Identification category and Condition as factors.
2 repliesNext, we compared confidence using a two factor between-subjects ANOVA with Identification category and Condition as factors.
3 repliesHow it works
Three steps, and no setting-up.
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Open a paper
Upload one, paste a link, or start from the open-access papers offered while your library is empty.
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Select what you cannot follow
A sentence, or a figure, a table or an equation by its corner brackets.
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Ask, and read on
The answer lands in the margin beside it, and stays there.
PDFHTMLMarkdown — the three things it reads.
What it costs
Three ways in. One of them never asks you for anything.
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The demo
One real paper and 5 questions about it. No account, no key, no card. Nothing is saved.
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An account
Sign in with Google for ₹30.00 of credit, no card asked for. Top up in small one-off amounts afterwards: no subscription, no auto-renewal. What each answer cost is printed beside it.
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Your own API key
Anthropic or OpenAI. Free and unlimited here — your provider bills you and we charge nothing. The key becomes your identity, so read what a key is and is not first.
The full pricing, and the honest trade-off of using your own key.