Who is Marginalia for?

Inferred · not functionally tested: Marginalia is a consumer product built for students, researchers, and readers of technical books.

Basis unknown · not verified: Yes — there is a free tier, with paid plans for advanced use.

What platforms does Marginalia run on?

Basis unknown · not verified: Marginalia runs on the web.

Is Marginalia still maintained?

Unverified. Marginalia has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What projects are similar to Marginalia?

Similar projects tracked by PulseGate include Suraxa Lite, Britannica Collective for HKPL, and Stealth Novel Reader.

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Marginalia

marginal-ia.appE-book & PDF readers

No liveness check has reached it yet; it has been in the index since 9 Oct 2026. How this is checked

Marginalia is a browser-based PDF and EPUB reader that lets users ask questions about books and receive answers linked to exact passages. It supports phone and desktop reading, text view, English and Spanish interfaces, and local file handling without uploading the book.

Inferred · not functionally tested

FreemiumWebCloud-managed

Visit marginal-ia.app

Overview

6 features

Purpose: Understanding books and locating supporting passages without manually searching or uploading the file.

Inferred · not functionally tested

Audience: students, researchers, and readers of technical books

Inferred · not functionally tested

Functions: rag

Inferred · not functionally tested

Interfaces: API: unknown · MCP: unknown · CLI: unknown · Self-hosting: unknown

Recorded constraints: pricing: freemium · license: Proprietary · platforms: WEB · deployment: browser, cloud_managed

Constraint provenance is unknown; confirm requirements with the publisher.

Record sources: marginal-ia.app. These links do not verify the individual claims.

Marginalia is an E-book & PDF readers project. Inferred · not functionally tested: It focuses on understanding books and locating supporting passages without manually searching or uploading the file. Inferred · not functionally tested: Marginalia is a consumer product aimed at students, researchers, and readers of technical books. Basis unknown · not verified: Marginalia follows a freemium model. Basis unknown · not verified: It ships for the web.

Inferred · not functionally tested: Key capabilities include PDF support, EPUB support, and AI questions. The interface is available in English and Spanish.

Summary written by a language model from the project’s public pages.

Tasks: Inferred · not functionally tested

PDF support
EPUB support
AI questions
Cited passages
Passage navigation
Text view

Topics: Inferred · not functionally tested

Built with & integrations

Framework

Next.js

Hosting

Vercel

Runs on

BrowserCloud-managed

Detected from

Next.js: x-nextjs-prerender header · /_next/static/ in the HTML · __next_f in the HTML
Vercel: x-vercel-id header · x-vercel-cache header

Trust & compliance

Public signals

HTTPSFree tierMulti-language

Indexing history

What PulseGate has recorded for this listing

Indexed9 Oct · 17:51 UTC
Show HN: PDF/ePub reader where you ask AI and each answer links to the passage seen via Hacker News firehose (Algolia)
Source: Hacker News firehose (Algolia) · Open

Frequently asked questions about Marginalia

What does Marginalia do?: Inferred · not functionally tested: Marginalia focuses on understanding books and locating supporting passages without manually searching or uploading the file. It is catalogued under E-book & PDF readers on PulseGate.
Who is Marginalia for?: Inferred · not functionally tested: Marginalia is a consumer product built for students, researchers, and readers of technical books.
Is Marginalia free?: Basis unknown · not verified: Yes — there is a free tier, with paid plans for advanced use.
What platforms does Marginalia run on?: Basis unknown · not verified: Marginalia runs on the web.
Is Marginalia still maintained?: Unverified. Marginalia has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What projects are similar to Marginalia?: Similar projects tracked by PulseGate include Suraxa Lite, Britannica Collective for HKPL, and Stealth Novel Reader.Suraxa Lite Britannica Collective for HKPL Stealth Novel Reader
What languages does Marginalia support?: The interface is available in English and Spanish.

At a glance

Platforms: Web
Languages: English, Spanish
First seen: 9 Oct 2026
Model: B2C
Purpose: Understanding books and locating supporting passages without manually searching or uploading the file.Inferred · not functionally tested
Audience: students, researchers, and readers of technical booksInferred · not functionally tested

Index record

Indexed: 9 Oct 2026
Lifecycle: Unverified
First seen: Oct 2026
Last seen: 9 Oct 2026

Identity audit (11)

Slug: show-hn-pdf-epub-reader-where-you-ask-ai-and-each-answ-marginal-ia-app
Lifecycle state recorded: 9 Oct 2026
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 9 Oct 2026
Timeline basis: Indexed-at chronology (no inferred launch/funding milestones).
Name from: Derived from the project's own page and URL.
Category from: Assigned by a language model.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 9 Oct 2026
Canonical URL: https://marginal-ia.app/en

Cite this record

Marginalia. PulseGate. Record last updated 9 Oct 2026. https://www.pulsegate.ai/apps/show-hn-pdf-epub-reader-where-you-ask-ai-and-each-answ-marginal-ia-app

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