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Tech riderRev. 20 Sept 2026

PDFpal

Ch 176.2of 27 AI PDF Assistants
  1. 1Runs onAPI, self-hosted, Web
  2. 2CostsNot stated by the maker
  3. 3Multiple PDFs per chatYes
  4. 4Source citationsYes
  5. 5Access platformsWeb
4 lines stated Written from the maker's own pages: github.com
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The PDFpal homepage

Overview

PDFpal is ranked #17 of 27 in AI PDF assistants on Specifiction. It runs on API, Self-hosted, Web.

Compared on AI PDF assistants

Multiple PDFs per chat
Yesgithub.com
Source citations
Yesgithub.com
Access platforms
Webgithub.com

Facts

Product
PDFpal is a local PDF reader with AI chat, notes, highlights, and a scriptable CLI.github.com · 4 Oct 2026
Reading
The split-pane reader places the PDF beside chat, notes, and related papers, and remembers each source’s last page.github.com · 4 Oct 2026
Chat
Users can ask questions about a passage or across selected sources in a project, with answers grounded in retrieved paper text.github.com · 4 Oct 2026
Organization
Projects organize sources, notes, and chat history, while nested collections organize sources within a project.github.com · 4 Oct 2026
Annotations
Users can save highlights and write Markdown notes at project or source level.github.com · 4 Oct 2026
Paper discovery
Paper search uses OpenAlex, and related-paper discovery uses Semantic Scholar with an OpenAlex fallback.github.com · 4 Oct 2026
PDF sources
The resolver accepts URLs including arXiv, OpenReview, ACL Anthology, PMLR, DOI links, and direct PDF links.github.com · 4 Oct 2026
Automation
The CLI supports JSON output, and the repository provides a Claude Code and Codex skill for agent-driven workflows.github.com · 4 Oct 2026
Integrations
PDFpal supports the Claude, Codex, and OpenCode agent CLIs and uses OpenAlex and Semantic Scholar for discovery.github.com · 4 Oct 2026
Local data
PDFpal stores its database, managed PDF copies, and backups locally under ~/.pdfpal by default.github.com · 4 Oct 2026
Privacy and deployment
The README says the app runs on the user's machine and does not upload PDFs to a cloud service; it is intended for local, single-user operation.github.com · 4 Oct 2026
Requirements
Running PDFpal requires Node.js 22 or newer and an installed, authenticated claude, codex, or opencode CLI.github.com · 4 Oct 2026
Usage limits
The README states there is no SaaS fee, usage cap, or feature gate; AI use goes through the user's existing agent subscription.github.com · 4 Oct 2026

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Where it ranks on Specifiction

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Sources