How paperful compares

A plain-language map of where paperful sits next to Zotero plugins, bibliography fixers, Mendeley export cleaners, and DOI-centric download scripts.

Last reviewed: 2026-09-24. Feature lists for other products are based on public docs and positioning — not paid pilots or exhaustive release testing.

Vendor-by-vendor notes live in the comparison reference. Prefer this page for “is this the right tool?”

Short answer

If you need…	Look at…
A platform-agnostic mirror of the library (backup, and a way out if the citation manager changes). Zotero is well tested. Mendeley and EndNote adapters are seeking testers	paperful snapshot / restore — quiet mirror. Do not treat the other adapters as proven
Bulk missing-PDF fetch for a Zotero library (OA → campus proxy → optional Sci-Hub), collection-shaped folders, resumable CLI	paperful (this repo)
In-Zotero “find OA PDF” plus optional grey-zone sources in one plugin UI	zotero-zotadata
Attachment hygiene (broken links, rename, stored-to-linked, duplicate files on one parent)	paperful attachments (report by default; surgery with a flag and --apply). In-app: StorScan, Attanger, ZotMoov
Metadata repair (DOI/ISBN/arXiv bulk update, parent-from-PDF)	paperful lint / fix-metadata, or ZotMeta
Duplicate parents in one collection (DOI, then title+year). Review a pack, then merge the PDF, notes, and better fields onto one item.	paperful dedupe
Grey literature landings (UN, FAO, ISA, and similar) kept as real PDFs	paperful playbooks in direct / landing. Journal-style OA fetch is the row above
Batch notes from PDFs you already have: one grounded summary per item, then a collection review. Local model, off by default. Scans need ocr first	paperful summarize / synthesize
Scriptable library surgery (merge, enrich, disk GC, two-up scan split) via CLI/MCP	zotero-agent
AI assistant read/write over the library, including chat and (on some forks) OCR of scans	zotero-mcp forks (richardjlyon, cookjohn, mcp-zotero)
.bib normalize / dedupe / upgrade preprints (no Zotero required)	bibcite, bibtex-tidy, bibmanager
Mendeley dedup inside the app; clean exported BibTeX	Mendeley Duplicates smart collection; export cleaners such as mendeley_bibtex_cleaner
DOI-list PDF batch without Zotero	paperscraper
Grow the library from a keyword, a DOI’s references, an ORCID, or a hybrid hop, then optionally fill PDFs. Re-check later with watch (baseline once, then propose new arrivals on disk; you schedule watch run)	paperful snowball — dry-run, approve-each, approve-batch, --gate auto, --fetch-pdfs, and watch (snowball). In-app one-hop browsers stay separate (zotero-snowball, Citegeist). General harvesters without the mirror: findpapers, opencite
“Just use what ships in Zotero”	Built-in Find Available PDF plus custom PDF resolvers

paperful does not replace a full metadata editor, an in-app attachment reorganiser, or a .bib linter. attachments reports layout problems and, with a flag plus --apply, repairs them from out/. Incoming downloads, author folders, and tablet send/get stay with Attanger and ZotMoov. The jobs are library, find, completeness, mirror, and control. Fetch and lint run on disk; the manager is a write-back adapter (manager = "zotero" is well tested; Mendeley and EndNote are seeking testers).

Architecture: architecture.md.

Where paperful sits

Most tools in this space optimise one or more of:

1. Acquire PDFs — open access, proxy, optional Sci-Hub, Scholar

2. Fix metadata — DOI discovery, Crossref/OpenAlex fills

3. Fix files — rename, linked paths, broken attachments, duplicate PDFs

4. Fix .bib / exports — keys, duplicates, Mendeley-specific fields

5. Automate / agent — MCP, CLI, batch undo

Those map onto paperful’s jobs. Find is (1): open access, campus proxy, playbooks, and an opt-in AI browser after the scripted lanes fail. Completeness is (2) (lint / fix-metadata, patches on disk, --apply to the adapter) plus duplicate review (dedupe) and opt-in summarize / synthesize. Mirror is the portable disk copy (snapshot / restore; snapshot --pdfs all also copies PDFs already in Zotero). (3) is paperful attachments: a report by default, and --fix-broken, --merge-files, --rename, or --link only with --apply. (4) is other tools. (5) is partial here: the same opt-in summaries, plus one-item recover. A chat agent stays with zotero-mcp. Scanned PDFs get a text layer from paperful ocr; two-up split and shrink stay with zotero-agent pdf-prep. Library is the catalogue you already have, grown with snowball when you ask. Control is disk-first write-back and opt-in sources.

Reference library  →  paperful snapshot  →  out/<collection>/<stem -- KEY>/
                 →  paperful run       →  same folder (PDF)  →  attach (Zotero 10+)
                 →  paperful restore --apply  →  missing items only
                      ↑
        OA / CORE / arXiv / EZProxy / Scholar / htmlpdf / grey playbooks / (opt-in Sci-Hub)

Optional, off until [llm].enabled (needs a text layer; `paperful ocr` adds one):
  summarize · synthesize · recover (browser agent; last run lane after vault browsers fail)

Parallel tracks:
  Metadata: paperful lint/fix-metadata, ZotMeta, zotero-agent
  Duplicates: paperful dedupe (merge onto the keeper, then trash the extra), Zotero’s duplicate UI, zotero-agent
  Attachments: paperful attachments (CLI). In-app: StorScan, Attanger, ZotMoov
  Chat: zotero-mcp. Two-up scan split: zotero-agent pdf-prep
  Text layer for image PDFs: paperful ocr
  Bib CLI (bibcite, bibtex-tidy)

Capability snapshot

Legend: Yes = first-class · Partial = adjacent or lighter · No = absent or out of scope.

Capability	paperful	Zotero built-in	zotero-zotadata	StorScan	ZotMeta	zotero-agent
Bulk fetch missing PDFs	Yes	Partial	Yes	Partial	No	Partial
Collection-scoped batch runs	Yes	No	Partial	Partial	Partial	Yes
Resumable manifest / retry	Yes	No	Partial	Partial	Partial	Partial
Open-access source stack	Yes	Partial	Yes	Partial	No	Partial
Campus EZProxy (cookie session)	Yes	No	No	No	No	No
Sci-Hub (explicit opt-in)	Yes	Partial	Yes	No	No	Partial
Metadata verify / lint	Yes	No	Yes	No	Yes	Yes
Metadata apply to library	Yes (fix-metadata --apply)	No	Yes	No	Yes	Yes
Broken link / file layout repair	Partial (attachments; report by default, surgery with --apply)	Partial	Partial	Yes	No	Partial
Dedupe / merge items	Yes (dedupe --apply merges children and better fields, then trashes the extra; Zotero only)	Partial	No	Partial	No	Yes
Runs outside Zotero UI (CLI)	Yes	No	No	No	No	Yes
Work on disk, then write-back	Yes	No	No	Partial	No	Partial
Per-item folder you can restore from	Yes (snapshot / restore; does not overwrite fields)	No	No	No	No	No
Copy PDFs already in Zotero onto disk	Partial (snapshot --pdfs all)	Partial (File → Export PDFs)	No	No	No	No
Grey-literature landing playbooks	Yes	No	No	No	No	No
Grounded summary / collection review	Partial (opt-in, local, text layer)	No	No	No	No	Partial (public README: summarize PDFs into notes)
OCR for scanned PDFs	Partial (ocr, OCRmyPDF text layer on disk)	No	No	No	No	Partial (pdf-prep, OCRmyPDF)

zotero-mcp and BibTeX-cluster columns: comparison reference.

What paperful does not do today

• Mendeley and EndNote adapters exist and are seeking testers. Zotero is the well-tested path. EndNote writes are an import bundle (File → Import); paperful does not edit the .enl database

• Author-folder layouts, incoming-download matching, and tablet send/get (attachments --link can point a personal library at out/; it is off unless you pass it)

• Mendeley and EndNote item merge (dedupe --apply is Zotero-only)

• Two-up scan split, or a chat agent over the library (ocr adds a text layer; it does not split pages. summarize / synthesize / recover are opt-in and local)

• Hosted multi-user service

• Jeffersonian transcription or qualitative coding

Choosing in one glance

Have Zotero, many items without PDFs, want a resumable CLI + folder tree?
  → paperful

Want the files and records on disk, independent of Zotero cloud quota?
  → paperful snapshot (restore recreates only missing items)

Want grounded notes, then one review of a collection, without a chat session?
  → paperful summarize, then synthesize (local model; text-layer PDFs)

Library DOI looks wrong but you already have the PDF?
  → paperful lint, then fix-metadata --apply

Want the same job but stay inside Zotero with one plugin?
  → zotero-zotadata (review legal/ToS for its extra sources)

Library is messy on disk (broken links, dup PDFs on one item, filenames)?
  → paperful attachments (report). Add --fix-broken, --merge-files, --rename, or --link with --apply to write.
  Author folders, incoming downloads, tablet send/get → StorScan, Attanger, ZotMoov

Only a .bib from Mendeley/Zotero export?
  → bibcite / bibtex-tidy / JabRef

Want a new collection from a keyword, a paper’s bibliography, someone’s ORCID, or one hop from the top hits?
  → paperful snowball (see snowball.md). One-shot PDF fill is --fetch-pdfs with --gate auto

Want new works matching a saved snowball profile, without a discovery daemon?
  → paperful snowball watch (baseline once, then propose; schedule watch run yourself)

Just a list of DOIs, no Zotero?
  → paperscraper

Scanned PDFs with no text layer?
  → paperful ocr (disk text layer). Two-up books: zotero-agent pdf-prep

Want a chat agent in the loop?
  → a zotero-mcp fork

More branches: comparison reference. How far a snowball hop reaches: How a hop is cut.

Related docs

• architecture.md — disk-first adapters, circuit breaker, Sci-Hub

• ROADMAP.md — mirror contract toward 1.0; optional LLM; snowball phases

• snowball.md — keyword, DOI, ORCID, collection, and hybrid library building

• comparison-reference.md — vendor notes and extra tables

• commands.md — CLI and disk artifacts

• config.md — config.toml and operations