Scholar Sidekick
citation verifier for the "real DOI, wrong paper"
Last verified:
What is Scholar Sidekick?
Citation Verifier (Scholar Sidekick) is a web tool that checks whether individual scholarly citations and identifiers actually resolve to real records and whether the resolved metadata matches the citation text provided. It accepts DOIs, PMIDs, PMCIDs, arXiv IDs, ADS bibcodes, ISBNs, ISSNs, and pasted reference lines, resolving identifiers against CrossRef, PubMed/Europe PMC, OpenAlex/Semantic Scholar, and other authoritative sources to detect fabricated DOIs or invented titles. The tool compares the resolved title and authorship to the cited string and flags common fabrication patterns (for example, a valid DOI with a made-up title), then returns corrected, normalized metadata and properly formatted citations in thousands of CSL styles. It is designed for quick, one-off verification and integration into AI workflows (REST API and MCP server) rather than as a full reference manager, targeting researchers, editors, students, and AI developers who need to verify citation authenticity rapidly.
Scholar Sidekick pricing
Pricing model: Freemium
The web Citation Verifier is free to use without an account for interactive checks, with anonymous access and a generous anonymous tier; there is a free public REST API for light use, and an optional BASIC RapidAPI key provides a larger monthly quota and higher rate limits for programmatic access. Exports and formatting features are included in the free web and API tiers; paid or higher-quota plans are only needed for sustained high-volume or enterprise integration.
Scholar Sidekick pros
- Accepts a wide range of identifier types (DOI, PMID, PMCID, arXiv, ADS, ISBN, ISSN)
- Detects mismatch between resolved metadata and cited title to flag invented titles
- Resolves identifiers against multiple authoritative databases for robust verification
- Free to use on the web with anonymous access and no signup required
- No rate limit at the anonymous tier for interactive web use
- Provides corrected, normalized metadata when mismatches are found
- Exports verified citations in thousands of CSL styles including APA and Vancouver
- Supports export formats for reference managers (BibTeX, RIS, EndNote, CSL JSON)
- Offers a public REST API for programmatic verification and formatting
- Provides an MCP server implementation for embedding in AI assistants and tools
- Healer for minor typos in pasted DOIs or identifiers to improve match rates
- HTML output can render citations as footnotes for easier copy-paste into documents
- Clear per-citation status reporting (resolved, unresolved, mismatched)
- Designed specifically to catch AI-hallucinated references and fabricated DOIs
- Open-source friendly and documented API with usage examples and endpoints
Scholar Sidekick cons
- Not a full reference manager—no long-term library management features
- Relies on external data sources, so rare database gaps can cause unresolved items
- Does not replace deep bibliographic research or access to subscription-only content
- Some identifier types (e.g., ISBN via OpenLibrary) may fallback and be less complete
- Edge cases with ambiguous citations may require manual review
- Doesn't attempt to find alternative sources when a citation truly does not exist
- Automated detection focuses on dominant fabrication patterns and may miss novel ones
- API higher-rate tiers require signing up for RapidAPI/BASIC quota for heavier use
Frequently asked questions about Scholar Sidekick
What identifier formats does Citation Verifier accept?
Citation Verifier accepts DOIs (including doi.org links), PMIDs, PMCIDs (which auto-map when available), arXiv IDs, ADS bibcodes, ISBN-10/13 (with or without dashes), ISSN/eISSN, WHO IRIS handles, and free-text lists where identifiers are automatically detected and normalized.
How does the tool detect a fabricated citation?
The verifier resolves the identifier against authoritative metadata sources and compares the resolved title and author metadata to the cited string; when a valid identifier resolves but the cited title or details don’t match, the tool flags the dominant fabrication patterns (for example, valid DOI + invented title) and reports mismatches with suggested corrected metadata.
Can I verify a whole reference list at once?
Yes—Citation Verifier accepts multi-line pasted reference lists and will detect identifiers per line, dedupe entries, and return per-item verification statuses so you can process complete bibliographies in a single step.
Does the verifier provide corrected citations I can export?
Yes—it returns normalized metadata for resolved items and can format citations in built-in styles (Vancouver, APA, AMA, IEEE, CSE) as well as any of 10,000+ CSL styles and export to formats like BibTeX, RIS, EndNote XML, CSL JSON, RefWorks, MEDLINE, CSV, and Zotero RDF.
Is there a rate limit or signup required to use the API?
The public REST API and MCP server are free for light use without signup; for higher monthly quotas and sustained programmatic use, you can obtain a BASIC RapidAPI key which increases limits—interactive web use has generous anonymous limits and requires no account.
Which data sources does the tool query to verify citations?
Citation Verifier checks CrossRef, PubMed/Europe PMC, OpenAlex/Semantic Scholar, ADS for astrophysics, OpenLibrary (for ISBN metadata), and other authoritative sources to resolve identifiers and validate metadata.
Will it fix small typos in DOIs or identifiers I paste?
Yes—the service includes a ‘healer’ that corrects minor typos in pasted DOIs and other identifiers to improve resolution rates before attempting verification.
Can I integrate Citation Verifier into an AI assistant or editor?
Yes—the project provides an MCP server and a public REST API designed for integration into AI assistants, editors, VS Code, and other tools to enable on-the-fly citation resolution and verification within workflows.
What does the verifier output when a citation cannot be resolved?
Unresolved items are marked clearly for review; the tool conservatively reports unresolved status rather than inventing metadata, and provides any partial matches or explanation (e.g., missing record in queried databases) to guide manual follow-up.
Is Scholar Sidekick a replacement for Zotero or EndNote?
No—Scholar Sidekick is intentionally a lightweight, moment-of-need tool for resolving, verifying, and exporting citations quickly; it complements reference managers by producing clean, predictable citation outputs but does not provide long-term library management features.