What 11 reference checkers actually check, what they cost and where each one fits. Written by TrueCitation, which makes one of them.
Updated 29 October 2026. TrueCitation publishes this page and makes one of the tools in it. Every tool, ours included, is described from its own website as of 29 October 2026, with a link to the page we used. Tools are listed alphabetically.
There is no single best citation checker; pick one for the job. To check that references are real, use a tool that looks each one up in publication databases and shows the record it matched. Free, with no account and with retraction checks: PaperCitation and Scholar Sidekick (25 references), GenText (10), RefExists and CiteProve. TrueCitation takes up to 100 per batch on paid plans.
| Tool | Records it searches | Free use | References per check | Retraction check | Paid from |
|---|---|---|---|---|---|
| CitationCheck | Crossref, OpenAlex, PubMed, arXiv | Free, no account | Up to 10 | Not yet (listed as planned) | Free |
| CitationEasy | Crossref, OpenAlex (after resolving a DOI, PMID, ISBN or arXiv ID) | Free, no account (ad-supported) | Not stated | Separate Retraction Checker | Free |
| CiteCheck | Crossref, PubMed, Semantic Scholar | 3 checks, no account needed | Not stated | Not mentioned | $9/month or $79/year |
| Citely | Crossref, PubMed, arXiv, OpenAlex | No free tier shown | 2,000 characters (trial) to 4,000 (paid) | Not mentioned | $9 one-off trial (15 credits); $19/month |
| CiteMe | OpenAlex, Crossref, Semantic Scholar, PubMed | Reference Checker 3 times a month on the free plan | Not stated | Not mentioned | Pro from $2.49/month (billed monthly) |
| CiteProve | Crossref, OpenAlex, PubMed, CourtListener | Free, no account (beta) | Not stated | Yes | Free (beta) |
| GenText Reference Checker | Crossref, OpenAlex | Free, no account, a few times an hour | Up to 10 | Yes | Free tool |
| PaperCitation | Crossref, OpenAlex, Open Library, Google Books, DataCite, PubMed | Free, no signup; pasted text isn't stored | Up to 25 | Yes (Retraction Watch data) | Free |
| RefExists | Crossref, DataCite, doi.org, OpenAlex, PubMed, Open Library | Free, no account; runs in your browser | Not stated | Yes (OpenAlex data, which it calls incomplete) | Free |
| Scholar Sidekick | Resolves DOI, PMID, PMCID, ISBN, arXiv and more; title search in Crossref, PubMed, OpenAlex | Free audit, no signup | Up to 25 | Yes, plus corrections and expressions of concern | US$9 one-off evidence report |
| TrueCitation | Crossref, OpenAlex, Semantic Scholar, PubMed, DataCite | 1 check a day without an account; 3 more with a free account | 1 without an account; up to 100 per batch (1 credit per reference) | Yes (available retraction and correction notices) | $9/month (50 checks) |
From each tool's website on 29 October 2026. "Not stated" or "not mentioned" means we didn't find it on the pages linked.
A free, public-interest checker that publishes its classification rules and shows the evidence behind each result. Good for a quick check of a short list; it doesn't flag retractions yet. Source: citationcheck.org
Part of a free citation generator. Each reference comes back found, mismatched or not found, and lookups that couldn't run are marked as not checked. Source: www.citationeasy.com
Hands back a corrected reference list. The paid plan adds unlimited checks and .docx, .pdf and .pptx upload, so it suits whole documents. Source: citecheck.app
Credit-based, and it also finds sources that support a claim. Suits people who want source discovery and checking in one place. Source: citely.ai
Mainly a citation generator (60+ styles free, 10,000+ on Pro) with a reference checker attached. Suits people who format citations there and check now and then. Source: citeme.app
Reads references in any common style, including legal citations through CourtListener, and flags wrong DOIs and retracted papers. Source: citeprove.com
A quick, rate-limited check of up to 10 references or DOIs, with retraction status. Source: app.gentext.ai
Free, 25 references at a time, retraction warnings and book sources (Open Library, Google Books). It notes that it can miss books, non-English titles and grey literature. Source: papercitation.com
Your references leave the browser only as registry lookups. It takes plain-text lists for now (no BibTeX or RIS) and keeps "registry unreachable" apart from its verdicts. Source: refexists.dsl4.com
Wide identifier support, and it checks for retractions, corrections and expressions of concern. It also offers an API. Source: scholar-sidekick.com
Our tool. For each reference it shows the matched record, any conflicting fields and which lookups completed; batches take up to 100 references, with APA, MLA and Chicago suggestions, alongside source-credibility, DOI and bibliography tools. Its free allowance is smaller than several tools above. Source: truecitation.com/pricing
No. It can show that the databases it searched have no matching record, or that the details conflict with a record. Books, theses, reports, very recent papers and journals without DOIs can be missing from those databases, so find the work yourself before deciding. See how to check a reference by hand.
No. These tools check references against publication records; PaperCitation and TrueCitation say outright that they don't detect AI use. A reference that checks out can still be cited for a claim it doesn't support.
Look at the limit per check: 10 references (CitationCheck, GenText), 25 (PaperCitation, Scholar Sidekick) or up to 100 per batch with credits (TrueCitation). CiteCheck's paid plan takes uploaded documents instead of pasted lists.
On 29 October 2026 we read each tool's public pages, linked above, and recorded what it says it checks, its free use, its limits and its prices. This is not a lab test: we didn't run the same references through every tool.
We picked the tools from those ChatGPT and Perplexity named when we asked them about citation checkers that day. It isn't every tool on the market or every tool they named: CiteTools, CudekAI, EvalCite, Folio, Labrix, Paperpile, Resea and TypesetOS aren't covered yet, and RefRunner's site was unreachable.
Prices and limits change, so check the tool's site before relying on them. To report an error, email support@truecitation.com.
Want to try ours? Check a reference with TrueCitation. First check free, no signup.