Most citation checkers proofread your reference formatting. None of that helps if a source doesn't exist, was retracted, or never said what you claim it says. Acurio checks those three things: the ones your examiner actually cares about.
A citation can be perfectly formatted and still sink your thesis. Three failure modes matter, and formatting isn't one of them.
AI writing tools invent references that look real. In a 2025 peer-reviewed study, one in five references GPT-4o generated didn't exist at all. Acurio checks every reference against Crossref, OpenAlex, and DOAJ. Fabricated entries surface immediately.
A real paper can still be withdrawn science. Citing a retracted study, knowingly or not, undermines the argument built on it. Acurio flags retracted and corrected sources in the same pass.
The hardest failure to catch: a real source cited for something it never says. Acurio reads your uploaded source PDFs and compares every claim in your text against the actual passage. Supported, partial, or unsupported, with the exact quote.
None of these tools is a substitute for the others; they answer different questions. Here's who checks what, based on each vendor's own documentation.
| Acurio | Scribbr | QuillBot | Turnitin | |
|---|---|---|---|---|
| Source exists (not AI-invented) | Yes: Crossref, OpenAlex, DOAJ | No. Built for formatting checks. | No. Built to generate citations. | Not its focus |
| Retraction status | Yes | No | No | No |
| Source supports the claim | Yes: reads your uploaded sources | No | No | No |
| Citation formatting (APA, MLA, …) | Not its focus | Yes: APA 6th/7th checker | Yes: 1,000+ styles | No |
| Plagiarism / text overlap | No | Separate tool | Separate tool | Yes: Similarity Report |
| AI-writing detection | No | Separate tool | Separate tool | Yes |
Competitor capabilities as of July 2026, from each vendor's public documentation (linked in the column headers); features change, so verify current capabilities. All trademarks belong to their respective owners.
The existence and retraction checks are free to try. Paste your reference list:
Run the free quick-checkPaste your bibliography. Acurio instantly checks every entry against Crossref & OpenAlex and flags retracted papers. Try it right here.
Paste your bibliography. Acurio instantly checks every entry against Crossref & OpenAlex and flags retracted papers.
A citation is a promise: “this source backs this sentence.” The only way to verify the promise is to open the source and read it, which is exactly what Acurio does. It extracts every claim in your text, finds the relevant passage in the source you uploaded, and shows both side by side.
“Children with targeted support consistently achieve significantly higher completion rates (Weber 2021, p. 213).”
“In two of the four cohorts there was a positive but not consistently significant association.”
Partially supported. The source backs a weaker claim than the text asserts: overstatement.
Formatting checkers see a flawless citation here. The reference is real, the style is correct, and the claim is still wrong.
Thousands of papers are retracted every year, for fraud, fatal errors, or fabricated data, and they keep getting cited for years afterwards by authors who never checked. Retraction status isn't printed on the PDF you downloaded three years ago. Acurio checks every reference for retractions and corrections automatically, in the same pass as the existence check.
The free quick-check includes retraction status. Paste any reference list, no account needed.
Good: keep using it. Turnitin's Similarity Report finds text overlap, and its AI-writing detection estimates whether text was machine-generated. Both are about the text itself. Neither opens your sources.
A hallucinated citation passes a plagiarism check clean. A fabricated reference is original text; there's nothing to match against. Similarity: 0%.
A misquoted real source passes too. Paraphrasing a source into something it never said is exactly what plagiarism tools are designed to accept as your own words.
Different question, complementary answer. Turnitin asks: is this text original? Acurio asks: are the sources behind it real, current, and correctly used? Serious work needs both answers.
Acurio doesn't replace your plagiarism check. It closes the gap that one leaves open.
Students Check your thesis before submission, especially if AI helped anywhere in your workflow. Your name is on the bibliography, not the model's.
Researchers Verify a manuscript's reference list before the reviewers do. Retractions and overstated citations surface before submission, not after.
Supervisors & examiners Check citation fidelity across whole submission batches, with a verdict and source passage per claim. Defensible in front of any board.
Existence and retraction free in seconds. Claim-by-claim verification for the whole thesis when you need it.