Direct answer
Compilatio is a similarity detection service that compares a submitted document against web content, academic publications, and its own documentary corpus, then returns a similarity percentage with every matched passage highlighted. The figure it produces is a similarity rate, not a plagiarism rate — it tells you how much of your text overlaps with identified sources, and it requires human interpretation before it means anything about your integrity. This guide explains how the service works, what happens to your document once it enters Compilatio's database, and how to verify your real Turnitin similarity and AI scores if your own institution checks with Turnitin instead [1].
What is Compilatio's similarities detection service and how does its similarity score work?
Compilatio is a similarity detection service built for schools, universities, and research institutions, and it works by comparing a submitted document against three broad families of material: the visible web, academic and scientific publications, and the institution's own documentary corpus [1]. The output is a report containing a global similarity percentage plus a source-by-source breakdown, with each matched passage highlighted in the text so a reader can see exactly what overlapped and where [1]. Compilatio deliberately frames this as similarity detection rather than "plagiarism detection," because the tool identifies textual overlap, not intent.
The similarity rate itself is a simple proportion: the share of your document's text that matches content found in the compared sources [2]. That definition matters more than it first appears. A correctly formatted direct quotation, a bibliography, a standard methods paragraph, or a common definition can all push the rate upward without any misconduct whatsoever — which is why Compilatio tells institutions to read the rate alongside the highlighted detail rather than as a standalone verdict [2]. Two documents with an identical 18% rate can be completely different in character: one might be padded with uncited copying, the other might simply cite heavily.
Compilatio also stresses that the percentage is a signal requiring human judgement, and that staff should interpret it in disciplinary context rather than treating a threshold as a pass/fail line [1][2]. In practice this means the number you see on a Compilatio report is the start of a conversation, not the end of one. If your institution has told you a specific threshold applies, that threshold is an institutional policy choice — Compilatio's own documentation does not impose one [1].
For students, the practical implication is that a Compilatio report is diagnostic. It shows you which sources your writing is closest to and which passages triggered a match, so you can check whether your paraphrasing genuinely restates the idea in your own words or merely swaps synonyms while keeping the original structure [2]. That is the useful part of the report — the highlighted passages, not the headline percentage.
Does Compilatio store my document in a database, and how is that different from Turnitin's student paper repository?
Compilatio compares submitted work against its documentary corpus, and whether your document is added to that corpus depends on the arrangement between Compilatio and your institution [3]. When student work is added, it becomes available for future comparisons — meaning a later student's submission can be matched against your paper, and yours against theirs [3]. Retention, removal, and access are governed by the institutional contract and by data-protection rules such as GDPR, which is why the same Compilatio service can behave differently at two different universities [3].
This is the structural point most students miss: "does it store my work?" is not a question with one universal answer, because the storage behaviour is configured per institution rather than fixed by the software [3]. If you are submitting through a university portal, the university's contract with Compilatio determines whether your document enters the corpus, how long it stays, and whether you can request deletion [3]. Reading your institution's academic integrity policy is therefore more informative than reading Compilatio's marketing pages.
Turnitin works on a comparable principle with its student paper repository, but the operational detail differs in ways that affect you. Turnitin's Similarity Report compares your submission against its repository, web content, and publications, and it presents a similarity index alongside source-by-source matches — with quoted and bibliographic material excluded from the index when those exclusions are switched on [4]. Crucially, Turnitin produces a separate AI writing report with its own indicator, which is a different measurement entirely from the similarity index [4]. A student can have a low similarity index and still be flagged for AI writing, or vice versa.
The practical consequence is that a Compilatio report and a Turnitin report are not interchangeable evidence. They compare against different corpora, they apply different exclusion settings, and only Turnitin generates the AI writing indicator your institution may actually act on [4]. If your university runs Turnitin, a clean Compilatio result tells you very little about what Turnitin will show.
If my university checks with Turnitin instead, how can I see my real Turnitin similarity and AI score before I submit?
The only reliable way to know what Turnitin will report is to run your draft through a Turnitin check before the deadline, because the similarity index and the AI writing indicator are produced by Turnitin's own comparison engine and cannot be inferred from another vendor's report [4]. Turnitin's own guidance is explicit that the similarity index is an interpretive aid rather than a measure of plagiarism, and that the AI writing report is a distinct signal with its own confidence behaviour [4]. Guessing at either number from a Compilatio percentage is not a safe strategy.
That is exactly the gap turnitin0.com fills. You upload a .docx, .pdf, or .txt file (English, 300–30,000 words, under 20 MB) and receive two downloadable PDFs in a single checkout: a Turnitin AI detection report and a similarity/plagiarism report, formatted the way instructors see them in their LMS. Turnaround is under 15 minutes in 98% of cases, with delivery guaranteed within 30 minutes even during queue spikes. The check is non-repository — your file is not added to Turnitin's student paper database and reports are not shared with third-party databases — so previewing your score does not create the very match you were worried about.
Reading the result correctly matters as much as getting it. Turnitin displays *% rather than an exact figure when AI detection falls below its 20% confidence threshold, and those asterisked results are low-confidence signals rather than clean bills of health. On the similarity side, check which sources matched and whether quoted and bibliographic material were excluded, since those settings change the headline number substantially [4]. Students who treat the report as a diagnostic — fixing genuine over-quoting and checking whether AI-assisted passages need rewriting — get far more value from it than students who only stare at the percentage.
The service has delivered 100,000+ Turnitin AI and similarity reports to 20,000+ students across the US, UK, Canada, Australia, New Zealand, and Ireland, with a 4.9/5.0 satisfaction rating and a Trustpilot TrustScore of 4.3/5. Pricing is pay-per-use with no subscription: $3.80 for a single check, or $2.75 per check in a 10-check pack. Note that turnitin0.com is an independent service and is not affiliated with Turnitin, LLC.
If you have been reading Compilatio documentation to work out what your institution's checker will actually say, the honest answer is that only the checker your institution uses can tell you. Running a real Turnitin check through turnitin0 before you submit replaces guesswork with the actual report — the same similarity index and the same AI writing indicator your marker will open.
※ Turnitin0.com - Actual Turnitin AI Report Cover, Score, Flag And Similarity Summary
FAQ
Is Compilatio the same as Turnitin?
No. They are separate services with separate comparison corpora and separate report formats, and only Turnitin produces the AI writing indicator many institutions act on [4]. A result from one does not predict the result from the other.
Is a high Compilatio similarity rate proof of plagiarism?
No. The similarity rate measures textual overlap with identified sources, and correctly cited quotations or a bibliography can raise it substantially [2]. Compilatio's own guidance treats the rate as a signal for human interpretation rather than a verdict [1].
Will my document be stored if I submit it to a similarity detection service?
It depends on the service and on your institution's contract. Compilatio's corpus inclusion, retention, and deletion terms are set per institution [3], while turnitin0.com checks are non-repository and never add your file to Turnitin's student paper database.
Why does Turnitin sometimes show *% instead of an AI percentage?
Turnitin displays *% when its AI detection result falls below the 20% confidence threshold, which indicates a low-confidence signal rather than a confirmed zero. Read those results alongside the highlighted passages rather than treating them as a clean result [4].
Can I check my Turnitin similarity and AI score before submitting?
Yes. A pre-submission Turnitin check returns both the similarity report and the AI detection report as downloadable PDFs, typically within 5–15 minutes, so you can revise genuine over-quoting or AI-flagged passages before the deadline [4].