Copyleaks is an enterprise plagiarism-plus-AI suite. It carries a deep plagiarism database, native LMS connectors, detection across many languages, and the SOC 2 and SSO paperwork a university or large publisher needs to get it through procurement. TextSight is the tool an individual or a small team can sign up for in a minute: affordable flat-rate detection with a per-sentence evidence map and a rewriter built in. This page is the honest version of which buyer each one is for, and why the comparison is really about procurement scale, not a single accuracy number.
A short feature table first. The narrative sections below go deeper on each row, with the parts where Copyleaks is genuinely the better call called out clearly.
| Feature | TextSight | Copyleaks |
|---|---|---|
| Primary buyer | Individuals, freelancers, small teams, agencies | Universities, school districts, large publishers, enterprise |
| Free tier (no signup) | 3 scans/day, 5,000 chars/scan, no card | Limited monthly credits, signup required |
| Entry pricing (individual) | $19.99/month Pro flat | $10.99/month for 100 pages (credit-based) |
| Pro annual effective | $14.99/month ($179.88/year) | Credit packs from $10.99/month, scales with usage |
| Sentence-level highlights | Yes, colour-coded with a reason per flagged line on the free tier | Yes, sentence highlights with confidence bands |
| ESL calibration focus | Tuned on Indian, Filipino, and Chinese student writing | Breadth across many languages; English ESL not the stated focus |
| Detection on raw AI output | Strong on raw GPT/Claude/Gemini output | Strong, backed by a large training corpus |
| Bundled AI rewriter | Yes: Light / Balanced / Maximum in same product | No, detection and plagiarism only |
| Plagiarism database matching | Style-based Plagiarism Risk only | One of the largest plagiarism databases in the industry |
| REST API | Business $39.99/mo ($29.99 annual): detection + rewriter + bulk in one key | Mature enterprise API, credit-based |
| SOC 2 Type II | Not yet certified | Type II certified |
| SAML / SSO for procurement | Not a mature procurement story today | Mature SAML / SSO with broad procurement support |
| LMS integrations (Canvas, Moodle, Blackboard, D2L, Schoology) | None native today, paste-flow only | All five major LMS connectors out-of-box |
| 30+ language detection | English-focused (calibrated for Indian/Filipino/Chinese ESL English) | 30+ languages with native detection |
| Best fit | Individual writers, students, freelancers, small agencies | Universities, K-12 districts, publishers, enterprise procurement |
TextSight figures from our own product. Copyleaks figures from its public pricing and product pages. Verify both before subscribing. TextSight is built for individual writers and small teams; Copyleaks is built for institutional and enterprise procurement. The two solve adjacent problems for different buyers, which is why both columns carry "win" markers. We publish no head-to-head accuracy number we cannot fairly measure.
Four things Copyleaks does better than TextSight today. Acknowledging them is the point of writing this page in the first place.
Copyleaks ships with SOC 2 Type II, mature SAML SSO support, standardised data-processing agreements, and an established legal trail for enterprise procurement. TextSight does not have a mature enterprise procurement story today: no SOC 2 Type II certification, and SSO is not the turnkey thing a large IT department expects. If your procurement gate requires SOC 2 and SSO before a tool can be approved, Copyleaks clears it and TextSight does not. That is a real gap, not a wording choice.
Copyleaks operates one of the largest plagiarism databases in the world with deep coverage of student paper submissions, journal articles, and licensed academic content. Every scan returns AI detection plus plagiarism overlap with per-source citation matches. TextSight provides a plagiarism risk indicator that flags overlap with public web sources but does not access licensed academic databases. For academic-integrity enforcement, this gap is large.
Copyleaks has native LMS connectors for Canvas, Moodle, Blackboard, D2L Brightspace, and Schoology, plus documented AI detection in 30+ languages. TextSight has neither today; it is English-first and ships via REST API or the Chrome extension. If your institution runs detection inside the LMS submission flow or scans Spanish, French, German, Arabic, Mandarin or Japanese at production volume, Copyleaks is the right pick.
When an academic-integrity office hears "Copyleaks flagged this submission," the sentence parses without context. The brand has been the institutional default for plagiarism since long before generative AI, and the educator-facing communications, appeal workflow, and report format are mature. TextSight does the same detection job, but it still needs a sentence of context inside a compliance review.
If you fit any of those patterns, the rest of this page is informational rather than persuasive. Copyleaks is the tool for the job.
For freelancers, agencies, SEO teams, and individual students pre-scanning their own essays, here is where TextSight beats Copyleaks on the work that matters.
Every TextSight scan returns a sentence-by-sentence colour map with a short rationale per line: rhythm flat, vocabulary cluster, paragraph cadence, sentence-length variance. You edit the specific sentences instead of rewriting the whole draft. Copyleaks shows sentence highlights too, but the per-line evidence skews toward overlap matches from its plagiarism database rather than AI-signal rationale. For working writers iterating on a draft, TextSight is faster.
Any tool can over-flag formally-taught English from a non-native writer, and a wrong flag carries a real cost in academic review. We tuned our classifier for ESL and non-native English writing, so that register is part of the training. Copyleaks' headline strength is breadth across many languages, which is a different design goal than calibrating tightly for English ESL. We will not put a number on the gap, because we cannot run Copyleaks under controlled conditions. Test it on your own writers' drafts.
TextSight Pro is $19.99 monthly or $14.99 monthly on annual billing with unlimited scans. Copyleaks Personal is around $10.99 monthly with 100 pages of detection plus plagiarism. Sticker price is close, but TextSight is flat-rate unlimited while Copyleaks scales by page credits. Past roughly 25,000 words a month, the bundle math tips clearly toward TextSight.
Every paid TextSight plan includes the AI rewriter endpoint, so a single workflow can score a draft and request a voice-preserving rewrite in the same tool. Copyleaks does not ship an AI rewriter at any tier; you would buy a second product for that step. For pipelines that need detect plus rewrite, TextSight saves a separate subscription and reduces glue code.
The Business tier ships a REST API at $39.99 monthly or $29.99 on annual billing with detection, AI rewriter, and bulk scanning behind a single key, plus a full audit log of every scan exported as CSV. Copyleaks exposes API on its higher tiers with credit-based throughput; rate limits and audit format come bundled with the contract. For agencies and editorial teams that need defensible evidence and a single SDK to call, TextSight is the cleaner integration.
The real fork between these two is not a detection score we cannot fairly measure. It is how you acquire the tool, and that follows straight from who each was built for.
Copyleaks is designed to clear an institutional or enterprise buying process. SOC 2 Type II, SAML SSO, a data-processing agreement, native LMS connectors, and detection across many languages are exactly the boxes a university IT office or a large publisher has to tick before a tool gets approved. If you scan content in Spanish, French, German, Arabic, Mandarin, or Japanese at production volume, or you cannot adopt anything without a signed DPA and an SSO integration, that whole stack is the point, and TextSight does not offer it.
TextSight is designed for the person who just needs to check a draft now. Free tier with no signup, Pro on a personal card in a minute, no procurement, no DPA negotiation, no waiting for IT to provision a seat. The detection comes with a per-sentence evidence map and a bundled rewriter, and the pricing is flat so a busy month never spikes the bill. For a freelancer, a student, or a small team, the lack of an enterprise procurement story is a non-issue, because they were never going to run one.
This is the one place the gap is not just about how you buy. Copyleaks detects across many languages natively. TextSight is English-first, with its calibration focused on English including the formally-taught ESL English written by students from India, the Philippines, and China. If your work is English, that focus is a feature. If your work spans several languages at volume, Copyleaks is the honest answer and we will not pretend otherwise.
We do not print a TextSight-versus-Copyleaks accuracy table. A fair one would require both tools run on identical passages under matched, repeatable conditions, and we cannot control an enterprise suite's environment that way, so any number would be marketing dressed as research. Both are credible detectors on raw AI text, and both can be edited around. Scan a handful of your own real drafts through each and trust what you see.
The detection-method gap between TextSight and Copyleaks is smaller than between TextSight and older perplexity-only tools, but it still shapes how each one behaves on edited content.
Copyleaks runs a multi-signal ensemble that combines perplexity, burstiness, semantic embedding analysis, and vocabulary fingerprinting. The classifier is trained on a broad corpus that includes student paper submissions from the plagiarism database, which is a meaningful data advantage on raw AI output across multiple model families. The method holds up well on unedited text and pairs naturally with the plagiarism signal in the same scan.
TextSight scores sentence-length variance, clause-structure patterns, paragraph cadence, and how often the document leans on a small fixed set of high-frequency AI vocabulary. Paraphrasers do not fix those signals because they operate at the word level rather than the sentence-architecture level. The trade-off is that rhythm scoring needs at least four or five sentences to lock in; very short snippets are harder for our model than for Copyleaks.
Take a paragraph of raw AI output. Both tools score it high. Now run it through a paraphraser once. An ensemble that leans partly on word-level signals tends to move more after that pass than a rhythm-led score, because the paraphraser is reworking exactly the kind of variance those signals read. The text reads about the same to a person. For any workflow with an editing pass between draft and detection, that difference shows up. For scanning raw, unedited submissions, the two land close together.
TextSight Pro is $19.99 monthly or $14.99 monthly on annual billing, unlimited scans. Copyleaks Personal is around $10.99 monthly for 100 pages of detection plus plagiarism. Headline pricing looks close at entry; bundle math diverges quickly with volume.
Billed $89.88/year, Save $30
Billed $179.88/year, Save $60
Billed $359.88/year, Save $120
Yearly billing saves 25%. Copyleaks Personal is around $10.99/mo for 100 pages at the time of writing; institutional contracts are custom. View full pricing →
Both detectors are good products built by serious teams. The honest answer is workload-specific. Use this picker to find the tool that fits the work you actually do.
If you decide to switch, the migration takes most teams a half-day. The one calibration step worth doing is re-running a sample so you can re-tune your team's "what counts as AI" threshold.
From the Copyleaks dashboard, open Reports and use the CSV export. You get a list of past scans with their AI scores and plagiarism overlap. Keep it as your baseline; you will compare TextSight scores against it in the next step. If LMS-integrated submissions are part of your workflow, plan to keep those flows on Copyleaks since TextSight does not replace LMS-integrated submission today.
Pick ten typical documents from the Copyleaks export that span the range of scores you saw. Run each through TextSight's bulk upload. TextSight typically scores 5 to 12 points lower on the same edited content because rhythm-based scoring weighs differently from Copyleaks' ensemble signals. If your team used 50 as the threshold on Copyleaks, your TextSight equivalent is closer to 40.
Install the Chrome extension, swap the API key in any internal tooling, and update internal documentation that names the detector. If you publish a public AI policy that mentions Copyleaks by name, update that page. Most teams complete migration in a half-day including calibration.
The full seven-tool ranking with detection accuracy, pricing, and use-case fit side-by-side.
See the ranking →The classroom-detector head-to-head. ESL, perplexity, and bundled AI rewriter compared.
Read the compare →Other tools to consider if Copyleaks does not fit your team or your volume.
Read the guide →Full tier breakdown for Free, Starter, Pro, and Business. Annual billing saves 25%.
See pricing →Start with TextSight's free tier. No card, no signup, no commitment. Your first scan in about six seconds.
Honest head-to-heads with other detectors and humanizers.