You're checking your own draft
Get a sentence-level view of what reads as AI-like, then rewrite it right there with a chosen tone — no separate editor, no re-upload.
The short answer
Choose Copyleaks if you're an institution, publisher, or reviewer scanning submitted work for AI content and plagiarism at scale. Choose Penlify if you're the writer and want to see what's flagged and fix it in one place.
You're screening other people's work
Copyleaks is built for LMS-integrated scanning across a class, department, or publication — AI and plagiarism detection with no editing step attached.
Feature and pricing comparison
This comparison avoids inventing accuracy percentages or declaring a universal winner.
| Area | Penlify | Copyleaks |
|---|---|---|
| Primary workflow | Detect AI-pattern sentences, then rewrite them in the same workspace. | Scan documents for AI-generated content and plagiarism, and report the findings. |
| Fixing a flagged passage | Rewrite it directly in Penlify with a chosen tone, without leaving the app. | Not built in — flagged text has to be edited elsewhere and re-scanned. |
| Free tier | 5 rewrites and 3 detections a month, no card required. | No ongoing free tier listed on its pricing page; plans start paid. |
| Paid pricing | Flat $2.99/mo or $24.99/yr (~$2.08/mo) — unlimited rewrites and detections. | Personal $16.99/mo ($13.99/mo billed annually) for 1,200 credits — about 300,000 scanned words. |
| Plagiarism checking | Not offered — Penlify checks for AI patterns, not source matches. | Built in, alongside AI detection, across 100+ languages. |
| Built for | Individual writers and students checking their own drafts before submitting. | Educators, institutions, publishers, and reviewers screening submitted content at scale. |
| Integrations | Web workspace and Android app. | LMS integration (Canvas, Moodle, Blackboard, D2L, and others), browser extension, Google Docs add-on, API. |
Honest tradeoff: Copyleaks has institutional-grade reach — LMS integrations, plagiarism matching, and scale that Penlify doesn't try to compete with. Penlify's case is narrower on purpose: one writer, one draft, detection and rewriting without switching tools.
Competitor details checked against Copyleaks' official AI detector page and pricing page on 28 August 2026. Product features and pricing can change.
Why a scanner and a writing tool solve different problems
Copyleaks answers a reviewer's question: does this submission show signs of AI generation or plagiarism? That's the right tool when you're an instructor grading thirty essays or a publisher vetting freelance copy — you want one dashboard, LMS integration, and a report you can act on across many documents at once.
It's the wrong shape of tool if you're the person who wrote the draft and just got flagged. A scan result tells you a percentage or a match, not what to change. You'd still need to open the document somewhere else, guess at which sentences are the problem, rewrite them, and re-scan to see if it worked.
Penlify exists for that second moment — after the flag, not instead of it. The sentence-level view shows exactly which lines read as formulaic, and the rewrite tool sits right next to it, so fixing a flagged passage doesn't mean leaving the workspace or guessing twice.
Common questions
Is Penlify free the way Copyleaks is?
Penlify has an ongoing free plan: 5 rewrites and 3 detections a month with no card required. Copyleaks' published pricing page shows no equivalent ongoing free tier — its plans start at $13.99 a month billed annually.
Can Copyleaks rewrite flagged text?
No. Copyleaks is a detection product — it scans for AI-generated content and plagiarism and reports what it finds. Fixing a flagged passage means editing it in a separate tool and re-scanning. Penlify detects and rewrites in the same workspace.
Does Penlify check for plagiarism like Copyleaks?
No. Penlify focuses on AI-pattern detection and rewriting a writer's own draft. Copyleaks combines AI detection with plagiarism matching across 100+ languages, which matters more for institutions screening submitted work than for a writer checking their own draft before sending it.
Test the workflow with your own draft
Start with the private analyzer. It gives value without requiring an account or sending the text to Penlify.