Updated 13 Nov 2026 · prices read on vendor pages

16 best Copyleaks alternatives in 2027

Reviewed by Mehmet Elmicenni, founder of Zekai•Prices checked 13 Nov 2026•How we check

The short answer

The best Copyleaks alternatives in 2027 are Originality.ai (best overall, $12.95/mo billed yearly), GPTZero (best free plan: 10,000 words a month) and SlopTotal (best open source, MIT). Copyleaks itself starts at $13.99/mo billed yearly. Zekai checked these prices on vendor pages on 13 Nov 2026; 13 more are compared below, including 4 with a free plan and 6 open source.

Open the Zekai Cost Finder Get price alerts

Best overallSee in table →

Originality.ai

$12.95/mo billed yearly · free plan

7.7

Best free planSee in table →

GPTZero

$12.99/mo billed yearly · free plan

6.3

Best open sourceSee in table →

SlopTotal

Free to self-host · MIT

6.9

16alternatives compared

6with a free plan

7open source

$8/mo billed yearlycheapest paid · Isgen

$13.99/mo billed yearlyCopyleaks starts at

01 · Zekai Price Ledger

Which Copyleaks alternatives are worth it in 2027?

The tools most often weighed against Copyleaks are Turnitin for institutions, GPTZero for sentence highlights and model detection, Originality.ai for bulk publisher checks, Winston AI for text plus deepfake detection, and ZeroGPT. Isgen is the cheapest paid plan listed here, at $8 a month billed yearly.

Zekai Cost Finder · team1 person

Tool	Type	Starting price	Free plan limit	Best for	Cost for your team	Checked
CopyleaksThe tool you are replacing	You are here	$13.99/mo billed yearlyPersonal, billed yearly or $16.99 billed monthly; Pro $74.99 yearly or $99.99 monthly	25,000 characters per free scan; no free plan on pricing page	Plagiarism plus AI checks bought by credit	—	12 Nov 2026	Pricing ↗
GPTZero Zekai score 6.3Best free plan	Free plan + paid	$12.99/mo billed yearlyPremium, billed yearly or $23.99 billed monthly	10,000 words a month, 1 advanced scan	Teachers wanting sentence highlights and model detection	—	12 Nov 2026	Pricing ↗
Originality.ai Zekai score 7.7Best overall	Free plan + paid	$12.95/mo billed yearlyPro, billed yearly or $14.95 billed monthly	10K words (100 credits) one time; comparison table says 60 credits renewing daily	Bulk content checks for publishers and agencies	—	12 Nov 2026	Pricing ↗
Winston AI Zekai score 7.7	Free plan + paid	$10/mo billed yearlyEssential, billed yearly or $18 billed monthly (list; WINSTON50 code shows 50% off)	2,000 credits, 14-day trial	Detecting AI text, images and deepfakes together	—	12 Nov 2026	Pricing ↗
ZeroGPT Zekai score 4.6	Free plan + paid	$8.99/mo billed yearlyPro, billed yearly or $14.99 billed monthly	15,000 characters per AI detection	Quick free AI text checks with batch upload	—	12 Nov 2026	Pricing ↗
Quetext Zekai score 7.6	Free plan + paid	$14.99/moEssential, from (monthly); yearly price not listed on the page	AI detector up to 1,000 words; plagiarism checker up to 1,000 words	Plagiarism checker and AI detector bundle	—	12 Nov 2026	Pricing ↗
Isgen Zekai score 7.3Cheapest paid	Paid	$8/mo billed yearlyAcademic, billed yearly or $14 billed monthly	No free plan	Low-cost academic detector with plagiarism check	—	12 Nov 2026	Pricing ↗
PlagiarismCheck.org Zekai score 5.5	Paid	Not checkedAdvanced and Pro are quote only	No free plan	Institutional plagiarism and AI checks	—	12 Nov 2026	Pricing ↗
Scribbr Zekai score 7.5	Free	Free plan; paid price not publishedPremium AI Detector: no price shown on page	Unlimited free AI checks, no sign-up; word cap not stated	Students wanting a no-sign-up free check	$0	12 Nov 2026	Pricing ↗
Turnitin Zekai score 8.6	Paid	Not checkedInstitutional quote only, no public price	No free plan	Institution-wide similarity and AI writing checks	—	12 Nov 2026	Pricing ↗
SlopTotal Zekai score 6.9Best open source	Open source	Free (self-hosted)	No limit, self-hosted (MIT)	Self-hosted multi-engine AI text detector	$0	13 Nov 2026	Code ↗
Binoculars Zekai score 3.5	Open source	Free (self-hosted)	No limit, self-hosted (BSD-3-Clause)	Research-grade zero-shot detection you run yourself	$0	13 Nov 2026	Code ↗
Fast-DetectGPT Zekai score 5.1	Open source	Free (self-hosted)	No limit, self-hosted (MIT)	Zero-shot detection from an ICLR 2024 paper	$0	13 Nov 2026	Code ↗
Open Detector Zekai score 6.4	Open source	Free (self-hosted)	No limit, self-hosted (MIT)	Academic-paper AI detection with a small model	$0	13 Nov 2026	Code ↗
SynthID Text Zekai score 6.3	Open source	Free (self-hosted)	No limit, self-hosted (Apache-2.0)	Watermark detection for text you generate	$0	13 Nov 2026	Code ↗
Dolos Zekai score 7.1	Open source	Free (self-hosted)	No limit, self-hosted (MIT)	Source-code plagiarism checks in programming courses	$0	13 Nov 2026	Code ↗
JPlag Zekai score 7.3	Open source	Free (self-hosted)	No limit, self-hosted (GPL-3.0)	Source-code plagiarism checks across many languages	$0	13 Nov 2026	Code ↗

Every price was read on the vendor's own pricing page on the date shown. The Cost Finder assumes one entry plan per person, so it multiplies by your team size; yearly prices are shown per month, and team or business plans can cost more per seat. "Not checked" means we could not confirm a public price.

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02 · Free plan

Is there a free version of Copyleaks?

Partly. Copyleaks' pricing page lists no free plan, only Personal at $13.99 a month billed yearly, but its AI detector page offers a free scan up to 25,000 characters, and a free account unlocks more monthly scan credits. Each paid credit covers up to 250 words or 1 image.

Source: Copyleaks pricing page, read 12 Nov 2026.

Free$0

25,000 characters per free scan; no free plan on pricing page

Paid from$13.99/mo billed yearly

Personal, billed yearly or $16.99 billed monthly; Pro $74.99 yearly or $99.99 monthly

03 · Free alternatives

What are the best free Copyleaks alternatives?

GPTZero has the largest recurring free plan here at 10,000 words a month. Scribbr advertises unlimited free AI checks with no word cap stated, ZeroGPT allows 15,000 characters per detection, Quetext 1,000 words, and Winston AI 2,000 credits over 14 days. Copyleaks offers a free scan up to 25,000 characters.

GPTZero

Best free planFree plan + paid

10,000 words a month, 1 advanced scan

Paid from $12.99/mo billed yearly

vs Copyleaks →Zekai review

Originality.ai

Best overallFree plan + paid

10K words (100 credits) one time; comparison table says 60 credits renewing daily

Paid from $12.95/mo billed yearly

vs Copyleaks →Zekai review

Winston AI

Free plan + paid

2,000 credits, 14-day trial

Paid from $10/mo billed yearly

vs Copyleaks →Zekai review

ZeroGPT

Free plan + paid

15,000 characters per AI detection

Paid from $8.99/mo billed yearly

vs Copyleaks →Zekai review

Quetext

Free plan + paid

AI detector up to 1,000 words; plagiarism checker up to 1,000 words

Paid from $14.99/mo

vs Copyleaks →Zekai review

Scribbr

Free

Unlimited free AI checks, no sign-up; word cap not stated

vs Copyleaks →Zekai review

04 · Open source

What are the best open-source Copyleaks alternatives?

Open-source AI text detectors are few. SlopTotal (MIT) runs 23 detection engines in Docker on a CPU with about 8.3 GB of RAM. Fast-DetectGPT (MIT), Binoculars (BSD-3-Clause) and Open Detector (MIT) are Python models you run yourself; SynthID Text only detects its own watermark. Dolos (MIT) and JPlag (GPL-3.0) compare source code, not prose.

SlopTotal

MIT★ 114 GitHub stars · 13 Nov 2026

To self-host: Run docker run -p 8000:8000 ghcr.io/pablocaeg/sloptotal or the docker compose file; it detects your CPU, RAM and GPU at startup and needs about 8.3 GB of RAM for models.

Commercial use: Yes (MIT).
Runs on: Runs on CPU; loaded models need about 8.3 GB of RAM; GPU optional.
Setup: Moderate · One docker run command; models download on first start.
Last commit: 3 Nov 2026

Last release 3 Nov 2026

Zekai open-source page Source code ↗Managed hosting slot

Binoculars

BSD-3-Clause★ 435 GitHub stars · 13 Nov 2026

To self-host: The repo is Python (pip install -e .) and scores text with two Falcon-7B models, so both 7B models must be downloaded; no hosted page, so you supply the hardware.

Commercial use: Yes for the code (BSD-3-Clause); check the licence of the Falcon models you download.
Runs on: Python 3.9; two 7B models, so a GPU or large-memory machine.
Setup: Hard · Clone the repo, pip install, then download two 7B models.
Last commit: 14 May 2024

Zekai open-source page Source code ↗Managed hosting slot

Fast-DetectGPT

MIT★ 440 GitHub stars · 13 Nov 2026

To self-host: Python scripts: run scripts/local_infer.py for an interactive demo with gpt-neo-2.7B, or pass gpt-j-6B as the sampling model; an online demo and API are at fastdetect.net.

Commercial use: Yes (MIT).
Runs on: Authors ran it on an 80 GB A100; the local demo defaults to gpt-neo-2.7B.
Setup: Hard · Python 3.8 and PyTorch 1.10 environment plus model downloads.
Last commit: 7 Feb 2026

Zekai open-source page Source code ↗Managed hosting slot

Open Detector

MIT★ 254 GitHub stars · 13 Nov 2026

To self-host: Install transformers and torch, then load followsci/bert-ai-text-detector from Hugging Face in a short Python script; text over 512 tokens is truncated, and it targets academic writing.

Commercial use: Yes (MIT); the Hugging Face model card also states MIT.
Runs on: Python with PyTorch and Transformers; BERT-base model, 512-token input.
Setup: Moderate · pip install transformers torch, then a short Python script.
Last commit: 12 Nov 2026

Zekai open-source page Source code ↗Managed hosting slot

SynthID Text

Apache-2.0★ 1.3k GitHub stars · 13 Nov 2026

To self-host: Install from PyPI or clone the repo and open the Colab or local Jupyter notebook; it watermarks Gemma 3 270M IT or GPT-2 text, then detects it.

Commercial use: Yes (Apache-2.0), but the repo calls itself a reference implementation, not for production.
Runs on: Any GPU such as a T4 for Gemma 3 270M; GPT-2 runs on CPU.
Setup: Moderate · Python virtual environment and a Jupyter notebook from the repo.
Last commit: 26 Oct 2026

Zekai open-source page Source code ↗Managed hosting slot

Dolos

MIT★ 357 GitHub stars · 13 Nov 2026

To self-host: Self-host with docker-compose and prebuilt images, or run the CLI; v2.10.0 needs Node.js 22 or newer.

Commercial use: Yes (MIT).
Runs on: Node.js 22 or newer, or Docker; a free hosted web app also exists.
Setup: Easy · npm install -g @dodona/dolos gives a CLI; web hosting needs Docker.
Last commit: 12 Nov 2026

Last release 19 Oct 2026

Zekai open-source page Source code ↗Managed hosting slot

JPlag

GPL-3.0★ 2k GitHub stars · 13 Nov 2026

To self-host: Download a released jar, or build with Maven, and run it on Java SE 25; the CLI opens a report viewer, and similarity is calculated locally.

Commercial use: Yes; GPL-3.0 means sharing source if you distribute changes.
Runs on: Java SE 25; runs locally, and no code or results are uploaded.
Setup: Moderate · Download a release jar and run it on Java 25.
Last commit: 5 Oct 2026

Last release 11 Dec 2025

Zekai open-source page Source code ↗Managed hosting slot

05 · Side by side

How does Copyleaks compare with each alternative?

Against Copyleaks, GPTZero bills by words not credits, Turnitin and PlagiarismCheck.org sell by quote to institutions, Originality.ai adds scan history and seats, Winston AI adds OCR for handwriting, ZeroGPT and Isgen cost less, and Quetext bundles a humanizer and summarizer.

Copyleaks vs GPTZero

Best free planFree plan + paid$12.99/mo billed yearly · checked 12 Nov 20266.3

The differenceFree plan allows 10,000 words a month; Premium lists 300,000 words a month, multi-model detection (Gemini, Claude, LLaMa), 50,000 characters per scan and 50-file batch upload, billed per word not per credit.

Switch to GPTZero ifyou want a recurring free word quota and a detector that names the model family and highlights mixed AI and human sentences

Stay with Copyleaks ifyou need image detection, whole-site sitemap scans or a 25-seat plan in one credit-based account

Pros

Simple interface: paste text or upload a file.
Provides a clear overall probability score.

Cons

Detection is probabilistic; it cannot be 100% certain.
Risk of false positives: can incorrectly flag human writing as AI.

Pros and cons from the Zekai review of GPTZero · Verdict: Helpful, but fallible.

Visit GPTZero Read the Zekai review Price alert

Copyleaks vs Originality.ai

Best overallFree plan + paid$12.95/mo billed yearly · checked 12 Nov 20267.7

The differencePro gives 200K words (2K credits) a month with 30-day scan history, bulk scan, shareable reports and a Chrome extension; Copyleaks Personal gives 100 credits of 250 words each, about 25,000 words.

Switch to Originality.ai ifyou audit freelance copy for a publisher and want 200K words a month with team seats and scan history

Stay with Copyleaks ifyou need plagiarism checks across 30 languages plus image detection from one credit pool

Pros

Third-party studies validate its high accuracy
All-in-one suite: AI, plagiarism, fact-check, readability

Cons

Risk of false positives requires human review
The comprehensive feature set may be overkill for simple checks

Pros and cons from the Zekai review of Originality.ai · Verdict: Comprehensive Content Integrity Suite

Visit Originality.ai Read the Zekai review Price alert

Copyleaks vs Winston AI

Free plan + paid$10/mo billed yearly · checked 12 Nov 20267.7

The differenceCredit-based: Essential gives 100,000 credits a month and covers AI image and deepfake detection, OCR for scans and handwriting, plagiarism checks and shareable PDF reports; Advanced adds 5 team members.

Switch to Winston AI ifyou want text, image and deepfake detection together and a cheaper entry plan than credit packs

Stay with Copyleaks ifyou need document-level plagiarism checks and cross-language matching on larger teams

Pros

Combines AI detection with plagiarism checking in one tool.
OCR function is a unique feature for scanning printed or handwritten work.

Cons

Detection is probabilistic and should not be treated as definitive proof.
Documented risk of false positives, which can unfairly affect non-native English speakers.

Pros and cons from the Zekai review of Winston AI · Verdict: A solid, indicative tool.

Visit Winston AI Read the Zekai review Price alert

Copyleaks vs ZeroGPT

Free plan + paid$8.99/mo billed yearly · checked 12 Nov 20264.6

The differenceFree forever with 15,000 characters per detection and no card; Pro at $8.99 a month billed yearly allows 100,000 characters, 50 batch files and a 750-word one-time plagiarism check.

Switch to ZeroGPT ifyou want a free no-card checker plus a low-cost Pro for occasional AI checks rather than credit billing

Stay with Copyleaks ifyou need institution-grade plagiarism reports and LMS integrations such as Canvas and Moodle

Pros

Generous free tier for checking short texts.
Simple copy-and-paste interface is very easy to use.

Cons

Results are probabilistic and not guaranteed to be accurate.
Can produce false positives, incorrectly flagging human writing as AI-generated.

Pros and cons from the Zekai review of ZeroGPT · Verdict: A fast, but fallible, guide.

Visit ZeroGPT Read the Zekai review Price alert

Copyleaks vs Quetext

Free plan + paid$14.99/mo · checked 12 Nov 20267.6

The differenceEssential bundles a plagiarism checker and AI detector on 100k words a month, plus a humanizer, summarizer, API access and 20-file bulk upload; the free AI detector stops at 1,000 words.

Switch to Quetext ifyou want a plainer plagiarism-first tool with a humanizer and summarizer bundled in at a similar monthly price

Stay with Copyleaks ifyou scan by credit with image checks and website crawling by sitemap

Pros

Combines plagiarism and AI detection in one interface.
Clear visual feedback with color-coded highlighting.

Cons

AI detection is probabilistic and can produce false positives on genuine human writing.
Detection models may penalize people writing in a second language.

Pros and cons from the Zekai review of Quetext · Verdict: A dual-purpose checker.

Visit Quetext Read the Zekai review Price alert

Copyleaks vs Isgen

Cheapest paidPaid$8/mo billed yearly · checked 12 Nov 20267.3

The differenceAcademic plan is $8 a month billed yearly ($14 monthly) for 350,000 detection words a month, phrase-level analysis, a plagiarism checker, 60,000 characters per submission and 15 days of history.

Switch to Isgen ifyou want a cheaper yearly plan with 350,000 detection words and no credit counting

Stay with Copyleaks ifyou want Copyleaks' multi-language plagiarism matching and sitemap-based website scans

Pros

Extremely easy to use: just copy and paste
Provides results almost instantly

Cons

Detection is probabilistic and can be inaccurate.
Risk of false positives, which can unfairly flag human writing, especially from non-native speakers.

Pros and cons from the Zekai review of Isgen · Verdict: A simple first-pass check.

Visit Isgen Read the Zekai review Price alert

Copyleaks vs PlagiarismCheck.org

PaidNot checked5.5

The differenceSells Advanced and Pro organisation plans by quote only; the pricing page lists a Google Docs add-on, LMS integrations and onboarding, and Pro offers any interface language.

Switch to PlagiarismCheck.org ifyou are an institution that wants a quoted plan with LMS integrations and a Google Docs add-on

Stay with Copyleaks ifyou want published self-serve prices and a credit-based personal plan you can start today

Pros

Combines plagiarism and AI detection in one tool
Integrates with common Learning Management Systems (LMS)

Cons

AI detection is probabilistic and can produce false positives on human writing.
False positives from AI detectors can disproportionately affect non-native English speakers.

Pros and cons from the Zekai review of PlagiarismCheck.org · Verdict: Dual plagiarism & AI check

Visit PlagiarismCheck.org Read the Zekai review Price alert

Copyleaks vs Scribbr

FreeFree plan; paid price not published7.5

The differenceAdvertises unlimited free AI checks with no sign-up and a separate Premium AI Detector; the page states no word cap and no published Premium price.

Switch to Scribbr ifyou only need quick free AI-text checks without an account and no plagiarism database

Stay with Copyleaks ifyou need document-level plagiarism matching against web and publisher sources

Pros

Simple copy-and-paste interface is easy to use.

Cons

Detection is probabilistic and not 100% accurate; false positives are possible.
Can incorrectly flag human writing, especially from non-native English speakers.

Pros and cons from the Zekai review of Scribbr · Verdict: A cautious first opinion.

Visit Scribbr Read the Zekai review Price alert

Copyleaks vs Turnitin

PaidNot checked8.6

The differenceSold to institutions through sales with LMS integration; its AI writing detection is described as available with Originality, and no price or free tier is published.

Switch to Turnitin ifyour institution already licenses it and needs LMS-integrated similarity and AI reports

Stay with Copyleaks ifyou buy as an individual and want a published self-serve price per month

Cons

AI detection is probabilistic and can generate false positives on human writing.
The risk of false positives is higher for students writing in a second language.

Pros and cons from the Zekai review of Turnitin · Verdict: Institutional integrity tool.

Visit Turnitin Read the Zekai review Price alert

Copyleaks vs SlopTotal

Best open sourceOpen sourceFree (self-hosted)6.9

The differenceRuns 23 detection engines, including Binoculars and Fast-DetectGPT, on your own CPU and returns one calibrated score with per-engine votes, file and URL scanning, and a JSON API.

Switch to SlopTotal ifyou want a self-hosted detector with a web page and API that runs on a CPU

Stay with Copyleaks ifyou need a vendor-supported service with accounts, teams and an uptime commitment

Visit SlopTotal Read the Zekai review Price alert

Copyleaks vs Binoculars

Open sourceFree (self-hosted)3.5

The differenceZero-shot detector needing no training data; it scores text with two Falcon-7B models locally and returns a score, without sentence highlighting or a web dashboard.

Switch to Binoculars ifyou want self-hosted detection with no per-credit billing and can run 7B models

Stay with Copyleaks ifyou want plagiarism matching and reports, which a model-scoring script lacks

Visit Binoculars Read the Zekai review Price alert

Copyleaks vs Fast-DetectGPT

Open sourceFree (self-hosted)5.1

The differenceICLR 2024 zero-shot method using conditional probability curvature; the README reports 0.9887 AUROC on five-model generations and ships a local script, with no dashboard or upload.

Switch to Fast-DetectGPT ifyou want a peer-reviewed scoring method you can run on your own GPU

Stay with Copyleaks ifyou want to paste text into a web page and get a result without installing models

Visit Fast-DetectGPT Read the Zekai review Price alert

Copyleaks vs Open Detector

Open sourceFree (self-hosted)6.4

The differenceBERT-base classifier trained for academic papers; the README claims 99.57% accuracy on its own dataset and says it is stylometric only. It is a model and script, not a web app.

Switch to Open Detector ifyou check academic papers and want an MIT-licensed BERT model you can run locally

Stay with Copyleaks ifyou check blog posts, emails or marketing copy rather than academic writing

Visit Open Detector Read the Zekai review Price alert

Copyleaks vs SynthID Text

Open sourceFree (self-hosted)6.3

The differenceGoogle DeepMind reference code that detects only text carrying its SynthID watermark; the frequentist detector gives a binomial p-value for a key, so it cannot flag unwatermarked ChatGPT or Claude output.

Switch to SynthID Text ifyou generate text with your own model and want to watermark it for later verification

Stay with Copyleaks ifyou need to check ChatGPT, Claude or Gemini text that carries no watermark you control

Visit SynthID Text Read the Zekai review Price alert

Copyleaks vs Dolos

Open sourceFree (self-hosted)7.1

The differenceCompares source-code submissions with each other and shows similarity scores and a side-by-side view; it checks code only and does not detect AI-written prose.

Switch to Dolos ifyou teach programming and want to compare student code submissions against each other yourself

Stay with Copyleaks ifyou need AI text detection and prose plagiarism matching, which Dolos does not do

Visit Dolos Read the Zekai review Price alert

Copyleaks vs JPlag

Open sourceFree (self-hosted)7.3

The differenceFinds pairwise similarities among a set of programs and shows them in a report viewer; it compares source code in many languages and does not read essays or detect AI-written prose.

Switch to JPlag ifyou grade programming assignments and want a local Java tool that compares submissions pairwise

Stay with Copyleaks ifyou check essays or articles, since JPlag compares source code only

Visit JPlag Read the Zekai review Price alert

06 · What changed

Why do people leave Copyleaks?

12 Nov 2026
Personal costs $16.99 a month billed monthly versus $13.99 a month billed annually, and Pro $99.99 monthly versus $74.99 annually; the pricing page lists no free plan. (source)
12 Nov 2026
Personal includes 100 credits a month, with one credit covering up to 250 words or 1 image, which is roughly 25,000 words; Pro includes 1,000 credits and 25 seats, and the API is sold through sales for education and enterprise. (source)
12 Nov 2026
The AI detector page offers a free scan up to 25,000 characters in the browser extension range, and says a free account unlocks more monthly scan credits. (source)

08 · FAQ

Questions people ask about Copyleaks alternatives

What is the best alternative to Copyleaks in 2027?

Originality.ai is the best overall Copyleaks alternative on this page ($12.95/mo billed yearly). For no cost, GPTZero has a free plan (10,000 words a month, 1 advanced scan). To self-host, SlopTotal is open source (MIT).

Is there a free version of Copyleaks?

Yes. Copyleaks has a free plan: 25,000 characters per free scan; no free plan on pricing page. Paid plans start at $13.99/mo billed yearly, checked on 12 Nov 2026.

Is there a 100% free alternative to Copyleaks?

Yes. SlopTotal, Binoculars, Fast-DetectGPT, Open Detector, SynthID Text, Dolos, JPlag are open source and free to self-host. GPTZero, Originality.ai, Winston AI, ZeroGPT, Quetext, Scribbr have a free plan with limits, shown in the table.

What is cheaper than Copyleaks?

Isgen starts at $8/mo billed yearly, against $13.99/mo billed yearly for Copyleaks, as listed on each vendor's pricing page on 12 Nov 2026.

How much do Copyleaks alternatives cost for a team of 5?

If each of 5 people buys the entry paid plan, at the prices Zekai checked on 13 Nov 2026, the monthly cost is Isgen $40/mo, ZeroGPT $44.95/mo, Winston AI $50/mo, against Copyleaks $69.95/mo for Copyleaks. Team and business plans can cost more per seat. The Zekai Cost Finder on this page recalculates for any team size.

Which is better, Originality.ai or Copyleaks?

Pro gives 200K words (2K credits) a month with 30-day scan history, bulk scan, shareable reports and a Chrome extension; Copyleaks Personal gives 100 credits of 250 words each, about 25,000 words. Choose Originality.ai if you audit freelance copy for a publisher and want 200K words a month with team seats and scan history. Stay with Copyleaks if you need plagiarism checks across 30 languages plus image detection from one credit pool.

Why are people leaving Copyleaks?

The documented reasons are: Personal costs $16.99 a month billed monthly versus $13.99 a month billed annually, and Pro $99.99 monthly versus $74.99 annually; the pricing page lists no free plan (12 Nov 2026); Personal includes 100 credits a month, with one credit covering up to 250 words or 1 image, which is roughly 25,000 words; Pro includes 1,000 credits and 25 seats, and the API is sold through sales for education and enterprise (12 Nov 2026). Each is sourced in the section above.

What is better than Copyleaks?

It depends on the job: GPTZero for sentence highlights and a monthly free quota, Turnitin for institutions, Originality.ai for bulk publisher checks, Winston AI for images.

09 · Method

How did Zekai check this page?

Zekai independently reviews AI tools. For this page we read each vendor's own pricing and product pages and recorded the starting price, the free-plan limit and the date of the check. Only tools that do the same job as Copyleaks are listed, and sponsors never change the order or the scores.

Mehmet Elmicenni

Founder of Zekai. Reviews the alternatives pages and the price checks behind them.

About the founder · How Zekai scores tools

JSON copy Markdown copy

1 · Same job onlyEvery alternative does the same task as Copyleaks; tools for other jobs are left out.

2 · Vendor pages onlyPrices and free limits come from each vendor's own pricing page, never from blogs.

Zekai score0–10, from four published weights: ease 25%, output quality 30%, value 20%, time saved 25%. How we score

3 · Re-checkedA price older than 35 days is re-read or the page falls back to an older version.

Change log

12 Nov 2026
Page rebuilt on v6; all prices re-read on vendor pages.
13 Nov 2026
Open-source options expanded; each now shows licence, commercial use, hardware and setup.

16 best Copyleaks alternatives in 2027

Originality.ai

GPTZero

SlopTotal

Which Copyleaks alternatives are worth it in 2027?

Know first when Copyleaks or an alternative changes price

Your tool here

Is one of these tools yours?

Is there a free version of Copyleaks?

What are the best free Copyleaks alternatives?

GPTZero

Originality.ai

Winston AI

ZeroGPT

Quetext

Scribbr

What are the best open-source Copyleaks alternatives?

SlopTotal

Binoculars

Fast-DetectGPT

Open Detector

SynthID Text

Dolos

JPlag

How does Copyleaks compare with each alternative?

Copyleaks vs GPTZero

Copyleaks vs Originality.ai

Copyleaks vs Winston AI

Copyleaks vs ZeroGPT

Copyleaks vs Quetext

Copyleaks vs Isgen

Copyleaks vs PlagiarismCheck.org

Copyleaks vs Scribbr

Copyleaks vs Turnitin

Copyleaks vs SlopTotal

Copyleaks vs Binoculars

Copyleaks vs Fast-DetectGPT

Copyleaks vs Open Detector

Copyleaks vs SynthID Text

Copyleaks vs Dolos

Copyleaks vs JPlag

Why do people leave Copyleaks?

More comparisons for AI content detector

Questions people ask about Copyleaks alternatives

What is the best alternative to Copyleaks in 2027?

Is there a free version of Copyleaks?

Is there a 100% free alternative to Copyleaks?

What is cheaper than Copyleaks?

How much do Copyleaks alternatives cost for a team of 5?

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