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Updated 13 Nov 2026 · prices read on vendor pages

12 best ZeroGPT alternatives in 2027

Mehmet ElmicenniReviewed by Mehmet Elmicenni, founder of Zekai•Prices checked •How we check

The short answer

The best ZeroGPT 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). ZeroGPT itself starts at $8.99/mo billed yearly. Zekai checked these prices on vendor pages on 13 Nov 2026; 9 more are compared below, including 3 with a free plan and 4 open source.

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Best overallSee in table →
Originality.ai logo

Originality.ai

$12.95/mo billed yearly · free plan

7.7
Best free planSee in table →
GPTZero logo

GPTZero

$12.99/mo billed yearly · free plan

6.3
Best open sourceSee in table →
SlopTotal logo

SlopTotal

Free to self-host · MIT

6.9
12alternatives compared
5with a free plan
5open source
$8/mo billed yearlycheapest paid · Isgen
$8.99/mo billed yearlyZeroGPT starts at
01 · Zekai Price Ledger

Which ZeroGPT alternatives are worth it in 2027?

The AI detectors most often weighed against ZeroGPT are Originality.ai for bulk publisher checks, GPTZero for sentence highlights and model detection, Winston AI for text plus image detection, Copyleaks for credit-based plagiarism checks, and Quetext. Isgen is the cheapest paid option listed here, at $8 a month billed yearly.

ToolTypeStarting priceFree plan limitBest forCost for your teamChecked
ZeroGPT logo
ZeroGPTThe tool you are replacing
 You are here
$8.99/mo billed yearlyPro, billed yearly ($14.99 billed monthly)
 15,000 characters per AI detection Quick free AI text checks with batch upload — 11 Nov 2026 Pricing ↗
Originality.ai logo
Originality.ai Zekai score 7.7Best overall
 Free plan + paid
$12.95/mo billed yearlyPro, billed yearly
 10K words once (100 credits) Bulk content checks for publishers and agencies — 11 Nov 2026 Pricing ↗
GPTZero logo
GPTZero Zekai score 6.3Best free plan
 Free plan + paid
$12.99/mo billed yearlyPremium, billed yearly
 10,000 words per month, 1 advanced scan Teachers wanting sentence highlights and model detection — 11 Nov 2026 Pricing ↗
Winston AI logo
Winston AI Zekai score 7.7
 Free plan + paid
$10/mo billed yearlyEssential, billed yearly (list price; WINSTON50 coupon not applied)
 2,000 credits, 14-day trial Detecting AI text, images and deepfakes together — 11 Nov 2026 Pricing ↗
Copyleaks logo
Copyleaks Zekai score 6.6
$13.99/mo billed yearlyPersonal, billed yearly ($16.99 billed monthly)
 No free plan Plagiarism plus AI checks bought by credit — 11 Nov 2026 Pricing ↗
Quetext logo
Quetext Zekai score 7.6
 Free plan + paid
$14.99/moEssential, price as displayed on pricing page
 Up to 1,000 words for the AI detector Plagiarism checker and AI detector bundle — 11 Nov 2026 Pricing ↗
Isgen Zekai score 7.3Cheapest paid
$8/mo billed yearlyAcademic, billed yearly
 No free plan Low-cost academic detector with plagiarism check — 11 Nov 2026 Pricing ↗
Sapling logo
Sapling Zekai score 7.5
 Free plan + paid
$25/moPro, price as displayed on pricing page
 2,000 characters per check AI detector inside a writing-suggestions tool — 11 Nov 2026 Pricing ↗
SlopTotal logo
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 logo
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 logo
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 logo
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 logo
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 ↗

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 ZeroGPT?

Yes. ZeroGPT lists a free plan at $0 forever with no credit card needed, which allows up to 15,000 characters per AI detection and no batch files. Pro, at $8.99 a month billed yearly, raises that to 100,000 characters per detection and 50 batch files and removes ads.

Source: ZeroGPT pricing page, read 11 Nov 2026.

Free$0

15,000 characters per AI detection

Paid from$8.99/mo billed yearly

Pro, billed yearly ($14.99 billed monthly)

03 · Free alternatives

What are the best free ZeroGPT alternatives?

GPTZero has the most generous recurring free plan among the alternatives read here: 10,000 words a month and one advanced scan. Quetext allows 1,000 words per AI check, Sapling 2,000 characters per check, Winston AI 2,000 credits over a 14-day trial, and Originality.ai a one-time 10K words.

Originality.ai logo

Originality.ai

Best overallFree plan + paid
10K words once (100 credits)
Paid from $12.95/mo billed yearly
vs ZeroGPT →Zekai review
GPTZero logo

GPTZero

Best free planFree plan + paid
10,000 words per month, 1 advanced scan
Paid from $12.99/mo billed yearly
vs ZeroGPT →Zekai review
Winston AI logo

Winston AI

Free plan + paid
2,000 credits, 14-day trial
Paid from $10/mo billed yearly
vs ZeroGPT →Zekai review
Quetext logo

Quetext

Free plan + paid
Up to 1,000 words for the AI detector
Paid from $14.99/mo
vs ZeroGPT →Zekai review
Sapling logo

Sapling

Free plan + paid
2,000 characters per check
Paid from $25/mo
vs ZeroGPT →Zekai review
04 · Open source

What are the best open-source ZeroGPT alternatives?

Open-source AI text detectors are few and mostly research code. SlopTotal (MIT) is the one with a web page: it runs 23 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; SynthID Text (Apache-2.0) detects only its own watermark.

SlopTotal logo

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 pageSource code ↗Managed hosting slot
Binoculars logo

Binoculars

BSD-3-Clause★ 435 GitHub stars · 13 Nov 2026
To self-host: The repo states Python 3.9 and pip install -e .; default scoring uses the Falcon-7B and Falcon-7B-Instruct models, so both 7B models must be downloaded. No GPU requirement is stated.
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 pageSource code ↗Managed hosting slot
Fast-DetectGPT logo

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 pageSource code ↗Managed hosting slot
Open Detector logo

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 pageSource code ↗Managed hosting slot
SynthID Text logo

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 pageSource code ↗Managed hosting slot
05 · Side by side

How does ZeroGPT compare with each alternative?

Against ZeroGPT, GPTZero adds model-family and mixed-text detection, Originality.ai adds scan history and team seats, Winston AI adds image and deepfake detection, Copyleaks drops the free tier for credits, Quetext bundles plagiarism checks, Isgen costs less, and Sapling embeds detection in a writing assistant.

01
Originality.ai logo

ZeroGPT vs Originality.ai

Best overallFree plan + paid$12.95/mo billed yearly · checked 11 Nov 20267.7
The differencePro gives 200K words (2K credits) a month with 30-day scan history, bulk scan, PDF download and extra team seats; its free plan is a one-time 10K-word allowance, not a monthly quota.
Switch to Originality.ai ifyou check freelancer or agency content in bulk and want scan history, shareable reports and team seats
Stay with ZeroGPT ifyou only paste short texts now and then and want a free tier that resets every month
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.aiRead the Zekai reviewPrice alert
02
GPTZero logo

ZeroGPT vs GPTZero

Best free planFree plan + paid$12.99/mo billed yearly · checked 11 Nov 20266.3
The differenceFree plan allows 10,000 words a month; Premium lists multi-model detection (Gemini, Claude, LLaMa), mixed AI and human text detection and paraphraser or bypasser detection, with 300,000 words a month.
Switch to GPTZero ifyou want a free monthly word quota and detection that names which AI model family likely wrote the text
Stay with ZeroGPT ifyou need the pro plan's plagiarism, video detection and WhatsApp or Telegram access in one login
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 GPTZeroRead the Zekai reviewPrice alert
03
Winston AI logo

ZeroGPT vs Winston AI

Free plan + paid$10/mo billed yearly · checked 11 Nov 20267.7
The differenceCredit-based: Essential gives 100,000 credits a month and covers AI image and deepfake detection, OCR for pictures and handwriting, plagiarism checks and shareable PDF reports.
Switch to Winston AI ifyou also need to screen images, deepfakes or scanned handwriting, not only typed text
Stay with ZeroGPT ifyou want one flat sign-up with a perpetual free tier and no credit counting
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 AIRead the Zekai reviewPrice alert
04
Copyleaks logo

ZeroGPT vs Copyleaks

$13.99/mo billed yearly · checked 11 Nov 20266.6
The differenceSells by credit: Personal is $13.99 a month billed yearly and Pro $74.99 billed yearly; the pricing page lists no free plan, and its FAQ says one credit covers up to 250 words.
Switch to Copyleaks ifyou accept paying from the first scan in exchange for plagiarism and AI checks sold by credit
Stay with ZeroGPT ifyou rely on ZeroGPT's no-sign-up free checker for casual spot checks
Pros
  • Combines AI detection and traditional plagiarism checking in one tool.
  • Provides specific model detection (e.g., GPT-3.5, GPT-4).
Cons
  • AI detection is probabilistic and can produce false positives on human writing.
  • False positives are more common for people writing in a second language.

Pros and cons from the Zekai review of Copyleaks · Verdict: Dual-purpose checker

Visit CopyleaksRead the Zekai reviewPrice alert
05
Quetext logo

ZeroGPT vs Quetext

Free plan + paid$14.99/mo · checked 11 Nov 20267.6
The differenceEssential bundles a DeepSearch plagiarism checker and AI detector on one 100k-words-a-month allowance, plus a humanizer and summarizer; the free plan limits its detector to 1,000 words.
Switch to Quetext ifyou want plagiarism and AI checks under one shared monthly word allowance
Stay with ZeroGPT ifyou need longer free scans, since the free detector there stops at 1,000 words
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 QuetextRead the Zekai reviewPrice alert
06

ZeroGPT vs Isgen

Cheapest paid$8/mo billed yearly · checked 11 Nov 20267.3
The differenceAcademic plan is $8 a month billed yearly for 350,000 detection words a month, phrase-level analysis, a plagiarism checker, batch upload and 15 days of document history.
Switch to Isgen ifyou want a paid detector priced a little under ZeroGPT Pro with phrase-level analysis and history
Stay with ZeroGPT ifyou want the free tier and the ad-free, 100,000-character Pro scans already in one tool
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 IsgenRead the Zekai reviewPrice alert
07
Sapling logo

ZeroGPT vs Sapling

Free plan + paid$25/mo · checked 11 Nov 20267.5
The differenceFree detector checks stop at 2,000 characters; Pro raises that to 100,000 characters and 10 files per batch, and bundles writing suggestions with a usage-billed API for developers.
Switch to Sapling ifyou want AI detection inside a writing assistant, or need a usage-billed detection API
Stay with ZeroGPT ifyou paste long documents and want a free tier that allows far more per check
Pros
  • Free plan available for web-based use
  • Simple copy-and-paste interface requires no setup
Cons
  • Results are probabilistic and can be inaccurate; not definitive proof.
  • Risk of false positives, flagging genuine human writing as AI-generated.

Pros and cons from the Zekai review of Sapling · Verdict: A starting point, not proof.

Visit SaplingRead the Zekai reviewPrice alert
08
SlopTotal logo

ZeroGPT 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 scan confidential documents and need the text to stay on your own machine
Stay with ZeroGPT ifyou scan essays by non-native English writers, which its README says are still flagged
Visit SlopTotalRead the Zekai reviewPrice alert
09
Binoculars logo

ZeroGPT vs Binoculars

Open sourceFree (self-hosted)3.5
The differenceZero-shot detector, no training data needed; the repo states it scores text with two Falcon-7B models and lets you pass other scoring models to the Binoculars class.
Switch to Binoculars ifyou want to run detection locally on your own text and swap in other scoring models
Stay with ZeroGPT ifyou want a web page that returns a percentage and highlighted sentences without installing models
Visit BinocularsRead the Zekai reviewPrice alert
10
Fast-DetectGPT logo

ZeroGPT 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 to read the detection code and choose which scoring model it uses
Stay with ZeroGPT ifyou want a vendor to maintain the models as new chatbots appear
Visit Fast-DetectGPTRead the Zekai reviewPrice alert
11
Open Detector logo

ZeroGPT 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 want a model on Hugging Face that you can fine-tune or inspect
Stay with ZeroGPT ifyou need an independent accuracy record, not figures the authors report
Visit Open DetectorRead the Zekai reviewPrice alert
12
SynthID Text logo

ZeroGPT 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 control the text generator and want origin checks tied to a secret key
Stay with ZeroGPT ifyou want a detector for any pasted text rather than watermark verification
Visit SynthID TextRead the Zekai reviewPrice alert
06 · What changed

Why do people leave ZeroGPT?

  • The free plan caps each AI detection at 15,000 characters and allows 0 batch files; Pro lifts the cap to 100,000 characters and 50 batch files. (source)

  • Pro costs $14.99 a month when billed monthly versus $8.99 a month billed yearly, and the 750-word plagiarism check on Pro is one-time only. (source)

08 · FAQ

Questions people ask about ZeroGPT alternatives

What is the best alternative to ZeroGPT in 2027?

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

Is there a free version of ZeroGPT?

Yes. ZeroGPT has a free plan: 15,000 characters per AI detection. Paid plans start at $8.99/mo billed yearly, checked on 11 Nov 2026.

Is there a 100% free alternative to ZeroGPT?

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

What is cheaper than ZeroGPT?

Isgen starts at $8/mo billed yearly, against $8.99/mo billed yearly for ZeroGPT, as listed on each vendor's pricing page on 11 Nov 2026.

How much do ZeroGPT 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, Winston AI $50/mo, Originality.ai $64.75/mo, against ZeroGPT $44.95/mo for ZeroGPT. 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 ZeroGPT?

Pro gives 200K words (2K credits) a month with 30-day scan history, bulk scan, PDF download and extra team seats; its free plan is a one-time 10K-word allowance, not a monthly quota. Choose Originality.ai if you check freelancer or agency content in bulk and want scan history, shareable reports and team seats. Stay with ZeroGPT if you only paste short texts now and then and want a free tier that resets every month.

Why are people leaving ZeroGPT?

The documented reasons are: The free plan caps each AI detection at 15,000 characters and allows 0 batch files; Pro lifts the cap to 100,000 characters and 50 batch files (11 Nov 2026); Pro costs $14.99 a month when billed monthly versus $8.99 a month billed yearly, and the 750-word plagiarism check on Pro is one-time only (11 Nov 2026). Each is sourced in the section above.

What is better than ZeroGPT?

It depends on the job: GPTZero adds sentence highlighting and model detection, Originality.ai suits bulk publisher checks, and Winston AI also screens images. Compare them in the table above.

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 ZeroGPT are listed, and sponsors never change the order or the scores.

Mehmet Elmicenni, founder of Zekai
Mehmet Elmicenni

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

About the founder · How Zekai scores tools

JSON copyMarkdown copy
1 · Same job onlyEvery alternative does the same task as ZeroGPT; 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

  • Page rebuilt on v6; all prices re-read on vendor pages.

  • Open-source options expanded; each now shows licence, commercial use, hardware and setup.

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