# ZeroGPT Alternatives 2027: 12 Paid, Free & Open-Source

Source: https://zekaiwork.com/alternatives/zerogpt/
Prices checked: 2026-11-13 (Zekai Price Ledger)

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.

| Tool | Type | Starting price | Free plan limit | Licence | Best for | Price checked | Links |
|---|---|---|---|---|---|---|---|
| ZeroGPT (the tool being replaced) | — | $8.99/mo billed yearly | 15,000 characters per AI detection | — | — | 2026-11-11 | [pricing](https://www.zerogpt.com/pricing) |
| Originality.ai | Free plan + paid | $12.95/mo billed yearly | 10K words once (100 credits) | — | Bulk content checks for publishers and agencies | 2026-11-11 | [site](https://originality.ai) [pricing](https://originality.ai/pricing) [Zekai page](https://zekaiwork.com/ai-tools/originality-ai/) |
| GPTZero | Free plan + paid | $12.99/mo billed yearly | 10,000 words per month, 1 advanced scan | — | Teachers wanting sentence highlights and model detection | 2026-11-11 | [site](https://gptzero.me) [pricing](https://gptzero.me/pricing) [Zekai page](https://zekaiwork.com/ai-tools/gptzero/) |
| Winston AI | Free plan + paid | $10/mo billed yearly | 2,000 credits, 14-day trial | — | Detecting AI text, images and deepfakes together | 2026-11-11 | [site](https://gowinston.ai) [pricing](https://gowinston.ai/pricing/) [Zekai page](https://zekaiwork.com/ai-tools/winston-ai/) |
| Copyleaks | Paid | $13.99/mo billed yearly | No free plan | — | Plagiarism plus AI checks bought by credit | 2026-11-11 | [site](https://copyleaks.com) [pricing](https://copyleaks.com/pricing) [Zekai page](https://zekaiwork.com/ai-tools/copyleaks/) |
| Quetext | Free plan + paid | $14.99/mo | Up to 1,000 words for the AI detector | — | Plagiarism checker and AI detector bundle | 2026-11-11 | [site](https://www.quetext.com) [pricing](https://www.quetext.com/pricing) [Zekai page](https://zekaiwork.com/ai-tools/quetext/) |
| Isgen | Paid | $8/mo billed yearly | No free plan | — | Low-cost academic detector with plagiarism check | 2026-11-11 | [site](https://isgen.ai) [pricing](https://isgen.ai/pricing) [Zekai page](https://zekaiwork.com/ai-tools/isgen/) |
| Sapling | Free plan + paid | $25/mo | 2,000 characters per check | — | AI detector inside a writing-suggestions tool | 2026-11-11 | [site](https://sapling.ai) [pricing](https://sapling.ai/pricing) [Zekai page](https://zekaiwork.com/ai-tools/sapling/) |
| SlopTotal | Open source | Free (self-hosted) | No limit (self-hosted) | MIT | Self-hosted multi-engine AI text detector | 2026-11-13 | [site](https://sloptotal.com) [code](https://github.com/pablocaeg/sloptotal) [Zekai page](https://zekaiwork.com/free-open-source/sloptotal/) |
| Binoculars | Open source | Free (self-hosted) | No limit (self-hosted) | BSD-3-Clause | Research-grade zero-shot detection you run yourself | 2026-11-13 | [site](https://github.com/ahans30/Binoculars) [code](https://github.com/ahans30/Binoculars) [Zekai page](https://zekaiwork.com/free-open-source/binoculars/) |
| Fast-DetectGPT | Open source | Free (self-hosted) | No limit (self-hosted) | MIT | Zero-shot detection from an ICLR 2024 paper | 2026-11-13 | [site](https://fastdetect.net/) [code](https://github.com/baoguangsheng/fast-detect-gpt) [Zekai page](https://zekaiwork.com/free-open-source/fast-detect-gpt/) |
| Open Detector | Open source | Free (self-hosted) | No limit (self-hosted) | MIT | Academic-paper AI detection with a small model | 2026-11-13 | [site](https://github.com/Imalwayshere/Open-Detector) [code](https://github.com/Imalwayshere/Open-Detector) [Zekai page](https://zekaiwork.com/free-open-source/open-detector/) |
| SynthID Text | Open source | Free (self-hosted) | No limit (self-hosted) | Apache-2.0 | Watermark detection for text you generate | 2026-11-13 | [site](https://github.com/google-deepmind/synthid-text) [code](https://github.com/google-deepmind/synthid-text) [Zekai page](https://zekaiwork.com/free-open-source/synthid-text/) |

## How each alternative compares with ZeroGPT

- **Originality.ai** (Free plan + paid, $12.95/mo billed yearly, checked 2026-11-11): 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. Switch 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.
- **GPTZero** (Free plan + paid, $12.99/mo billed yearly, checked 2026-11-11): Free 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 if you want a free monthly word quota and detection that names which AI model family likely wrote the text. Stay with ZeroGPT if you need the pro plan's plagiarism, video detection and WhatsApp or Telegram access in one login.
- **Winston AI** (Free plan + paid, $10/mo billed yearly, checked 2026-11-11): Credit-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 if you also need to screen images, deepfakes or scanned handwriting, not only typed text. Stay with ZeroGPT if you want one flat sign-up with a perpetual free tier and no credit counting.
- **Copyleaks** (Paid, $13.99/mo billed yearly, checked 2026-11-11): Sells 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 if you accept paying from the first scan in exchange for plagiarism and AI checks sold by credit. Stay with ZeroGPT if you rely on ZeroGPT's no-sign-up free checker for casual spot checks.
- **Quetext** (Free plan + paid, $14.99/mo, checked 2026-11-11): Essential 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 if you want plagiarism and AI checks under one shared monthly word allowance. Stay with ZeroGPT if you need longer free scans, since the free detector there stops at 1,000 words.
- **Isgen** (Paid, $8/mo billed yearly, checked 2026-11-11): Academic 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 if you want a paid detector priced a little under ZeroGPT Pro with phrase-level analysis and history. Stay with ZeroGPT if you want the free tier and the ad-free, 100,000-character Pro scans already in one tool.
- **Sapling** (Free plan + paid, $25/mo, checked 2026-11-11): Free 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 if you want AI detection inside a writing assistant, or need a usage-billed detection API. Stay with ZeroGPT if you paste long documents and want a free tier that allows far more per check.
- **SlopTotal** (Open source, Free (self-hosted)): Runs 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 if you scan confidential documents and need the text to stay on your own machine. Stay with ZeroGPT if you scan essays by non-native English writers, which its README says are still flagged.
- **Binoculars** (Open source, Free (self-hosted)): Zero-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 if you want to run detection locally on your own text and swap in other scoring models. Stay with ZeroGPT if you want a web page that returns a percentage and highlighted sentences without installing models.
- **Fast-DetectGPT** (Open source, Free (self-hosted)): ICLR 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 if you want to read the detection code and choose which scoring model it uses. Stay with ZeroGPT if you want a vendor to maintain the models as new chatbots appear.
- **Open Detector** (Open source, Free (self-hosted)): BERT-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 if you want a model on Hugging Face that you can fine-tune or inspect. Stay with ZeroGPT if you need an independent accuracy record, not figures the authors report.
- **SynthID Text** (Open source, Free (self-hosted)): Google 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 if you control the text generator and want origin checks tied to a secret key. Stay with ZeroGPT if you want a detector for any pasted text rather than watermark verification.

## Open-source options in detail

- **SlopTotal** (https://github.com/pablocaeg/sloptotal): Licence: MIT; 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: 2026-11-03; Last release: 2026-11-03; GitHub stars: 114 (2026-11-13)
- **Binoculars** (https://github.com/ahans30/Binoculars): Licence: BSD-3-Clause; 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: 2024-05-14; GitHub stars: 435 (2026-11-13)
- **Fast-DetectGPT** (https://github.com/baoguangsheng/fast-detect-gpt): Licence: MIT; 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: 2026-02-07; GitHub stars: 440 (2026-11-13)
- **Open Detector** (https://github.com/Imalwayshere/Open-Detector): Licence: MIT; 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: 2026-11-12; GitHub stars: 254 (2026-11-13)
- **SynthID Text** (https://github.com/google-deepmind/synthid-text): Licence: Apache-2.0; 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: 2026-10-26; GitHub stars: 1,300 (2026-11-13)

## Questions

### 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.

## Related on Zekai

- [GPTZero alternatives](https://zekaiwork.com/alternatives/gptzero/)
- [Winston AI alternatives](https://zekaiwork.com/alternatives/winston-ai/)
- [Copyleaks alternatives](https://zekaiwork.com/alternatives/copyleaks/)
- [Turnitin alternatives](https://zekaiwork.com/alternatives/turnitin/)
- [AI for Education & E-learning](https://zekaiwork.com/professions/ai-education-elearning-teaching-tools/)

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Live table, team cost finder and price alerts: https://zekaiwork.com/alternatives/zerogpt/