kitio.aiGPTZero vs Slop or Not
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Slop or Not is completely free, while GPTZero is freemium.
At a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- AI probability score
- Sentence highlighting
- Writing replay in Google Docs
- Plagiarism checker
- API
- AI text detection
- AI image detection
- Watermark and C2PA checks
- On-device detection apps
- CLI and MCP server
| Feature | GPTZero | Slop or Not |
|---|---|---|
| Best for | AI detector that flags machine-written text for teachers and editors | Free detector for AI-written text and AI-generated images |
| Category | Writing | Writing |
| Pricing model | Freemium | Free |
| Starting price | See pricing page | Free |
| Free plan | Yes | Yes, fully free |
| Made by | GPTZero | Slop or Not |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Slop or Not is completely free, while GPTZero is freemium.
Free plan
Cheapest paid plan
Top plan
Free trial
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
GPTZero
- Free tier for regular checks
- Writing replay shows the drafting process
- LMS integrations
- Scores are probabilities, not proof
- Can misjudge non-native English writing
Slop or Not
- Covers both text and images
- Private on-device checks on Apple
- No sign-up needed online
- Detectors can give false positives
- Apps limited to iPhone and Mac
- Edited or compressed images are harder to judge
Which one should you choose?
Choose GPTZero if you want:
- Free tier for regular checks
- Writing replay shows the drafting process
- LMS integrations
Watch out: scores are probabilities, not proof.
Choose Slop or Not if you want:
- Covers both text and images
- Private on-device checks on Apple
- No sign-up needed online
Watch out: detectors can give false positives.
GPTZero vs Slop or Not FAQ
What is the difference between GPTZero and Slop or Not?
GPTZero: AI detector that flags machine-written text for teachers and editors. Slop or Not: Free detector for AI-written text and AI-generated images. Both are writing tools.
Is GPTZero or Slop or Not cheaper?
Slop or Not is completely free, while GPTZero is freemium.
Do GPTZero and Slop or Not have free plans?
GPTZero: Yes. Slop or Not: Yes, fully free.
Who makes GPTZero?
GPTZero is made by GPTZero, based in United States.
Who makes Slop or Not?
Slop or Not is made by Slop or Not.
Which should I choose, GPTZero or Slop or Not?
Choose GPTZero if you value free tier for regular checks and writing replay shows the drafting process. Choose Slop or Not if you value covers both text and images and private on-device checks on apple.